Description: One-way exhaust-end sealing wear part, fitted onto the exhaust-port valve seat to govern unidirectional gas discharge.
Opens and closes automatically in response to the pressure differential across the pump chamber. Lifts under elevated compressed-gas pressure for gas discharge; re-seats against the valve seat when pressure drops, preventing reverse gas back-flow and securing vacuum performance.
Stainless steel, fluoroelastomer (FKM) or PTFE thin-sheet construction. One end fixed, opposite end free-flexing; forms sealing contact with the mating valve-seat face.
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