pilot operated relief valve is a safety valve, the open-close part under the action of external force in a normally closed state, when the equipment or piping within the medium pressure increases, more than a specified value automatically when open, through a discharge medium system to prevent the pipeline or equipment within the medium pressure in excess of the prescribed value. Pilot operated relief valve is widely used in natural gas, liquefied petroleum gas (LPG) pressure vessels and chemical equipment and industrial pipes, fire explosion proof, antistatic, reliable sealing, opening and closing fast and large displacement of outstanding advantages. Pilot operated relief valve structural characteristics of pilot operated relief valve consists of the main valve, pilot valve, relief valve, connector and ducts, etc. Under normal conditions, the system of medium pressure is applied to the main valve disc in the lower part, and on the top of the main valve disc. Due to the main valve disc air chamber above the area below the area in the medium, medium under the action of pressure difference, the main valve in the closed state. As the pipeline medium pressure rising, the sealing of seal pressure with will also rise, the safety valve and spring directly load on the contrary, the medium pressure, the higher the more reliable. When the pipeline medium pressure abnormalities, meet or exceed the setting pressure, pilot valve ( FIG. 2) On disc quickly open, above the main valve disc through the pilot valve exhaust gas indoor medium joint discharge rapidly, the main valve disc below medium pressure under the action of strong, instantaneous open, the medium from the main valve outlet quickly a large number of discharge, medium in the pipeline pressure returned to normal work, ensure the security of the system. When the pipeline medium pressure dropped to about 90% system setting of the relief Industrial Valves setting pressure, the pilot valve on the valve closed, pipeline interface and through pilot valve into the main Industrial Valves at the top of the chamber. Under the action of pressure difference, the main valve closed, guarantee the normal work of the system. Pilot operated relief valve working principle of the pilot valve consists of body, disc, plunger, deflated joint, on disc, spring and relief valve, etc. Under normal conditions, the pilot valve disc in the closed state, pilot valve under the valve is fully open. Pipeline medium through the disc into the disc at the top of the indoor gas, to close the main valve disc. When the pipeline medium pressure is unusual, meet or exceed the whole concentration set, pilot valve under the valve in the closed, under the action of medium pressure to cut off the pipeline medium into the main valve at the top of the channel, at the same time pilot valve disc was plunger jacking, namely the pilot valve open, above the main valve disc through the vent gas of indoor medium joint discharge quickly. Primary disc below medium pressure under the action of strong, instantaneous open, the pipeline medium from the main valve outlet quickly a large number of discharge, the pipeline medium pressure returned to normal work, ensure the safety of the system. When the pipeline pressure drop to system set by the setting pressure of about 90%, the pilot valve on the disc to close under the action of the spring, at the same time under the pilot valve disc was open plunger, pipeline medium through the disc into the disc at the top of the air chamber, the main valve disc in the closed under the action of pressure difference, ensure the normal operation of the system. When the pipeline medium pressure abnormality, but failed to open, pilot valve failure can be manually play enlightens the relief valve on the valve, the release of the main valve disc of indoor gas above the medium, to open the valve flap of the Lord, the release of the pipeline medium abnormal pressure and guarantee the safety of the system. Pilot operated relief valve installation requirements ( l） Rated capacity greater than zero. 5 t/h boiler, installed at least two pilot operated relief valve: rated evaporation is less than or equal to zero. 5 t/h boiler, install a relief valve at least. Split the economizer exit, steam superheater outlet must be installed pilot safety valve. （ 2) Pilot operated relief valve should be installed vertically in the pot, the top of the header. Between the relief valve and the drum or header, shall not be equipped with access steam outlet pipe and valve. （ 3) Pilot operated relief valve to prevent heavy hammer to mobile devices and on its own limitation lever deviant guide frame, the spring safety valve to have raise a hand and prevent twisted casually adjusting screw of the device. （ 4) For the rated steam pressure is less than or equal to 3. 82 mpa boiler, pilot operated relief valve throat diameter should not less than 25 mm: rated steam pressure is greater than 3. 82 mpa boiler safety valve throat diameter should not less than 20 mm. （ 5) Pilot operated relief valve and connecting pipe of boiler, its cross-sectional area should not be less than import cross-sectional area of the relief valve. If several common relief valve installed in a short tube attached directly to the drum, the access of the short tube cross-sectional area should not step in all safety valve exhaust steam area 1. 25 times. （ 6) Pilot operated relief valve should be installed commonly exhaust tube, exhaust steam pipe should be direct safety, and have enough area, ensure the exhaust steam flow. At the bottom of the relief valve exhaust pipe should be put on AIRS have received safety drain pipe, on the exhaust pipe and drain pipe, are not allowed to furnish the valve. Valves have been response national policy and called for, committed to researching, developing and manufacturing electric butterfly valve, stainless steel ball valve, discharge valve, electric gate valves, stainless steel gate, stainless steel valve, stainless steel check valve, high pressure gate valves high-quality let customer trust of good valves, valve valve industry is willing to do a little. 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