COMBINED CHECK VALVE AND PRESSURE SENSOR

摘要

A check valve, for use in a vacuum accumulator. The check valve includes a movable gate (G), which blocks fluid flow. The gate carries a first electrical contact (C1), which mates with a second electrical contact (C2), when the gate closes, thereby issuing a signal which indicates closure. The invention eliminates the need for a separate pressure sensor, for sensing pressure within the accumulator.