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Air compressor has a spring loaded relief valve and the bar type two kinds big. Another impulse safety valve, pilot operated relief valve, safety valve switch, security, decompression valve, static weight type relief valve, etc. Spring loaded safety valve rely mainly on the spring force and work, spring loaded relief valve is closed and not closed, inflammable, explosive or toxic medium should choose enclosed, steam or inert gas and so on can choose is not closed, the spring safety valve with a wrench and not with a wrench. Lever type relief valve relies mainly on the lever and weight and the power of the work, but as a result of lever type relief valve bulky tend to limit the scope to choose. Higher temperature when choosing safety valve with radiator.
Relief valve as the name suggests is the key of pressure pipeline and pressure vessel safety application security, in order to guarantee the normal work of the safety valve and prolong the service life of the relief valve, in use should be regularly check whether the running safety valve leakage, jam and spring abnormal phenomenon such as corrosion, and observe the adjusting and regulating ring tight set screw a screw lock nut loose, if found the problem in a timely manner appropriate maintenance measures are taken. There should be safety valve will be removed on a regular basis to conduct a comprehensive cleaning, check and regrinding, setting the rear can be used again. Installed in outdoor safety valve to take appropriate protective measures, to prevent the rain, fog, dust, rust stains and dirt into the relief valve and discharge line, when the environment is below zero degrees centigrade, also necessary antifreezing measures should be taken in order to ensure the reliability of the safety valve action. This valve shall generally be in accordance with the conditions properly installed in the pipeline.
Main parameters of air compressor valve is displacement, the displacement is determined by the height of the calibre of the valve seat and valve disc to open, from open height is different, is divided into tiny qi type and full rev. Type two kinds. Micro rev. Type refers to the opening height of the disc seat throat diameter 1/40 ~ l / 20. The rev. Type refers to the opening height of the disc seat throat diameter of a quarter.
Is determined by the operating pressure of the relief valve, nominal pressure, is determined by the operating temperature of the relief valve using temperature range, the relief valve set pressure value calculated by spring or leverage constant pressure range, according to determine the relief valve using medium material and structure, then according to the safety valve relief valve discharge volume calculated throat diameter. The following general rules for safety valve is chosen.
(l) hot water boiler with normally closed micro and safety valve with a wrench.
(2) steam boiler or steam pipe with normally closed with a wrench and all safety valve.
(3) the liquid incompressible medium such as water with normally closed and safety valve, or use the safety relief valve.
(4) high pressure feed water with normally closed all rev. Safety valve, such as high pressure feed water heater, heat exchanger, etc.
(5) the gas compressibility, such as dielectric with normally closed and safety valve, such as gas storage, gas pipeline, etc.
(6) E dead weight is commonly used in steam boiler safety valve.
(7), large diameter, large displacement and high pressure systems generally use impulse safety valve, desuperheating decompression device, power plant boiler, etc., as shown in figure 8.
(8) train transport liquefied petroleum gas tank car, car, tank car, tank, etc. General use built-in safety valve, as shown in figure 4.
(9) at the top of the tank general use hydraulic pressure relief valve, should be used with breather valve.
(10) underground drainage or gas pipeline workers generally use pilot operated relief valve, as shown in figure 6.
(11) liquefied petroleum QiZhan liquid-phase reflux tank pump discharge line generally use safe backflow preventer.
(12) negative pressure or operation may produce negative pressure system commonly used in the process of vacuum negative pressure relief valve.
(13), back pressure containers of volatile and toxic flammable or bellows valve is commonly used in piping system.
Example: A28X - 16 T air compressor valve 8 said said male 2 A for the relief valve connection is not closed fully rev type X said valve seat sealing surface for the rubber 16 said nominal pressure 1.6 Mpa T said material is copper
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