Valves with pneumatic chambers for reciprocating compressors are known as "damped valves" (ref; Fig. 1 and Fig. 2). These are capable of reducing hard impact force on the valve seat and valve stopper, which is one of the causes of damage to the valve plates and valve springs. Because of merits like this, damped valves are widely used. However, the specifications of the damped valves have been empirically decided, and their dynamic behaviour has not been examined in detail in a theoretical study.
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