RMG 703/704 Safety shut-off valves
Only when the outlet pressure is below (after release of pmax) or above (after release of pmin) the reset gap is needed, the valve stem is opened and closed by hand. The pressure of the safe device is controlled by the responsive double diaphragm mechanism via the measuring line and is compared to the reference values given by the spring power of the setpoint. The amplifier valve remains closed in normal operating conditions.
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