| 摘要 |
A push-button operated valve having an optional metering control for regulating the open state of the valve includes optional pneumatic actuation in response to a source of either pressure or vacuum while retaining the metering capability. A plurality of diaphragms, responsive to either mechanically induced or pneumatically induced forces, relocate a magnet for magnetically opening the valve to permit fluid flow therethrough and for controlling closure of the valve in response to the presence of the metering control, which metering control has an adjustable response period.
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