Pressure relief of the volume of containers is the pressure vessel overpressure to ensure that the pressure is no longer rising, the amount of gas must be released within a unit of time. The selection of liquefied gas valve should be considered from the following aspects: (1) the structure of the type of choice of what type, mainly depends on the equipment's process conditions and working medium characteristics. If the container of the working medium toxic, flammable, then use a closed safety valve. Boilers and high pressure vessels and large volume of safe discharge but not too thick wall of the rich, low pressure vessels are the best choice of all Kai safety valve. Valve for liquefied gas (2) Pressure range The safety valve is designed and manufactured according to the standard series of nominal pressure. Each valve for liquefied gas has a certain working pressure range. Selection should be based on the maximum allowable working pressure of the boiler and pressure vessel selection of the appropriate safety valve. (3) The liquefied petroleum gas valve used for the emission should have a displacement of more than the safe discharge of the equipment so as to ensure that when the boiler or pressure vessel is over-pressured, part of the medium can be discharged in time to prevent the pressure inside the vessel from rising continuously.

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