The relief valve is on the boiler, pressure vessel and other pressure equipment important safety accessories. The relief valve ( Also known as relief valves) According to the pressure system working pressure ( Working temperature) Automatic opening and closing, general installation in a closed system of the equipment or piping safety protection system. When the equipment or pipeline internal pressure or temperature exceeds the relief Industrial Valves set pressure, automatic open pressure or temperature, ensure that the equipment and piping within the medium pressure ( Temperature) In the set pressure ( Temperature) Under, the normal work of the protection equipment and pipe, prevent accidents and reduce losses. Safety valve manufacturing industry in China after decades of development, production to achieve the substantial increase, when pressure exceeds allowable values in the relief equipment and pipeline, valve automatically opens, then the amount of emissions; When pressure is reduced to the specified value, the valve automatically shut down, to ensure the safe operation of the relief valve. Each kind of relief valve has its use value, in all walks of life provide a unimaginable role, directly caused by the relief valve industry scale expanding, this undoubtedly provide domestic companies with unimaginable market prospect. Many users must know the difference between it and other valve to protect the safety of equipment. Today, the relief valve is mainly used in steam boiler car tank lorry or liquefied petroleum gas (LPG), liquefied petroleum gas, production Wells, high pressure of steam generators in rail tanker bypass, pressure pipes, pressure vessels, etc. How to choose the right relief valve is directly related to use units of economic benefit and safety of operators and equipment, the main attention points: 1, determine the using condition of pressure rating. 2, according to the use of the environment and the condition of material, choose the reasonable structure of the relief valve. 3, select the appropriate nominal diameter. 4, determine the material of the relief valve. Emissions selection considerations: (1) of the relief valve must be greater than safety discharge capacity of the vessel. (2) the operating pressure of absolute stable container, should consider to choose raise safety valve ( Such as compressor cylinder) 。 (3) high pressure vessel, large containers, and in large volumes of water safety, low pressure container, had better choose the rev safety valve ( Such as the reaction kettle equipment) 。 The opening height of the relief valve is to point to: the disc from actual lift is in the closed position the valve core to leave the seat of the big height: 1, the general gas piping with full rev type, liquid tube with a tiny qi road. 2, working temperature is lower than the standard boiling point with full and type of media. 3, recommendation of oxygen medium type. Rev. All safety valve: when the static pressure at the entrance of the relief valve to set pressure, the disc quickly rose to great heights, great limits of surplus materials. Commonly used for compressible fluid. Disc rising height not less than a quarter of throat neck. Raise safety valve: when the static pressure at the entrance of the relief valve to set pressure, the disc position with the increase of inlet pressure and proportional rise, large extent reduce material should be ruled out. Generally used for incompressible fluid. Disc large rise height not less than 1/20 of the throat neck - — 1/40. Safety valve for clean, no particles, low viscosity fluid. Who must install safety relief devices and are not suitable for the installation of safety valve, or the relief valve should be installed blasting and blasting series applies.
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The major classifications of are resilient seated valve, cast iron valve, resilient gate valve and resilient valve machines.