Check Valve

The primary function of a check valve is to prevent back pressure in the process. A secondary function can be for isolation. Occasionally, flanged swing check valves are fitted with manual over-ride devices, to allow for positive shut-off without flow pressure assistance. In this case, energisation of the seat to seal interface is by mechanical force applied through an external hand lever.

Further Information
Check Valves - General Design Criteria
Standard Pressure Class Ratings / End Connections
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