Safety Shut-Off Valve (SHV) measures the pressure at the downstream of a gas regulator with a help of an impulse line. In case, a high-pressure surge is developed in the gas line installation, this Safety Shut-Off Valve immediately closes with the force of a spring. The closing spring is adjustable for different pressure ranges and can be set according the operating pressure conditions in the gas line installation. Unless the manual lever is pulled up, the SHV cannot be brought back in the operation. SHV operates only in one way. Suitable for pressure up to 4 bar for size 25 mm to 100 mm. Response pressure up to 500 millibar.