Types of industrial pressure reducing valves

At Valfonta, we offer a wide range of industrial pressure reducing valves, designed to ensure safety, efficiency, and stability in processes where pressure control is a critical factor.

With over 50 years of experience in design and manufacturing, we have developed models that adapt to the needs of multiple sectors, from the chemical and pharmaceutical industries to energy, food, and water treatment.

Most of our valves are prepared to work with liquids, neutral gases, and steam, and are manufactured in different materials and configurations to respond to very diverse conditions of flow, pressure, and temperature.

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Thanks to this approach, we have solutions capable of covering a wide range of industrial applications, from compact installations in laboratories to complex distribution networks in large plants.

This is a pressure regulating valve self-actuated by a diaphragm to maintain stable downstream pressure without the need for auxiliary energy. It is designed for steam, compressed air, neutral gases, and liquids, with rapid response to changes in demand and proportional closing when P2 increases.

From DN65 it incorporates a compensation plunger to stabilize the influence of the inlet pressure. The stem is sealed with a stainless steel double bellows (anti-torsion system) and the pressure chamber mounts reinforced diaphragms, which improves tightness and durability.

Main technical characteristics

• Available with regulation range 0.1–15 barg and maximum inlet pressure 40 barg (DN15–50) / 25 barg (DN65–150).
• Bodies in nodular iron GGG40.3, carbon steel A216 WCB or stainless steel A351 CF3M; connections EN 1092 PN16–PN40, ANSI 150/300 and BSP/NPT threads; internals in AISI 316L.
• Diaphragms EPDM (-40 to 125 °C) or EPDM+PTFE (up to 250 °C); different shutter materials (graphite PTFE, NBR, PEEK, etc.).
• Optional ATEX suitability (II 2 GD) for zones 1/2 (gas) and 21/22 (dust). Reference Kv according to size: 3.5 to 240 m³/h (DN15–DN150).

Typical applications: pressure reduction/stabilization in steam lines (with a condensate separator if >125 °C), compressed air networks, industrial water and neutral gases; ideal as an autonomous regulator in process downpipes, feeding to exchangers and protection of sensitive equipment where low maintenance and high reliability are required.

Pressure reducing valve M1

M2 pressure reducing valve

The Valfonta M2 pressure reducing valve is a direct-acting model that operates without the need for auxiliary energy. Its regulation is achieved thanks to a control diaphragm that balances the downstream pressure with the force of an adjustment spring, which allows it to maintain a stable outlet pressure even with oscillations in the inlet.

This design makes it especially suitable for liquids, neutral gases, compressed air, and steam, offering a quick and reliable response in applications where constant and safe regulation is required.

Main technical characteristics:

• Sizes available: DN15 to DN100, covering a wide range of installations.
• Maximum inlet pressure: up to 40 barg, which makes it suitable for demanding systems.
• Regulation range: different adjustable ranges depending on the spring installed, which allows it to be precisely adapted to each process need.
• Robust construction: body in nodular cast iron, carbon steel, or stainless steel, depending on service requirements.
• Reinforced diaphragm: made of EPDM or combined with PTFE for higher temperatures, guaranteeing resistance and long service life.
• Connections: available in EN1092 (PN16–PN40), ANSI 150/300 or BSP/NPT threaded flanges, offering integration flexibility.
• Shutter and internal components: in AISI 316L stainless steel, which ensures resistance to corrosion and compatibility with a wide range of fluids.

Operational advantages:

• Requires no external energy: simplicity of installation and low operating cost.
• Diaphragm compensation: ensures a stable and precise outlet pressure.
  
• Reduced maintenance: compact and simple design that minimizes wear points.
• Versatility: suitable for both industrial uses and general service applications.

In summary, the M2 valve combines reliability, low maintenance, and ease of integration, becoming an efficient solution for maintaining controlled pressure in water, steam, air, or industrial gas networks.

The M2 pressure reducing valve with bellows from Valfonta is a self-operated bellows model designed to maintain a constant outlet pressure, even when oscillations occur in the inlet pressure. It is a robust and reliable solution for applications where stable control is required without the need for auxiliary energy.

Main technical characteristics:

• Operating principle: the valve closes automatically when the outlet pressure increases, regulating proportionally and precisely thanks to the action of the spring and the stainless steel bellows.
• Common applications: steam (up to 200 °C), compressed air, inert gases, water, fuel oil, fire protection systems, chemical laboratory facilities, water distribution, and irrigation systems.
• Available regulation ranges:
  • 1 to 4 barg
  • 3 to 10 barg
  • (other ranges upon request).
• Maximum inlet pressure: 25 barg.
• Temperature limits:
  • Up to 200 °C (steam)
  • Up to 150 °C (air and nitrogen)
  • Up to 80 °C (other gases).
• Dimensions: available in nominal diameters DN15 to DN50, with Kv from 3.5 to 32 m³/h depending on size.

Pressure reducing valve M2 with bellows

• Body materials: nodular iron GGG40.3, bronze RG10, carbon steel A216 WCB or stainless steel A351 CF3M, with interiors in AISI 316L stainless steel.
• Sealing materials: graphite PTFE as standard, with options in NBR, EPDM, FKM or PEEK on demand.
• Connections: DIN PN16-PN40, ANSI 150/300 flanges, or BSP/NPT threads (also BW/SW upon request).
• Installation: can be mounted in any position, although it is recommended in horizontal piping and always following the flow direction indicated on the body.

Additional options:

• Can be supplied with an external control port for installations that require more precise regulation or when there are distributors downstream.

Certification and safety:

Complies with directive PED 2014/68/EU and has versions with ATEX II 2 GD marking, suitable for classified zones 1/21 and 2/22 in explosive atmospheres.

Pressure reducing valve PRV20

The Valfonta PRV20 pressure reducing valve is a self-operated and piston-balanced model, designed to provide a constant outlet pressure even when oscillations occur in the inlet pressure. Its operation is direct acting: the inlet pressure acts on the piston and the regulating spring, closing the valve as soon as the outlet pressure exceeds the set value.

• Available regulation ranges:
  • 0.2 to 2 barg
  • 1 to 8 barg
  • 5 to 20 barg
• Maximum inlet pressure: 40 barg
• Working temperature: from -20 ºC to 80 ºC (others upon request)
• Standard sizes: DN 1/4”, 3/8”, 1/2” and 3/4”, with BSP or NPT threaded connections
• Construction materials: body and internals in AISI 316L stainless steel (with bronze option upon request), NBR, FKM or EPDM gaskets.
• Kv according to size: from 1.2 to 2.4.

The PRV20 is characterized by its simple adjustment by means of a regulating screw, absence of regular maintenance and possibility of being installed in any position without affecting its performance.

Common applications

This model is especially used in:

• Chemical laboratories
• Sanitary plants
• Compressed air systems
• Installations where robust and reliable pressure control is required without depending on auxiliary energy.

ATEX certification

The PRV20 has ATEX (II 2 GD) certification for zones 1 and 21, which makes it suitable for working in explosive atmospheres with gases, vapors, flammable liquids or combustible dusts.

The PRV30 is a self-regulating and piston-balanced pressure reducing valve, designed to maintain a constant outlet pressure even when the inlet pressure presents oscillations. It is a direct-acting valve: the inlet pressure acts on the piston and, thanks to the difference in sections, regulates the opening or closing of the valve. When the downstream pressure exceeds the set value, the valve closes automatically to restore balance.

• Outlet pressure range: available in various configurations, from 0.5–3 barg, 1–8 barg and 4–12 barg, which allows it to be adapted to different industrial needs.
• Maximum inlet pressure: up to 25 bar.
• Service temperature: depends on the elastomer chosen; -30 °C to +80 °C with NBR, -10 °C to +125 °C with EPDM and up to +150 °C with Viton.
• Construction materials: body, cap, seat and piston made entirely of AISI 316L stainless steel, guaranteeing corrosion resistance and durability even in demanding conditions.
• Connections: available with BSP/NPT threads or DIN and ANSI flanges, which facilitates its integration into different installations.

Special options: versions in bronze or superduplex, welded connections (socket weld, butt welding), sanitary clamp, degreasing for oxygen and specific gaskets (EPDM, Viton, PEEK, Aflas).

Pressure reducing valve PRV30

In addition, the PRV30 does not require frequent maintenance, can be installed in any position and its adjustment is simple, by means of a screw that compresses the regulating spring.

Its common applications include chemical laboratories, pharmaceutical and sanitary plants, compressed air installations and water or neutral gas networks. Thanks to its robustness and versatility, it is one of the most demanded options for industrial environments that require stability, reliability and minimal maintenance intervention

Pressure reducing valve PRV44

The Valfonta PRV44 is a self-regulating and bellows-balanced pressure reducing valve, designed to maintain a constant outlet pressure even when oscillations occur in the inlet. It is a direct-acting model, where the inlet pressure acts on the obturator and closes it due to the difference in sections, thus offering precise and stable regulation.

Main technical characteristics:

• Maximum inlet pressure: 25 barg.
• Available regulation ranges: 0.5–3 / 1–8 / 4–12 barg, adapting to different working scenarios.
• Service temperature: from –30 °C to 210 °C, making it suitable for demanding conditions.
• Materials: body, internals and bonnet in AISI 316L stainless steel, with micro-plasma welded bellows for high durability.

Connections: available in BSP or NPT thread, and in DIN or ANSI flanges.

Operational advantages:

• Requires no frequent maintenance thanks to its robust and balanced design.
• Can be installed in any position of the pipe without compromising its operation.
• Simple adjustment by means of a regulating screw, which facilitates its start-up and configuration.

Options on request:

• Reduced Kv (0.2 / 0.4 / 0.6 / 1 m³/h).
• Alternative materials such as bronze or super duplex for body and bonnet.
• Special connections (socket weld, butt welding, clamp).
• Oxygen-degreased components and special gaskets (EPDM, PEEK, Viton, Aflas).

Common applications:
The PRV44 is especially recommended for working with group 2 liquids and gases, including compressed air, water and steam. It is used in chemical laboratories, sanitary plants, compressed air systems and steam circuits, among others.

In addition, this model has ATEX certification (II 2 GD), which makes it suitable for zones 1 and 21 with risk of explosive atmospheres, strictly complying with the European standard 2014/34/EU

The PRV45 pressure reducing valve is a self-regulating and piston-balanced valve, designed to provide a stable outlet pressure even when the inlet pressure fluctuates. Its operation is direct acting: the inlet pressure acts on the valve closure, which responds proportionally to maintain the setpoint value set in the regulation.

This model stands out for its ease of adjustment and low maintenance, and can be installed in any position without affecting its performance. It is available in sizes DN15 to DN25, with a maximum inlet pressure of 25 bar and a very wide regulation range, from 0.01 to 8 barg. As for temperatures, it can work between –20 ºC and 80 ºC with liquids and gases, and up to 180 ºC in steam applications.

Manufactured mainly in AISI 316L stainless steel, with the option of a RG10 bronze body, the PRV45 guarantees high resistance to corrosion and a long service life in demanding conditions. Its connections can be BSP/NPT threaded, DIN/ANSI flanged or sanitary clamp, which makes it a very versatile valve for different installation configurations.

Pressure reducing valve PRV45

Among its most common applications are:

• Chemical laboratories and sanitary plants.
• Compressed air and neutral gas networks.
• Processes with steam and industrial water.
• Installations that require reliable and stable pressure control with minimal maintenance.

In addition, this model has ATEX certification (category II 2 GD, zones 1/21 and 2/22), which makes it suitable for working in explosive atmospheres with liquids, flammable gases or combustible dusts, provided that the thermal limits and the established installation conditions are respected

Pressure reducing valve VD

The Valfonta VD pressure reducing valve is a direct-acting, self-operated device, designed to maintain a constant outlet pressure thanks to its regulating piston system, guided by three points to guarantee maximum stability and reliability in control.

It has a standard regulation range of 1.5 to 8 barg, expandable up to 16 barg, and supports inlet pressures of up to 40 barg. Depending on the material of its gaskets (NBR or EPDM), the valve can work with temperatures of up to 80 ºC or even 150 ºC.

It is made of high-strength materials such as nodular iron GGG40.3, bronze, carbon steel GSC25N or AISI 316 stainless steel (CF3M), with AISI 316 stainless steel internals to guarantee durability even in demanding conditions.

As for connections, the VD offers great versatility:

• DIN PN16–PN40 flanges
• ANSI Class 150 and 300 flanges
• BSP or NPT threaded (up to 2”)

Among its most common applications are:

• Water and wastewater distribution installations.
• Compressed air and neutral gas systems.
• Fuel-oil networks and light industrial installations.
• Sprinkler systems, chemical laboratories or plants with auxiliary processes.
  

In addition, the valve has ATEX category II 2 GD certification for zones 1, 2, 21 and 22, which makes it suitable for working in potentially explosive atmospheres.

Its maintenance is minimal, thanks to a robust and simple design that does not require frequent adjustments. In the event of component replacement, Valfonta recommends original kits of gaskets, seals and springs to ensure the service life and optimum performance of the equipment.