Specializing in the production of various breathing valve HXF

Under the "fire protection design of petrochemical enterprises" (GB50160-92) of national standards: "Save A and B liquid fixed roof tanks, flame arrester should be located and breathing valve." Visible breathing valve, flame arrester tank is not lack of security infrastructure. It can not only maintain the pressure balance tank, make sure the tank from damage during over-pressure or vacuum, and can reduce evaporation and loss of the tank medium. I produced the breathing valve, with a compact, ventilation volume, leakage, good sealing performance characteristics. The main technical parameters: Suitable for petroleum, chemical, pharmaceutical, energy, special materials such as liquid or gas. Operating pressure: A, -295Pa (-30mmH2O) / + 355Pa (+ 36mmH2O) B, -295Pa (-30mmH2O) / + 980Pa (+ 100mmH2O) C, -295Pa (-30mmH2O) / + 1750Pa (+ 180mmH2O) D, -295Pa (-30mmH2O) / + 98000Pa (+ 10000mmH2O) Explosion levels: can refer to GB50058-92. Body material: carbon steel, aluminum, stainless steel: SUS304, SUS304L, SUS316, SUS316L. Valve disc, seat material: aluminum, stainless steel. Seal material: PTFE. Connection: flanged and threaded connections. Flange Standard: when HG20592, as customers need GB, SH, HGJ, JB, ANSI, JIS and other standards or changes in pressure levels, please indicate in the contract. Manufacturing, testing standards: Press (oil tank breather valve) SY7511-87, (oil storage tank flame arrester and test methods) GB5908-86 and other standards for manufacturing and inspection, or customer specified standards. [Maintenance] to (fire retardant) breathing valve is safe to use, should periodically corrugated fire resistant layer removed within 3-6 months, clean, ensure fire resistant layer on each hole open and prevent clogging, to ensure safety normal use. Periodic inspection through the atmosphere positive and negative valve disc movement is flexible, the guide rod and the valve disc contacts the sealing surface for damage, if damaged should be immediately replaced. In the inspection, maintenance, re-installation, should ensure that the joint surface of each valve tight fit, flexible disc lift. When the new valve is enabled, should be installed before removing the flange cover, remove the valve disk between shock was otherwise breathing valve failure.