Pressure Seal Swing Check Valve

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Pressure Seal Swing Check Valve Manufacturer

A pressure seal swing check valve is a type of non-return valve used in power generation, oil and gas, and industrial process systems that is intended for high-pressure and high-temperature applications. Its swing-type disc permits flow in a single direction and, in the case that the flow reverses, automatically closes to stop backflow. As pressure rises, the pressure seal bonnet design ensures leak-tight performance by improving the seal between the body and dome using the internal system pressure.

Features of Pressure Seal Swing Check Valve
  • Pressure Seal Bonnet :

    Unlike bolted bonnets, pressure seal bonnets use internal pressure to improve the seal as pressure increases.

  • Swing Type Disc :

    Hinged disc swings open with forward flow and closes automatically with reverse flow to prevent backflow.

  • High Pressure & Temperature Capability :

    Designed for critical service conditions, typically in ANSI Class 900–2500 pressure ranges.

  • Metal-to-Metal Seating :

    Provides tight shutoff and high durability in severe environments; often hard-faced with materials like Stellite.

  • Low Maintenance Requirements :

    Rugged construction and fewer leak paths reduce the need for frequent maintenance.

Specifications of Pressure Seal Swing Check Valve

Specification Details
Size Range 2 inches to 36 inches (50 mm to 900 mm)
Pressure Rating ANSI Class 900 to Class 2500+
Material of Construction Carbon Steel, Alloy Steel, Stainless Steel, Duplex Steel
End Connection RF (Raised Face), RTJ (Ring Type Joint), BW (Butt Weld)
Bonnet Type Pressure Seal Bonnet with gasket or metal seal
Applicable Standards ASME B16.34, API 594, API 6D, MSS-SP-125
Seal Type Metal-to-metal, hard-faced (e.g., Stellite)
Body Design Pressure Seal Bonnet
Test Standards API 598, API 6D, or as per customer specification

FAQ's Of Pressure Seal Swing Check Valve

1. What is a Pressure Seal Swing Check Valve? + A valve designed with a pressure seal bonnet and a swing-type disc that allows flow in one direction and prevents backflow, suitable for high-pressure and high-temperature applications.
2. Where are Pressure Seal Swing Check Valves commonly used? + They are widely used in power plants, oil and gas, petrochemical industries, and high-pressure steam systems.
3. What are the advantages of a pressure seal bonnet? + It improves sealing as internal pressure increases, reduces gasket failures, and is suitable for high-pressure and high-temperature applications.
4. How is maintenance performed on these valves?+ Maintenance typically involves inspection of the disc, seat, and gasket; the pressure seal bonnet can be disassembled for servicing.
5. What materials are used in these valves?+ Typically carbon steel, alloy steel, stainless steel, and sometimes special alloys for corrosion or temperature resistance.

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