Pressure Seal Swing Check Valve

For high-pressure and high-temperature process lines, a pressure seal swing check valve combines the automatic backflow protection of a swing check valve with a pressure-energised bonnet seal. As a Pressure Seal Swing Check Valve Supplier in Nigeria, African Valve supplies this type of valve for demanding applications where maintaining bonnet integrity under elevated pressure and temperature is important. African Valve lists pressure seal swing check valves within its check-valve range.

Why Pressure Seal Construction?

Unlike a conventional bolted bonnet, the pressure-seal arrangement uses system pressure to energise the internal sealing mechanism. As pressure increases, the sealing force can increase, making this construction particularly suited to high-pressure services. Pressure-seal swing check designs are commonly used in power generation, oil & gas, petrochemical and other high-pressure process applications.

Technical Specifications

Parameter	Typical Specification
Product Type	Pressure Seal Swing Check Valve
Operating Principle	Hinged Disc / Automatic Non-Return
Bonnet Design	Pressure Seal
Seating	Metal Seated
Pressure Class	Class 600–2500, depending on design
Nominal Size	Application- and design-dependent
End Connection	Flanged / Butt Weld
Flange Facing	RF / RTJ, where applicable
Flow Direction	Unidirectional
Testing	API 598 / Applicable Project Standard

Pressure-seal swing check valves are particularly associated with Class 600 and higher services, although the actual pressure range depends on the selected design.

Materials & Components

Body & Bonnet: ASTM A216 WCB Carbon Steel / WC6 / WC9 Chrome-Moly Alloy Steel / ASTM A351 CF8M Stainless Steel
Disc: Carbon Steel / Alloy Steel / Stainless Steel
Seat Ring: Stainless Steel / Hardened Alloy
Hinge & Pin: Stainless Steel / Alloy Steel
Pressure-Seal Ring: Carbon Steel / Stainless Steel, depending on design
Gasket / Sealing Elements: Graphite / Application-Specific Material
Bolting: ASTM A193 B7 / B16 / B8 / B8M, depending on temperature and material requirements

For high-temperature steam service, WC6, WC9 may be selected, while stainless-steel and specialised alloys can be considered for corrosive services.

Applications in Nigeria
The valve is particularly relevant to Nigeria's gas-processing facilities, refineries, petrochemical plants, power-generation facilities and high-pressure steam systems. In these services, the pressure-seal bonnet is useful where conventional bonnet sealing may become more demanding as pressure and temperature increase.
It can also be considered for high-pressure oil and gas pipelines and process systems where automatic reverse-flow protection is required.
Pressure-seal construction is not simply a higher-pressure version of every swing check valve. Pressure class, temperature, fluid, back pressure, flow velocity and required closing behaviour should be evaluated when selecting the valve.
Standards
Depending on the valve design and service, applicable standards can include BS 1868, API 6D and ASME B16.34. Face-to-face dimensions may follow ASME B16.10, end connections can be specified to ASME B16.5, ASME B16.47 or ASME B16.25, and pressure testing may follow API 598

Pressure Seal Swing Check Valve

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