Relief valve p.max 1,5bar

The relief valves are safety devices that discharge a certain amount of gas to the outside when the pressure at the control point exceeds the set pressure (bubble breaking pressure) due to non-lasting events such as valve closure. shut-off in a very short time and / or overheating of the gas with zero required flow rate. the exhaust of the gas to the outside can, for example, avoid the intervention of the blocking devices for transitory reasons not deriving from damage to the reducers. Obviously the quantity of gas discharged depends on the extent of the overpressure with respect to the calibration. The operating principle of these safety devices is based on the comparison between the thrust on the diaphragm or piston deriving from the pressure of the gas to be controlled and the thrust deriving from the calibration spring. Obviously, the weight of the mobile crew, the static thrusts and the residual dynamic thrusts on the armed pad also intervene in this comparison. When the thrust deriving from the gas pressure exceeds that of the spring, the shutter is raised with consequent discharge of a certain quantity of gas; otherwise the obturator is released and closes the valve seat under the thrust of the gas pressure to be checked only and not of the setting spring. In this way, damage to the reinforced pad due to incorrect maneuvers of the calibration adjustment nut is avoided.