8.2. Check valves
Check valves are automatic valves that open with forward flow and close against reverse flow. They are also known as non-return valves. Check valves shall operate in a manner that avoids:
• The formation of an excessively high surge pressure as result of the valve closing.
• Rapid fluctuating movements of the valve closure member.
The type and operating characteristics of which can influence the choice of check valve type. Suitable combinations are:
• Swing check valve used with ball, plug, gate, or diaphragm control valves.
• Tilting disc check valves similar to swing-type check valve but with a profiled disc.
• Lift check valve used with globe or angle valves.
• Piston check valve used with globe or angle valves.
• Butterfly check ...
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