Can you provide information on the testing requirements specified in ball check valve?

Here are some key testing requirements for ball check valve typically specified in standards like API 598 and MSS SP-126:


Seat Leakage Test 


Measures leakage through the ball and seat interface with pressure applied in the closed position. Leakage rate must not exceed the specified maximum (often around 5 mL/min/in of nominal pipe size).


Hydrostatic Shell Test


Valve body is pressurized to 1.5 times the valve rating to check for leaks and structural integrity. Must hold pressure steadily for a specified duration.


Back Pressure Test


Tests ability of the valve to hold upstream pressure with a given back pressure applied downstream. Must maintain a tight seal.


Cycling Test


Valves are fully cycled open to closed numerous times (often 500+ cycles) to ensure smooth operation throughout its motion.



Flow Performance Test


Measures the pressure drop across the valve at various flow rates. Generates a flow coefficient (Cv) value.


Cryogenic Testing


For cryogenic service, the valve may be tested at extremely cold temperatures to verify operability.


Positive Material Identification


Critical components are tested to validate proper materials used in construction, like PMI testing of welds.


Dimensions


Critical dimensions are verified to comply with required specifications and tolerances.


Ball check valves must pass these and other applicable tests to ensure they meet design specifications and are suitable for their intended service conditions.


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