Válvula de control con actuador neumático C1

Pneumatic Actuator Control Valve C1

Sizes:

DN15 to DN100 (others upon request)

Connection:

Flanges (EN, ANSI) and Threads (BSP, NPT)

Fluids:

Liquids, inert gases and steam

Body material:

RG10, WCB, CF3M, ...

Nominal pressure:

PN25 - PN40 / CLASS 150 - 300

Max. inlet pressure:

40 barg

Kvs value:

Up to 130 m3/h

CATALOG

MANUAL

Description

The C1 control valve from Valfonta is a single seat regulating unit with a "Top Entry" design, operated by a multi-spring pneumatic diaphragm actuator. It has been designed for precise control of gases, steam and liquids in industrial processes, offering reliable service for both modulating control and ON/OFF applications.

Its main advantage lies in its modular concept: it allows for multiple combinations of plugs (linear, equal percentage), bonnet types (standard, finned, extended, or with bellow) and materials, adapting to extreme conditions of temperature and pressure. The globe-type body design ensures optimal fluid hydrodynamics, while the guided plug ensures high operational stability even at high differential pressures.

Dimensional Range: From DN15 up to DN100 (DN125 and DN150 on request).
Nominal Pressure:
- PN25: Ductile Iron (GJS-400) and Bronze (RG-10).
- PN40: Carbon Steel (WCB) and Stainless Steel (CF8M/CF3M).
Control Types (Flow Characteristic): Plugs available with Equal Percentage, Linear, or quick opening (ON/OFF) curve.
Bonnets and Temperature: Adaptable according to process:
- Standard: -5 °C to +200 °C.
- Finned (High Temperature): For fluids > 200 °C.
- Extended (Cryogenic): For fluids < -5 °C.
- Sealing Bellow: For thermal or hazardous fluids (up to 350 °C).
Shut-off Class: Class IV (metal-to-metal seat) or Class VI (tight sealing with PTFE+Graphite seat).
Actuator: Diaphragm pneumatic (reinforced EPDM), field reversible, with air signal up to 4 barg.

Features

The C1 valve regulates the flow by modifying the plug position in response to a pneumatic control signal acting on the actuator diaphragm:

Modulation: The air signal presses the diaphragm, overcoming the force of the springs and moving the stem to open or close the valve according to process requirements.
Safety (Fail-Safe): The valve has a safety position in the event of air or electrical signal failure:
- Normally Closed (NC): In the event of air failure, the springs automatically close the valve.
- Normally Open (NO): In the event of air failure, the springs automatically open the valve.

Operation

To ensure control accuracy and actuator lifespan:

Installation Position: It is recommended to install preferably in horizontal piping with the actuator in an upright vertical position.
Straight Sections: To avoid turbulence affecting the control, it is advised to leave a straight run free from obstacles of 6 x DN before and after the valve.
Bypass: It is recommended to install isolation valves and a manual bypass to facilitate maintenance work without stopping the process.
Instrument Air: The air connection to the actuator is 1/4" BSP. The supplied air must be dry, filtered and oil-free, with a maximum pressure of 4 barg.
Filters: It is vital to install a "Y" filter upstream to protect the plug and seat from damage by solid particles.