The M1 pressure reducing valve from Valfonta is a self-actuated, single-seat device designed for precise outlet pressure control without the need for auxiliary energy. It is a versatile and robust solution, suitable for operation with steam, compressed air, neutral gases, and liquids.
This model stands out for its quick and effective response to demand changes. Its construction design incorporates a double-layer stainless steel bellows with anti-torsion system, ensuring tight sealing of the stem to the outside and friction-free operation. In addition, it features a pressure chamber with reinforced diaphragms, ensuring long service life and operational reliability in critical industrial processes.
- Dimensional Range: From DN15 up to DN150.
- Nominal Pressure and Connections: Available with EN1092 flanges (PN16-PN40), ANSI 150/300 and threaded BSP/NPT connections.
- Inlet Pressure Limits: Up to 40 barg (DN15-DN50) and 25 barg (DN65-DN150).
- Control Range: Broad outlet pressure spectrum, adjustable between 0.1 and 15 barg.
- Body Materials: Ductile Iron (GGG40.3), Carbon Steel (A216 WCB) and Stainless Steel (A351 CF3M). Bronze (RG10) option available on request.
- Internals: Seat, plug, and internal parts entirely manufactured in AISI 316L Stainless Steel.
- Maximum Temperature: Up to 250 °C (with metal or PEEK plug) and 220 °C (with PTFE+GR).
- Compensation System: Models from DN65 incorporate a compensation piston that balances the inlet pressure, absorbing fluctuations to maintain downstream stability.
The operating principle is based on the balance of forces. The fluid flows through the valve moving the plug, and the resulting outlet pressure is transmitted to the diaphragm chamber through an external sense line.
This pressure exerts a force on the diaphragm that opposes the tension of the previously adjusted regulating spring.
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If the outlet pressure exceeds the set value, the force on the diaphragm overcomes the spring and the valve proportionally closes.
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If the pressure drops due to increased demand, the spring pushes the plug, opening the flow path of the fluid.
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In large sizes (DN65-150), the compensation piston neutralizes the inlet pressure variations, ensuring that only the outlet pressure governs regulation.
- Position: Must be installed exclusively on a horizontal pipe.
- Standard: Actuator vertical upwards (Required for steam and T > 80°C).
- Allowed: Actuator downwards only for gases and liquids with T < 80°C.
- Filtration: It is essential to install a strainer filter upstream to protect the seal from pipe impurities.
- Sensing Line: Requires an external connection using a 10x1 mm tube to the outlet piping. This connection must be made in a zone free from turbulence, at least 1 meter away from the valve outlet.
- Thermal Protection (Condensate Pot): For applications with steam or liquids at T > 125°C, a condensate tank (pot) must be installed on the sensing line. This should be filled with water before startup to protect the diaphragm from high temperatures.
