Rückschlagventiluntergruppe und seine Verwendung in Differentialladerückschlagventile.

摘要

A differential loading fluid check valve (50), including a unitized valve body (43) having a single service port (48) in its sidewall for selective access to the interior chamber (46) of the check valve. Check valve subassemblies (58,62) are installed and removed through the service port for valve assembly and service. The same valve body can be configured for either single or double check valve operation by adding or removing check valve subassemblies. Each check valve subassembly (58,62) includes a base with an aperture, a pivotally mounted clapper (21), and an overlying pivotally mounted cam arm (31), spring biased against the movable end of the clapper. An arcuate surface on the cam arm is engaged by the clapper as it moves from a closed position to an open position, providing a beneficial differential reduction in the pressure drop, or loading, through the check valve.