The Spirax-Sarco Pressure Reducing Valve by SpiraValve is an industrial valve produced by the UK-based Spirax Sarco company, primarily used for pressure regulation of steam, air, natural gas, and other media. Key features include stable outlet pressure, adaptability to various operating conditions, and modular design.

Core Structure and Features

Utilizing a pilot piston design consisting of a main valve and a guide valve. The main valve adjusts pressure through components like the valve seat and piston, while the guide valve is composed of a diaphragm and an adjusting spring, driving the main valve's opening adjustment by sensing changes in the outlet pressure. This design ensures that the outlet pressure remains unaffected by fluctuations in the inlet pressure or flow changes, maintaining long-term stability.

Primary Application Scenarios

Steam System: Suitable for industrial water supply, fire protection water supply, and domestic water network, achieves pressure and temperature reduction through cooling water injection.

Gas Pipeline: Supports mediums such as air, nitrogen, natural gas, etc., suitable for industrial fluid control applications.

Core series and models

Key models include:

25P Series: Guide valve type diaphragm pressure reducing valve, supporting pressure adjustment (0.2-14 barg) and temperature control. Modular design allows for combination of different guide valves for composite control.

DP27 Series: Designed for steam systems, maintains stable outlet pressure through dynamic balance.

DP143 Series: Engineered for high-pressure conditions, capable of handling pressure regulation above 14 barg.

Material and Maintenance

Valve bodies are made of cast iron, cast steel, and stainless steel, with an enhanced diaphragm material to increase effective area. Modular design facilitates maintenance, allowing for component disassembly and inspection without moving the main valve body.