| 摘要 |
A valve assembly for a pumping apparatus includes a cylinder sleeve having a head end with inlet and outlet ports surrounded by a recess. An elastomer seal element is received in the recess and includes a peripheral portion that encircles the ports and a bridge portion that extends across the space between the ports. Integral flapper valves extend into the spaces between the peripheral portion and the bridge portion. A valve head with inlet and exhaust chambers has a flat surface that seats against the seal element. The cross-section of the peripheral and bridge portions are compressible, such as that of an O-ring.
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