Boiler safety regulations in countries like America and India permit only non-assisted type safety valves. forged Gate, Globe, Check ValvesSpring loaded safety valves are popular. These springs are selected by safety valve designers to have high repeatability on set pressure and reseating pressure. Check ValvesAnother type of safety valve in use is the torsion bar safety valve, which are used by some boiler designers. In some countries like Germany, the use of assisted type safety valves is permitted. CHECK VALVESThe pressure raise is sensed by pressure sensors and the safety valve is opened to relieve the excess pressure.

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