Description
A Carbon Steel Pressure Reducing Valve (PRV) is an automatic valve designed to reduce and regulate high inlet pressure to a desired lower outlet pressure. It maintains a preset downstream pressure regardless of fluctuations on the upstream side, ensuring safe and stable operation of piping systems, equipment, and end-use appliances.
Construction & Materials
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Body & Bonnet: Carbon Steel (ASTM A216 WCB / A105)
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Trim (Disc, Seat, Stem): Stainless Steel / Alloy Steel
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Control Spring & Diaphragm: Stainless Steel / Fabric-Reinforced Elastomer
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Seals & Gaskets: Buna-N / EPDM / PTFE (service dependent)
Operating Principle
Works automatically using a diaphragm, spring, and pilot arrangement:
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Upstream high pressure pushes on the diaphragm.
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The internal spring tension is set to the desired outlet pressure.
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The valve modulates opening or closing to maintain stable downstream pressure.
Standards & Compliance
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API 526 / API 527 (where applicable)
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ASME B16.34 (valve dimensions & ratings)
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ANSI / BS / ISO compatible designs
Key Features
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Automatic pressure regulation without external power
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Smooth response to pressure fluctuations
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Accurate downstream pressure control
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Robust carbon steel construction for high temperature & pressure
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Long service life with minimal maintenance
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Optional pilot-assisted or direct-acting configurations
Typical Pressure Class & Ratings
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Pressure Classes: Class 150 to Class 600 (or custom)
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Pressure Range: From high inlet (e.g., 250–3000 psi) to controlled lower outlet
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Temperature Range: Suitable for hot water, steam, air, gas, oil systems
Applications
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Steam & Condensate Lines
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Compressed Air Systems
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Hydraulic & Process Control Plants
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Water & Firefighting Systems
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Oil & Gas Facilities
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Chemical & Petrochemical Industries
Why Use a CS Pressure Reducing Valve?
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Protects downstream equipment from overpressure damage
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Improves energy efficiency
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Ensures consistent process performance
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Reduces wear and tear on valves and instruments
