| 摘要 |
A fluid pressure operated valve includes a housing into which fits an expansible membrane. The housing is formed with an input aperture and an output aperture each respectively closable by one of a pair of movable flaps. The membrane is coupled to the fluid pressure the application of which causes the expansion of the membrane. This expansion can be controlled to provide on the one hand, regulation of the flow through the valve. Or, on the other hand, the expansion can drive the flaps fully across their respective apertures and cause the membrane to sealingly engage the housing interior to block fluid flow through the valve.
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