{"id":652,"date":"2026-10-02T13:17:40","date_gmt":"2026-10-02T11:17:40","guid":{"rendered":"https:\/\/www.valfonta.com\/producto\/c1-gas-control-valve\/"},"modified":"2026-10-22T09:22:54","modified_gmt":"2026-10-22T07:22:54","slug":"c1-gas-control-valve","status":"publish","type":"product","link":"https:\/\/www.valfonta.com\/en\/product\/c1-gas-control-valve\/","title":{"rendered":"C1 control valve with pneumatic actuator"},"content":{"rendered":"<div class=\"wp-block-group vf-raiz vf-pl-ficha-producto is-layout-flow wp-block-group-is-layout-flow\"><nav class=\"wp-block-group vf-breadcrumbs vfa-aria-label--Breadcrumbs is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a href=\"\/en\/\">Home<\/a><span aria-hidden=\"true\" class=\"vf-sep\">\u203a<\/span><a href=\"https:\/\/www.valfonta.com\/en\/control-valve\/\">Control valves<\/a><span aria-hidden=\"true\" class=\"vf-sep\">\u203a<\/span><span aria-current=\"page\">C1 control valve with pneumatic actuator<\/span><\/p><\/nav><article class=\"wp-block-group vf-pdp vfd-model--C1 is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-pdp-hero is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-pdp-title is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-pdp-eyebrow wp-block-paragraph\">Control valve \u00b7 Pneumatic actuator<\/p><h1 class=\"wp-block-heading\">C1 control valve with pneumatic actuator<\/h1><\/div><div class=\"wp-block-group vf-pdp-media is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><span class=\"vf-pdp-badge\">Modulating or ON\/OFF<\/span><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-C1-PROVISIONAL-700x700-1.jpg\" alt=\"C1 control valve with flanged globe body and pneumatic diaphragm actuator\" class=\"wp-image-183\" width=\"700\" height=\"700\" fetchpriority=\"high\"><\/p><\/div><div class=\"wp-block-group vf-pdp-body is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-lead wp-block-paragraph\">Single-seat, top-entry globe control valve operated by a multi-spring pneumatic diaphragm actuator. It regulates gases, vapors, and liquids in modulating or ON\/OFF service, from DN15 to DN100 and up to PN40.<\/p><ul class=\"vf-pdp-keys wp-block-list\"><li><span>Sizes<\/span><b>DN15 to DN100 <small>DN125 and DN150 on request<\/small><\/b><\/li><li><span>Pressure rating<\/span><b>PN25 bronze \u00b7 PN40 steel<\/b><\/li><li><span>Standard Kv<\/span><b>3.5 to 130 m\u00b3\/h<\/b><\/li><li><span>Characteristic<\/span><b>Equal-percentage, linear, or ON\/OFF<\/b><\/li><li><span>Temperature<\/span><b>\u22125 to +200 \u00b0C <small>up to 350 \u00b0C depending on bonnet and packing<\/small><\/b><\/li><li><span>Control air<\/span><b>up to 4 barg<\/b><\/li><\/ul><div class=\"wp-block-group vf-pdp-cta is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a class=\"vf-btn vf-btn--pri\" href=\"#solicitar\">Request a quote<\/a><a class=\"vf-btn vf-btn--sec\" href=\"\/wp-content\/uploads\/2026\/10\/C1-19A-ESP.pdf\" rel=\"noopener\" target=\"_blank\">Download datasheet <small>PDF<\/small><\/a><\/p><\/div><p class=\"vf-pdp-contact wp-block-paragraph\">Questions about selecting the Kv or the actuator? Call <a href=\"tel:+34933720888\">933 720 888<\/a> or email <a href=\"mailto:valfonta@valfonta.com\">valfonta@valfonta.com<\/a>.<\/p><\/div><\/div><ul class=\"vf-pdp-trust wp-block-list\"><li>In-house design and manufacturing in Badalona<\/li><li>ISO 9001 certified quality system<\/li><li>Version with ATEX II 2 GD marking<\/li><li>Actuator factory-calibrated to your data<\/li><\/ul><nav class=\"wp-block-group vf-pdp-nav vfa-aria-label--Datasheet%20contents is-layout-flow wp-block-group-is-layout-flow\"><ul class=\"wp-block-list\"><li><a href=\"#aplicaciones\">Applications<\/a><\/li><li><a href=\"#especificaciones\">Specifications<\/a><\/li><li><a href=\"#funcionamiento\">Operation<\/a><\/li><li><a href=\"#instalacion\">Installation<\/a><\/li><li><a href=\"#documentacion\">Documentation<\/a><\/li><li><a href=\"#comparar\">Compare<\/a><\/li><li><a href=\"#preguntas\">FAQ<\/a><\/li><li><a href=\"#solicitar\">Request a quote<\/a><\/li><\/ul><\/nav><section id=\"aplicaciones\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-pdp-two is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">What the C1 is used for<\/h2><p class=\"wp-block-paragraph\">The <strong>C1<\/strong> is a <a href=\"https:\/\/www.valfonta.com\/en\/control-valve\/\">control valve<\/a>: the plug changes position according to the air signal the actuator receives from the control system. It requires instrument air and a control signal, and in return it is operated from the process control system, in continuous or on\/off control.<\/p><p class=\"wp-block-paragraph\">Its <strong>modular design<\/strong> combines plugs, bonnets, packings, leakage classes, and four actuator sizes. Learn more about the <a href=\"https:\/\/www.valfonta.com\/en\/blog\/control-valve-types-and-recommendations\/\">types of control valves<\/a> and Valfonta\u2019s <a href=\"https:\/\/www.valfonta.com\/en\/control-valve-design\/\">control valve design<\/a>.<\/p><ul class=\"vf-pdp-apps wp-block-list\"><li><b>Modulating control<\/b><span>Equal-percentage or linear plug, positioned according to the process signal.<\/span><\/li><li><b>ON\/OFF service<\/b><span>ON\/OFF plug for full opening and closing.<\/span><\/li><li><b>Steam and high temperature<\/b><span>Finned bonnet for over 200 \u00b0C and graphite packing up to 350 \u00b0C.<\/span><\/li><li><b>Low temperature<\/b><span>Extended bonnet for fluids below \u22125 \u00b0C.<\/span><\/li><li><b>Explosive atmospheres<\/b><span>ATEX II 2 GD version and 4\u201320 mA electro-pneumatic positioner (Ex).<\/span><\/li><\/ul><\/div><aside class=\"wp-block-group vf-pdp-fit is-layout-flow wp-block-group-is-layout-flow\"><h3 class=\"wp-block-heading\">Choose the C1 if\u2026<\/h3><ul class=\"vf-si wp-block-list\"><li>The valve must be operated by an external signal, either pneumatic or 4\u201320 mA with a positioner.<\/li><li>You work with gases, vapors, or liquids, from DN15 to DN100 and up to PN40.<\/li><li>You want a defined fail-safe position if the air supply fails (NC or NO).<\/li><li>You need Class VI leakage or temperatures up to 350 \u00b0C with the appropriate bonnet and packing.<\/li><\/ul><h3 class=\"wp-block-heading\">Choose another model if\u2026<\/h3><ul class=\"vf-no wp-block-list\"><li>You only need to reduce pressure and have no instrument air: the <a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valves-m1\/\">M1 reducing valve<\/a> (DN15\u2013150, steam up to 220 \u00b0C) requires no auxiliary power.<\/li><li>You need very low reduced pressures without an actuator: the <a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-m2\/\">M2<\/a> regulates from 0.02 barg.<\/li><li>You need to discharge excess pressure from a line: see the <a href=\"https:\/\/www.valfonta.com\/en\/pressure-relief-valve\/\">pressure relief valves<\/a>.<\/li><\/ul><\/aside><\/div><\/section><section id=\"especificaciones\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">C1 technical specifications<\/h2><div class=\"wp-block-group vf-tbl-wrap is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-table vf-tbl\"><table><tbody><tr><th scope=\"row\">Type<\/th><td>Globe, two-way, single seat, top entry, guided plug<\/td><\/tr><tr><th scope=\"row\">Connections<\/th><td>EN 1092-1 Type B1 flanges \u00b7 ANSI 150\/300 \u00b7 On request: BSP or NPT thread, BW or SW<\/td><\/tr><tr><th scope=\"row\">Body and pressure rating<\/th><td>PN25: RG-10 bronze (EN 1982 CuSn10-CC480K) \u00b7 PN40: GP240GH \/ A216 WCB (1.0619) carbon steel \u00b7 PN40: CF3M (1.4408) stainless steel<\/td><\/tr><tr><th scope=\"row\">Fluids<\/th><td>Gases, vapors, and liquids<\/td><\/tr><tr><th scope=\"row\">Flow characteristic<\/th><td>Equal-percentage, linear, or ON\/OFF<\/td><\/tr><tr><th scope=\"row\">Kv coefficient<\/th><td>3.5 (DN15) to 130 m\u00b3\/h (DN100). Reduced Kv and bore on request<\/td><\/tr><tr><th scope=\"row\">Leakage class<\/th><td>Class IV (metal-to-metal) \u00b7 Class VI (PTFE+graphite plug). On request: PEEK, NBR, EPDM, stellited seat<\/td><\/tr><tr><th scope=\"row\">Bonnet<\/th><td>Standard: \u22125 to +200 \u00b0C \u00b7 Finned: over +200 \u00b0C \u00b7 Extended: below \u22125 \u00b0C \u00b7 With bellows: on request<\/td><\/tr><tr><th scope=\"row\">Stem sealing<\/th><td>Standard: double PTFE+graphite V-ring, up to +200 \u00b0C \u00b7 PTFE: up to +150 \u00b0C \u00b7 Graphite: up to +350 \u00b0C \u00b7 Bellows: on request<\/td><\/tr><tr><th scope=\"row\">Actuator<\/th><td>Multi-spring diaphragm, reversible in-line: HF.205, HF.275, HF.360, and HF.430 (10 to 25 kg). Steel 1.0335 with epoxy paint and fabric-reinforced EPDM diaphragm<\/td><\/tr><tr><th scope=\"row\">Control air<\/th><td>Up to 4 barg, \u00bc\u2033 BSP female connection, dry air free of oil and water<\/td><\/tr><tr><th scope=\"row\">Control signals<\/th><td>0.2\u20131 \u00b7 0.4\u20131.2 \u00b7 0.4\u20132 \u00b7 1.5\u20133.2 bar, depending on actuator<\/td><\/tr><tr><th scope=\"row\">Fail-safe position<\/th><td>Normally closed or normally open<\/td><\/tr><tr><th scope=\"row\">Options<\/th><td>Electro-pneumatic positioner (Ex) 4\u201320 mA or smart positioner, filter regulator, handwheel, solenoid valve, alarm contacts, stainless steel construction, anti-cavitation and low-noise cage. NAMUR mounting (IEC 534-6)<\/td><\/tr><tr><th scope=\"row\">Pressure equipment<\/th><td>The nameplate indicates whether it carries CE marking under PED 2014\/68\/EU. Declaration of conformity on request<\/td><\/tr><tr><th scope=\"row\">ATEX<\/th><td>II 2 GD c IIC Tx \/ c IIIC Tx\u00baC \u00b7 certificate LOM 14.034 U<\/td><\/tr><\/tbody><\/table><\/figure><\/div><h3 class=\"wp-block-heading\">Dimensions, weight, and Kv<\/h3><div class=\"wp-block-group vf-tbl-wrap is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-table vf-tbl vf-tbl--grid\"><table><thead><tr><th scope=\"col\"><\/th><th scope=\"col\">DN15<\/th><th scope=\"col\">DN20<\/th><th scope=\"col\">DN25<\/th><th scope=\"col\">DN32<\/th><th scope=\"col\">DN40<\/th><th scope=\"col\">DN50<\/th><th scope=\"col\">DN65<\/th><th scope=\"col\">DN80<\/th><th scope=\"col\">DN100<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">Kv (m\u00b3\/h)<\/th><td>3,5<\/td><td>5<\/td><td>9<\/td><td>15<\/td><td>22<\/td><td>35<\/td><td>60<\/td><td>85<\/td><td>130<\/td><\/tr><tr><th scope=\"row\">Cv (gpm)<\/th><td>4<\/td><td>5,8<\/td><td>10,4<\/td><td>17,5<\/td><td>25<\/td><td>41<\/td><td>70<\/td><td>100<\/td><td>152<\/td><\/tr><tr><th scope=\"row\">Stroke (mm)<\/th><td>20<\/td><td>20<\/td><td>20<\/td><td>20<\/td><td>20<\/td><td>20<\/td><td>30<\/td><td>30<\/td><td>30<\/td><\/tr><tr><th scope=\"row\">Length A (EN 558-1)<\/th><td>130<\/td><td>150<\/td><td>160<\/td><td>180<\/td><td>200<\/td><td>230<\/td><td>290<\/td><td>310<\/td><td>350<\/td><\/tr><tr><th scope=\"row\">Length A (ANSI 150)<\/th><td>\u25cb<\/td><td>\u25cb<\/td><td>184<\/td><td>\u2013<\/td><td>222<\/td><td>254<\/td><td>276<\/td><td>298,5<\/td><td>352,5<\/td><\/tr><tr><th scope=\"row\">Length A (ANSI 300)<\/th><td>\u25cb<\/td><td>\u25cb<\/td><td>197<\/td><td>\u2013<\/td><td>235<\/td><td>267<\/td><td>292<\/td><td>317,5<\/td><td>\u2013<\/td><\/tr><tr><th scope=\"row\">Height L with HF.275<\/th><td>330<\/td><td>330<\/td><td>395<\/td><td>395<\/td><td>420<\/td><td>420<\/td><td>455<\/td><td>455<\/td><td>475<\/td><\/tr><tr><th scope=\"row\">Height L with HF.430<\/th><td>360<\/td><td>360<\/td><td>425<\/td><td>425<\/td><td>450<\/td><td>450<\/td><td>485<\/td><td>485<\/td><td>505<\/td><\/tr><tr><th scope=\"row\">Weight without actuator (kg)<\/th><td>5<\/td><td>6<\/td><td>7<\/td><td>8<\/td><td>12<\/td><td>15<\/td><td>20<\/td><td>25<\/td><td>40<\/td><\/tr><\/tbody><\/table><\/figure><\/div><p class=\"vf-note wp-block-paragraph\">Dimensions in mm. \u25cb on request \u00b7 \u2013 not available. Dimensioned drawings in the PDF datasheet.<\/p><h3 class=\"wp-block-heading\">Available Kv by size (m\u00b3\/h)<\/h3><div class=\"wp-block-group vf-tbl-wrap is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-table vf-tbl vf-tbl--grid\"><table><thead><tr><th scope=\"col\">Size<\/th><th scope=\"col\">Standard Kv<\/th><th scope=\"col\">Kv on request<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">DN15<\/th><td>3,5<\/td><td>0.1 to 2<\/td><\/tr><tr><th scope=\"row\">DN20<\/th><td>5<\/td><td>0.1 to 2 \u00b7 3.5<\/td><\/tr><tr><th scope=\"row\">DN25<\/th><td>9<\/td><td>0.1 to 2 \u00b7 3.5 \u00b7 5<\/td><\/tr><tr><th scope=\"row\">DN32<\/th><td>15<\/td><td>3,5 \u00b7 5 \u00b7 9<\/td><\/tr><tr><th scope=\"row\">DN40<\/th><td>22<\/td><td>3,5 \u00b7 5 \u00b7 9 \u00b7 15<\/td><\/tr><tr><th scope=\"row\">DN50<\/th><td>35<\/td><td>9 \u00b7 15 \u00b7 22<\/td><\/tr><tr><th scope=\"row\">DN65<\/th><td>60<\/td><td>15 \u00b7 22 \u00b7 35<\/td><\/tr><tr><th scope=\"row\">DN80<\/th><td>85<\/td><td>22 \u00b7 35 \u00b7 60<\/td><\/tr><tr><th scope=\"row\">DN100<\/th><td>130<\/td><td>35 \u00b7 60 \u00b7 85<\/td><\/tr><tr><th scope=\"row\">DN125<\/th><td>\u2013<\/td><td>60 \u00b7 85 \u00b7 130 \u00b7 200<\/td><\/tr><tr><th scope=\"row\">DN150<\/th><td>\u2013<\/td><td>85 \u00b7 130 \u00b7 200 \u00b7 260<\/td><\/tr><\/tbody><\/table><\/figure><\/div><h3 class=\"wp-block-heading\">Maximum working pressure by temperature (bar) \u00b7 EN 12516-1 and EN 1092-2<\/h3><div class=\"wp-block-group vf-tbl-wrap is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-table vf-tbl vf-tbl--grid\"><table><thead><tr><th scope=\"col\">Body (PN40 \u00b7 Class 300)<\/th><th scope=\"col\">\u221210 \u00b0C<\/th><th scope=\"col\">50 \u00b0C<\/th><th scope=\"col\">100 \u00b0C<\/th><th scope=\"col\">150 \u00b0C<\/th><th scope=\"col\">200 \u00b0C<\/th><th scope=\"col\">250 \u00b0C<\/th><th scope=\"col\">300 \u00b0C<\/th><th scope=\"col\">350 \u00b0C<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">A216 WCB (1.0619) carbon steel<\/th><td>40<\/td><td>40<\/td><td>36<\/td><td>35<\/td><td>34<\/td><td>33<\/td><td>30<\/td><td>29<\/td><\/tr><tr><th scope=\"row\">CF3M (1.4408) stainless steel<\/th><td>40<\/td><td>38<\/td><td>33<\/td><td>30<\/td><td>28<\/td><td>26<\/td><td>25<\/td><td>24<\/td><\/tr><\/tbody><\/table><\/figure><\/div><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Exploded view and materials (20 parts)<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-tbl-wrap is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-table vf-tbl vf-tbl--grid\"><table><thead><tr><th scope=\"col\">No.<\/th><th scope=\"col\">Part<\/th><th scope=\"col\">Material<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\">1<\/th><td>Body<\/td><td>RG10 bronze \u00b7 WCB steel \u00b7 CF3M stainless<\/td><\/tr><tr><th scope=\"row\">2<\/th><td>Seat<\/td><td>316L stainless<\/td><\/tr><tr><th scope=\"row\">3<\/th><td>Guide<\/td><td>316L stainless<\/td><\/tr><tr><th scope=\"row\">4<\/th><td>Seat (spare part)<\/td><td>PTFE+graphite \u00b7 SS316L \u00b7 on request<\/td><\/tr><tr><th scope=\"row\">5<\/th><td>Seat holder<\/td><td>316L stainless<\/td><\/tr><tr><th scope=\"row\">6<\/th><td>Pin<\/td><td>316L stainless<\/td><\/tr><tr><th scope=\"row\">7<\/th><td>Hex screw<\/td><td>8.8 or A-2<\/td><\/tr><tr><th scope=\"row\">8<\/th><td>Stem<\/td><td>316L stainless<\/td><\/tr><tr><th scope=\"row\">9<\/th><td>Packing (spare part)<\/td><td>See stem sealing table<\/td><\/tr><tr><th scope=\"row\">10<\/th><td>O-ring (spare part)<\/td><td>Viton<\/td><\/tr><tr><th scope=\"row\">11<\/th><td>Locknut<\/td><td>A2-70 stainless<\/td><\/tr><tr><th scope=\"row\">12<\/th><td>Packing nut<\/td><td>316L stainless<\/td><\/tr><tr><th scope=\"row\">13<\/th><td>Actuator assembly nut<\/td><td>Galv. steel 1.1191<\/td><\/tr><tr><th scope=\"row\">14<\/th><td>Bonnet<\/td><td>Galv. steel 1.1191 or 316 stainless, depending on bonnet<\/td><\/tr><tr><th scope=\"row\">15<\/th><td>Washer<\/td><td>8.8 or A-2<\/td><\/tr><tr><th scope=\"row\">16<\/th><td>Bonnet cover<\/td><td>Galv. steel 1.1191<\/td><\/tr><tr><th scope=\"row\">17<\/th><td>Stem<\/td><td>316L stainless<\/td><\/tr><tr><th scope=\"row\">18<\/th><td>Body gasket (spare part)<\/td><td>Graphite<\/td><\/tr><tr><th scope=\"row\">19<\/th><td>Guide<\/td><td>316L stainless + Ni<\/td><\/tr><tr><th scope=\"row\">20<\/th><td>Pin<\/td><td>316L stainless<\/td><\/tr><\/tbody><\/table><\/figure><\/div><\/div><\/details><\/section><section id=\"funcionamiento\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">How the C1 works<\/h2><p class=\"wp-block-paragraph\">The fluid flows through the valve in the direction of the arrow on the body, and the plug position depends on the pressure signal reaching the actuator diaphragm.<\/p><ol class=\"vf-steps wp-block-list\"><li><b>Control signal.<\/b> The control air pushes on the diaphragm and overcomes the spring force.<\/li><li><b>Plug movement.<\/b> The actuator stem drives the valve stem, and the plug moves toward or away from the seat.<\/li><li><b>Regulation.<\/b> With an equal-percentage or linear plug, the valve modulates according to the signal; with an ON\/OFF plug it works in on\/off mode.<\/li><li><b>Fail-safe position.<\/b> If the signal or the air supply fails, the springs close the valve (normally closed) or open it (normally open).<\/li><li><b>Action reversal.<\/b> The actuator can be switched quickly from direct to reverse action, in-line.<\/li><\/ol><\/section><section id=\"instalacion\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">C1 installation<\/h2><p class=\"wp-block-paragraph\">The manual recommends a bypass with a manual valve so the process can still be controlled by hand while the C1 is isolated for maintenance.<\/p><h3 class=\"wp-block-heading\">Installation and start-up<\/h3><ol class=\"vf-steps wp-block-list\"><li><b>Install isolation valves<\/b> at the inlet and outlet, a strainer upstream, and a manual bypass valve. Never exceed the pressure or temperature in the specifications.<\/li><li><b>Leave 6 \u00d7 DN clear<\/b> of obstructions upstream and downstream of the valve, avoid stress and vibration, and leave room to remove the actuator.<\/li><li><b>Follow the arrow on the body.<\/b> A horizontal pipe with the actuator vertical, facing up, is recommended; the manual also allows the actuator to be horizontal or facing down.<\/li><li><b>Connect the control air<\/b> to the \u00bc\u2033 BSP female port: dry air, free of oil and water, at 4 barg maximum. The control signal is shown on the nameplate.<\/li><li><b>Start up slowly:<\/b> open the isolation valves gradually and check for leaks.<\/li><\/ol><p class=\"wp-block-paragraph\">Valfonta supplies the actuator <strong>precalibrated<\/strong> to the customer\u2019s requirements; if the stroke needs readjusting, the manual describes the procedure. Actuators with preloaded springs are identified by four longer screws: release them before working on the actuator. In ATEX zones, the electrical resistance between the valve and the installation must be less than 10\u2076 \u03a9. Also review the <a href=\"https:\/\/www.valfonta.com\/en\/blog\/pressure-control-valves-common-mistakes\/\">common mistakes with pressure control valves<\/a>.<\/p><\/section><section id=\"documentacion\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">C1 technical documentation<\/h2><div class=\"wp-block-group vf-docs is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-doc vf-amb-enllac is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><i>PDF<\/i><\/p><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><b>C1 datasheet<\/b><span>PDF \u00b7 6 pages \u00b7 features, dimensions, exploded view, Kv, and allowable pressure by actuator<\/span><\/p><\/div><p class=\"vf-enllac wp-block-paragraph\"><a class=\"vf-enllac-estirat\" href=\"\/wp-content\/uploads\/2026\/10\/C1-19A-ESP.pdf\" aria-label=\"PDF C1 datasheet PDF \u00b7 6 pages \u00b7 features, dimensions, exploded view, Kv, and allowable pressure by actuator\" rel=\"noopener\" target=\"_blank\"><\/a><\/p><\/div><div class=\"wp-block-group vf-doc vf-amb-enllac is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><i>PDF<\/i><\/p><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><b>Operation, maintenance, and installation manual<\/b><span>PDF \u00b7 17 pages \u00b7 nameplate, ATEX, installation, maintenance, and receiving<\/span><\/p><\/div><p class=\"vf-enllac wp-block-paragraph\"><a class=\"vf-enllac-estirat\" href=\"\/wp-content\/uploads\/2026\/10\/manual-C1-13B-ESP.pdf\" aria-label=\"PDF Operation, maintenance, and installation manual PDF \u00b7 17 pages \u00b7 nameplate, ATEX, installation, maintenance, and receiving\" rel=\"noopener\" target=\"_blank\"><\/a><\/p><\/div><\/div><p class=\"wp-block-paragraph\">Do you need the declaration of conformity or the ATEX documentation for an order? See our <a href=\"https:\/\/www.valfonta.com\/en\/certificates\/\">quality certificates<\/a>.<\/p><\/section><section id=\"comparar\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">C1 vs. self-operated reducing valves<\/h2><p class=\"wp-block-paragraph\">The C1 is the only actuated control valve in the range. The M1, M2, and VD reducing valves regulate the outlet pressure with no auxiliary power; the C1 requires control air, but it is operated from the process control system and allows ON\/OFF service.<\/p><div class=\"wp-block-group vf-tbl-wrap is-layout-flow wp-block-group-is-layout-flow\"><figure class=\"wp-block-table vf-tbl vf-tbl--grid\"><table><thead><tr><th scope=\"col\">Model<\/th><th scope=\"col\">Actuation<\/th><th scope=\"col\">DN<\/th><th scope=\"col\">PN<\/th><th scope=\"col\">Max. T (\u00b0C)<\/th><th scope=\"col\">Steam<\/th><th scope=\"col\">Auxiliary power<\/th><\/tr><\/thead><tbody><tr><th scope=\"row\"><span class=\"vf-dato vf-dato-fila\" hidden data-vf-class=\"vf-cur\"><\/span>C1<\/th><td>Pneumatic actuator<\/td><td>15 \u2013 100<\/td><td>25 \/ 40<\/td><td>200 (350)<\/td><td>Yes<\/td><td>Air up to 4 barg<\/td><\/tr><tr><th scope=\"row\"><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valves-m1\/\">M1<\/a><\/th><td>Self-operated, diaphragm<\/td><td>15 \u2013 150<\/td><td>40<\/td><td>220<\/td><td>Yes<\/td><td>No<\/td><\/tr><tr><th scope=\"row\"><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-m2\/\">M2<\/a><\/th><td>Self-operated, diaphragm<\/td><td>15 \u2013 100<\/td><td>40<\/td><td>180<\/td><td>Yes<\/td><td>No<\/td><\/tr><tr><th scope=\"row\"><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-vd\/\">VD<\/a><\/th><td>Self-operated, piston<\/td><td>15 \u2013 100<\/td><td>40<\/td><td>200<\/td><td>Yes<\/td><td>No<\/td><\/tr><\/tbody><\/table><\/figure><\/div><p class=\"vf-note wp-block-paragraph\">In parentheses: C1 with finned bonnet and graphite packing; VD with EPDM or Viton gaskets. Data from the C1-19A datasheet and the 2025 reducing valve catalog. More criteria in our guide to <a href=\"https:\/\/www.valfonta.com\/en\/blog\/selection-of-control-valves\/\">control valve selection<\/a>.<\/p><\/section><section id=\"preguntas\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Frequently asked questions about the C1<\/h2><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What is the difference between the C1 and a self-operated reducing valve?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">The C1 moves the plug with a pneumatic actuator that responds to a control signal, so it requires control air (up to 4 barg). The <a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valves-m1\/\">M1<\/a>, <a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-m2\/\">M2<\/a>, and <a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-vd\/\">VD<\/a> reducing valves regulate the outlet pressure on their own, with no auxiliary power. We compare them in <a href=\"https:\/\/www.valfonta.com\/en\/blog\/self-operated-valve-vs-actuated-valve\/\">self-operated valve vs. actuated valve<\/a>.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What happens if the control air fails?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">The valve goes to its fail-safe position, which depends on how the actuator springs are mounted: the normally closed version closes and the normally open version opens.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Can it be controlled with a 4\u201320 mA signal?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">Yes, with the 4\u201320 mA electro-pneumatic positioner (Ex) or a smart positioner, both available as options. Accessory mounting is NAMUR to IEC 534-6. More on <a href=\"https:\/\/www.valfonta.com\/en\/blog\/automatic-control-valves\/\">automatic control valves<\/a>.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Can it be installed in an ATEX zone?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">Yes, in its version with ATEX II 2 GD marking (certificate LOM 14.034 U), for zones 1, 2, 21, and 22. The valve must be equipotentially bonded to the installation.<\/p><\/div><\/details><details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>What maintenance does it need?<\/summary><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><p class=\"wp-block-paragraph\">Wear parts are inspected according to the severity of service, with the body installed, depressurized, and isolated. Recommended spare parts: seat, packing, O-ring, and body gasket; on the actuator, plunger, springs, diaphragm, and O-ring. To order them, give the serial number on the nameplate.<\/p><\/div><\/details><\/section><section id=\"relacionados\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Self-operated alternatives to the C1<\/h2><ul class=\"vf-rel wp-block-list\"><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valves-m1\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valvula-reductora-presion-m1-perspectiva-400.webp\" alt=\"M1 reducing valve\" class=\"wp-image-201\" width=\"300\" height=\"300\" loading=\"lazy\"><b>M1 reducing valve<\/b><span>No auxiliary power, DN15\u2013150, and steam up to 220 \u00b0C.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-m2\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-M2-PROVISIONAL.jpg\" alt=\"M2 diaphragm reducing valve\" class=\"wp-image-206\" width=\"300\" height=\"300\" loading=\"lazy\"><b>M2 diaphragm reducing valve<\/b><span>No actuator, DN15\u2013100, and outlet pressures from 0.02 barg.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/bellow-pressure-reducing-valve\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-M2F.jpg\" alt=\"M2 bellows reducing valve\" class=\"wp-image-209\" width=\"300\" height=\"300\" loading=\"lazy\"><b>M2 bellows reducing valve<\/b><span>Self-operated with bellows, DN15\u201350, and steam up to 200 \u00b0C.<\/span><\/a><\/li><li><a href=\"https:\/\/www.valfonta.com\/en\/product\/pressure-reducing-valve-vd\/\"><img decoding=\"async\" src=\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valvula-reductora-presion-vd-perspectiva-400.webp\" alt=\"VD reducing valve\" class=\"wp-image-10116\" width=\"300\" height=\"300\" loading=\"lazy\"><b>VD reducing valve<\/b><span>Piston type, DN15\u2013100 and PN40, for steam up to 200 \u00b0C, liquids, and gases.<\/span><\/a><\/li><\/ul><\/section><section id=\"solicitar\" class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group vf-quote is-layout-flow wp-block-group-is-layout-flow\"><div class=\"wp-block-group is-layout-flow wp-block-group-is-layout-flow\"><h2 class=\"wp-block-heading\">Request a quote for the C1<\/h2><p class=\"wp-block-paragraph\">Give us your process details and we will propose the right size, Kv, plug, and actuator.<\/p><ul class=\"wp-block-list\"><li>Fluid, operating temperature, and operating pressure<\/li><li>Inlet and outlet pressures and maximum and minimum flow rates (or Kv)<\/li><li>Control signal and fail-safe position (NC or NO)<\/li><li>Body material, connection, and leakage class<\/li><\/ul><p class=\"vf-pdp-contact wp-block-paragraph\">You can also call <a href=\"tel:+34933720888\">933 720 888<\/a>.<\/p><\/div>\n<div class=\"wpcf7 no-js\" id=\"wpcf7-f552-o1\" lang=\"en-US\" dir=\"ltr\" data-wpcf7-id=\"552\">\n<div class=\"screen-reader-response\"><p role=\"status\" aria-live=\"polite\" aria-atomic=\"true\"><\/p> <ul><\/ul><\/div>\n<form action=\"\/en\/wp-json\/wp\/v2\/product\/652#wpcf7-f552-o1\" method=\"post\" class=\"wpcf7-form init vf-form wpcf7-acceptance-as-validation\" aria-label=\"Contact form\" novalidate=\"novalidate\" data-status=\"init\" toolname=\"solicitar_oferta\" tooldescription=\"Request a quote from Valfonta for the models on this page (model, size, fluid and pressures); a member of the team will reply.\">\n<fieldset class=\"hidden-fields-container\"><input type=\"hidden\" name=\"_wpcf7\" value=\"552\" \/><input type=\"hidden\" name=\"_wpcf7_version\" value=\"6.2.3\" \/><input type=\"hidden\" name=\"_wpcf7_locale\" value=\"en_US\" \/><input type=\"hidden\" name=\"_wpcf7_unit_tag\" value=\"wpcf7-f552-o1\" \/><input type=\"hidden\" name=\"_wpcf7_container_post\" value=\"0\" \/><input type=\"hidden\" name=\"_wpcf7_posted_data_hash\" value=\"\" \/><input type=\"hidden\" name=\"_vf_t\" value=\"1792698928.e4b6d499d8381774\" \/>\n<\/fieldset>\n<input class=\"wpcf7-form-control wpcf7-hidden\" value=\"C1\" type=\"hidden\" name=\"modelo\" \/><label>Name *<span class=\"wpcf7-form-control-wrap\" data-name=\"nombre\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text wpcf7-validates-as-required\" autocomplete=\"name\" aria-required=\"true\" aria-invalid=\"false\" value=\"\" type=\"text\" name=\"nombre\" \/><\/span><\/label><label>Company<span class=\"wpcf7-form-control-wrap\" data-name=\"empresa\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" autocomplete=\"organization\" aria-invalid=\"false\" value=\"\" type=\"text\" name=\"empresa\" \/><\/span><\/label><label>Email *<span class=\"wpcf7-form-control-wrap\" data-name=\"email\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-email wpcf7-validates-as-required wpcf7-text wpcf7-validates-as-email\" autocomplete=\"email\" aria-required=\"true\" aria-invalid=\"false\" value=\"\" type=\"email\" name=\"email\" \/><\/span><\/label><label>Phone<span class=\"wpcf7-form-control-wrap\" data-name=\"telefono\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-tel wpcf7-text wpcf7-validates-as-tel\" autocomplete=\"tel\" aria-invalid=\"false\" value=\"\" type=\"tel\" name=\"telefono\" \/><\/span><\/label><fieldset><legend>Application data (optional)<\/legend><label>Size<span class=\"wpcf7-form-control-wrap\" data-name=\"dn\"><select class=\"wpcf7-form-control wpcf7-select\" aria-invalid=\"false\" name=\"dn\"><option value=\"\">Select<\/option><option value=\"DN15\">DN15<\/option><option value=\"DN20\">DN20<\/option><option value=\"DN25\">DN25<\/option><option value=\"DN32\">DN32<\/option><option value=\"DN40\">DN40<\/option><option value=\"DN50\">DN50<\/option><option value=\"DN65\">DN65<\/option><option value=\"DN80\">DN80<\/option><option value=\"DN100\">DN100<\/option><option value=\"DN125 or DN150\">DN125 or DN150<\/option><option value=\"I don&#039;t know\">I don&#039;t know<\/option><\/select><\/span><\/label><label>Fluid<span class=\"wpcf7-form-control-wrap\" data-name=\"fluido\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" placeholder=\"steam, water, air, gas\u2026\" value=\"\" type=\"text\" name=\"fluido\" \/><\/span><\/label><label>Inlet pressure (barg)<span class=\"wpcf7-form-control-wrap\" data-name=\"p_entrada\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" value=\"\" type=\"text\" name=\"p_entrada\" \/><\/span><\/label><label>Outlet pressure (barg)<span class=\"wpcf7-form-control-wrap\" data-name=\"p_salida\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" value=\"\" type=\"text\" name=\"p_salida\" \/><\/span><\/label><label>Flow rate<span class=\"wpcf7-form-control-wrap\" data-name=\"caudal\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" placeholder=\"e.g. 5 m\u00b3\/h\" value=\"\" type=\"text\" name=\"caudal\" \/><\/span><\/label><label>Temperature (\u00b0C)<span class=\"wpcf7-form-control-wrap\" data-name=\"temperatura\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" value=\"\" type=\"text\" name=\"temperatura\" \/><\/span><\/label><label>Control signal<span class=\"wpcf7-form-control-wrap\" data-name=\"senal\"><input size=\"40\" maxlength=\"400\" class=\"wpcf7-form-control wpcf7-text\" aria-invalid=\"false\" placeholder=\"e.g. 4\u201320 mA or 0.2\u20131 bar\" value=\"\" type=\"text\" name=\"senal\" \/><\/span><\/label><\/fieldset><label class=\"vf-full\">Message<span class=\"wpcf7-form-control-wrap\" data-name=\"mensaje\"><textarea cols=\"40\" rows=\"4\" maxlength=\"2000\" class=\"wpcf7-form-control wpcf7-textarea\" aria-invalid=\"false\" name=\"mensaje\"><\/textarea><\/span><\/label><label class=\"vf-chk vf-full\"><span class=\"wpcf7-form-control-wrap\" data-name=\"privacidad\"><span class=\"wpcf7-form-control wpcf7-acceptance\"><span class=\"wpcf7-list-item\"><input type=\"checkbox\" name=\"privacidad\" value=\"1\" aria-invalid=\"false\" \/><\/span><\/span><\/span> <span>I have read and accept the <a href=\"\/en\/privacy-policy\/\">privacy policy<\/a> *<\/span><\/label><input class=\"wpcf7-form-control wpcf7-submit has-spinner vf-btn vf-btn--pri\" type=\"submit\" value=\"Send request\" \/><span class=\"vf-hp\" aria-hidden=\"true\"><label>Web <input type=\"text\" name=\"vf_web\" value=\"\" tabindex=\"-1\" autocomplete=\"off\" toolparamdescription=\"Campo de control: d\u00e9jalo vac\u00edo\"><\/label><\/span><div class=\"wpcf7-response-output\" aria-hidden=\"true\"><\/div>\n<\/form>\n<\/div>\n\n<\/div><\/section><div class=\"wp-block-group vf-pdp-bar is-layout-flow wp-block-group-is-layout-flow\"><p class=\"vf-envolt wp-block-paragraph\"><a class=\"vf-btn vf-btn--sec\" href=\"tel:+34933720888\">Call<\/a><a class=\"vf-btn vf-btn--pri\" href=\"#solicitar\">Request a quote<\/a><\/p><\/div><\/article><\/div>","protected":false},"excerpt":{"rendered":"<p>Home\u203aControl valves\u203aC1 control valve with pneumatic actuator Control valve \u00b7 Pneumatic actuator C1 control valve with pneumatic actuator Modulating or ON\/OFF Single-seat, top-entry globe control valve operated by a multi-spring pneumatic diaphragm actuator. It regulates gases, vapors, and liquids in modulating or ON\/OFF service, from DN15 to DN100 and up to PN40. Request a quoteDownload ... <a title=\"C1 control valve with pneumatic actuator\" class=\"read-more\" href=\"https:\/\/www.valfonta.com\/en\/product\/c1-gas-control-valve\/\" aria-label=\"Read more about C1 control valve with pneumatic actuator\">Read more<\/a><\/p>\n","protected":false},"featured_media":0,"template":"","meta":{"_acf_changed":false,"_generate-full-width-content":"true","_generate-disable-headline":"true","rank_math_title":"C1 control valve with pneumatic actuator | Valfonta","rank_math_description":"C1 single-seat globe control valve with pneumatic diaphragm actuator. DN15 to DN100, PN25\/PN40, Kv up to 130 m\u00b3\/h, modulating or ON\/OFF.","rank_math_focus_keyword":"","vf_jsonld":"[{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Organization\",\"@id\":\"https:\/\/www.valfonta.com\/#organization\",\"name\":\"Valfonta\",\"legalName\":\"Val Fonta, S.L.\",\"taxID\":\"B59935718\",\"url\":\"https:\/\/www.valfonta.com\/en\/\",\"logo\":{\"@type\":\"ImageObject\",\"url\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/valfonta-logo.webp\"},\"foundingDate\":\"1962\",\"email\":\"valfonta@valfonta.com\",\"telephone\":\"+34 933 720 888\",\"address\":{\"@type\":\"PostalAddress\",\"streetAddress\":\"C\/ Bronze 26, Pol. Ind. Les Guixeres\",\"postalCode\":\"08915\",\"addressLocality\":\"Badalona\",\"addressRegion\":\"Barcelona\",\"addressCountry\":\"ES\"},\"description\":\"Design, manufacture, and sale of pressure reducing valves, pressure relief valves, and control valves.\"},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.valfonta.com\/#website\",\"url\":\"https:\/\/www.valfonta.com\/en\/\",\"name\":\"Valfonta\",\"publisher\":{\"@id\":\"https:\/\/www.valfonta.com\/#organization\"},\"inLanguage\":\"en\"},{\"@type\":\"ItemPage\",\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/c1-gas-control-valve\/#webpage\",\"url\":\"https:\/\/www.valfonta.com\/en\/product\/c1-gas-control-valve\/\",\"name\":\"C1 control valve with pneumatic actuator | Valfonta\",\"description\":\"C1 single-seat globe control valve with pneumatic diaphragm actuator. DN15 to DN100, PN25\/PN40, Kv up to 130 m\u00b3\/h, modulating or ON\/OFF.\",\"isPartOf\":{\"@id\":\"https:\/\/www.valfonta.com\/#website\"},\"about\":{\"@id\":\"https:\/\/www.valfonta.com\/#organization\"},\"inLanguage\":\"en\",\"datePublished\":\"2020-02-04T12:54:06+02:00\",\"dateModified\":\"2026-03-19T14:51:26+02:00\",\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-C1-PROVISIONAL-700x700-1.jpg\"},\"breadcrumb\":{\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/c1-gas-control-valve\/#breadcrumb\"},\"mainEntity\":{\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/c1-gas-control-valve\/#product\"}},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-C1-PROVISIONAL-700x700-1.jpg\",\"url\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-C1-PROVISIONAL-700x700-1.jpg\",\"width\":\"1000\",\"height\":\"1000\",\"caption\":\"Control valve\",\"inLanguage\":\"en\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/c1-gas-control-valve\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/www.valfonta.com\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Control valves\",\"item\":\"https:\/\/www.valfonta.com\/en\/control-valve\/\"},{\"@type\":\"ListItem\",\"position\":3,\"name\":\"C1 control valve with pneumatic actuator\",\"item\":\"https:\/\/www.valfonta.com\/en\/product\/c1-gas-control-valve\/\"}]},{\"@type\":\"Product\",\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/c1-gas-control-valve\/#product\",\"name\":\"C1 control valve with pneumatic actuator\",\"url\":\"https:\/\/www.valfonta.com\/en\/product\/c1-gas-control-valve\/\",\"description\":\"Single-seat, top-entry globe control valve operated by a multi-spring pneumatic diaphragm actuator. It regulates gases, vapors, and liquids in modulating or ON\/OFF service, from DN15 to DN100 and up to PN40.\",\"brand\":{\"@type\":\"Brand\",\"name\":\"Valfonta\"},\"manufacturer\":{\"@id\":\"https:\/\/www.valfonta.com\/#organization\"},\"model\":\"C1\",\"image\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/ok-C1-PROVISIONAL-700x700-1.jpg\",\"material\":\"Bronze RG-10 (CuSn10-CC480K), carbon steel GP240GH (1.0619), or stainless steel CF3M (1.4408)\",\"additionalProperty\":[{\"@type\":\"PropertyValue\",\"name\":\"Type\",\"value\":\"Globe, two-way, single seat, top entry, guided plug\"},{\"@type\":\"PropertyValue\",\"name\":\"Connections\",\"value\":\"EN 1092-1 Type B1 flanges \u00b7 ANSI 150\/300 \u00b7 On request: BSP or NPT thread, BW or SW\"},{\"@type\":\"PropertyValue\",\"name\":\"Body and pressure rating\",\"value\":\"PN25: RG-10 bronze (EN 1982 CuSn10-CC480K) \u00b7 PN40: GP240GH \/ A216 WCB (1.0619) carbon steel \u00b7 PN40: CF3M (1.4408) stainless steel\"},{\"@type\":\"PropertyValue\",\"name\":\"Fluids\",\"value\":\"Gases, vapors, and liquids\"},{\"@type\":\"PropertyValue\",\"name\":\"Flow characteristic\",\"value\":\"Equal-percentage, linear, or ON\/OFF\"},{\"@type\":\"PropertyValue\",\"name\":\"Kv coefficient\",\"value\":\"3.5 (DN15) to 130 m\u00b3\/h (DN100). Reduced Kv and bore on request\"},{\"@type\":\"PropertyValue\",\"name\":\"Leakage class\",\"value\":\"Class IV (metal-to-metal) \u00b7 Class VI (PTFE+graphite plug). On request: PEEK, NBR, EPDM, stellited seat\"},{\"@type\":\"PropertyValue\",\"name\":\"Bonnet\",\"value\":\"Standard: \u22125 to +200 \u00b0C \u00b7 Finned: over +200 \u00b0C \u00b7 Extended: below \u22125 \u00b0C \u00b7 With bellows: on request\"},{\"@type\":\"PropertyValue\",\"name\":\"Stem sealing\",\"value\":\"Standard: double PTFE+graphite V-ring, up to +200 \u00b0C \u00b7 PTFE: up to +150 \u00b0C \u00b7 Graphite: up to +350 \u00b0C \u00b7 Bellows: on request\"},{\"@type\":\"PropertyValue\",\"name\":\"Actuator\",\"value\":\"Multi-spring diaphragm, reversible in-line: HF.205, HF.275, HF.360, and HF.430 (10 to 25 kg). Steel 1.0335 with epoxy paint and fabric-reinforced EPDM diaphragm\"},{\"@type\":\"PropertyValue\",\"name\":\"Control air\",\"value\":\"Up to 4 barg, \u00bc\u2033 BSP female connection, dry air free of oil and water\"},{\"@type\":\"PropertyValue\",\"name\":\"Control signals\",\"value\":\"0.2\u20131 \u00b7 0.4\u20131.2 \u00b7 0.4\u20132 \u00b7 1.5\u20133.2 bar, depending on actuator\"},{\"@type\":\"PropertyValue\",\"name\":\"Fail-safe position\",\"value\":\"Normally closed or normally open\"},{\"@type\":\"PropertyValue\",\"name\":\"Options\",\"value\":\"Electro-pneumatic positioner (Ex) 4\u201320 mA or smart positioner, filter regulator, handwheel, solenoid valve, alarm contacts, stainless steel construction, anti-cavitation and low-noise cage. NAMUR mounting (IEC 534-6)\"},{\"@type\":\"PropertyValue\",\"name\":\"Pressure equipment\",\"value\":\"The nameplate indicates whether it carries CE marking under PED 2014\/68\/EU. Declaration of conformity on request\"},{\"@type\":\"PropertyValue\",\"name\":\"ATEX\",\"value\":\"II 2 GD c IIC Tx \/ c IIIC Tx\u00baC \u00b7 certificate LOM 14.034 U\"}],\"category\":\"Control valves\",\"subjectOf\":[{\"@type\":\"DigitalDocument\",\"name\":\"C1 datasheet\",\"url\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/C1-19A-ESP.pdf\",\"encodingFormat\":\"application\/pdf\"},{\"@type\":\"DigitalDocument\",\"name\":\"Operation, maintenance, and installation manual\",\"url\":\"https:\/\/www.valfonta.com\/wp-content\/uploads\/2026\/10\/manual-C1-13B-ESP.pdf\",\"encodingFormat\":\"application\/pdf\"}]},{\"@type\":\"FAQPage\",\"@id\":\"https:\/\/www.valfonta.com\/en\/product\/c1-gas-control-valve\/#faq\",\"mainEntity\":[{\"@type\":\"Question\",\"name\":\"What is the difference between the C1 and a self-operated reducing valve?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The C1 moves the plug with a pneumatic actuator that responds to a control signal, so it requires control air (up to 4 barg). The M1, M2, and VD reducing valves regulate the outlet pressure on their own, with no auxiliary power. We compare them in self-operated valve vs. actuated valve.\"}},{\"@type\":\"Question\",\"name\":\"What happens if the control air fails?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"The valve goes to its fail-safe position, which depends on how the actuator springs are mounted: the normally closed version closes and the normally open version opens.\"}},{\"@type\":\"Question\",\"name\":\"Can it be controlled with a 4\u201320 mA signal?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, with the 4\u201320 mA electro-pneumatic positioner (Ex) or a smart positioner, both available as options. Accessory mounting is NAMUR to IEC 534-6. More on automatic control valves.\"}},{\"@type\":\"Question\",\"name\":\"Can it be installed in an ATEX zone?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Yes, in its version with ATEX II 2 GD marking (certificate LOM 14.034 U), for zones 1, 2, 21, and 22. The valve must be equipotentially bonded to the installation.\"}},{\"@type\":\"Question\",\"name\":\"What maintenance does it need?\",\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Wear parts are inspected according to the severity of service, with the body installed, depressurized, and isolated. Recommended spare parts: seat, packing, O-ring, and body gasket; on the actuator, plunger, springs, diaphragm, and O-ring. To order them, give the serial number on the nameplate.\"}}]}]}]"},"product_brand":[],"product_cat":[79],"product_tag":[],"class_list":["post-652","product","type-product","status-publish","product_cat-sin-categorizar","first","instock","shipping-taxable","product-type-simple"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/product\/652","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/types\/product"}],"wp:attachment":[{"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/media?parent=652"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/product_brand?post=652"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/product_cat?post=652"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/www.valfonta.com\/en\/wp-json\/wp\/v2\/product_tag?post=652"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}