The closed position of pinch valves can be monitored electrically with pressure switches or monitored with an optical position indicator (red = pressurized = pinch valve closed).
The photo shows a pinch valve QV-635 with solenoid valve and optical position indicator in pressurized state. The pinch valve is closed.
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![KVT pinch valve QV-635 with optical position indicator and solenoid valve KVT Quetschventil mit optischem Positionsanzeiger](https://www.k-vt.de/wp-content/uploads/2020/02/KVT-Quetschventil-mit-optischem-Positionsanzeiger-.jpg)