Pump, valve, flange metal gasket how to choose

Pipes, valves, flanges, pumps, pipe fittings, fasteners, seals and other equipment installation connection, the gasket is a common seal connection parts, gasket material, type, form has a lot of, is often used in metal winding gasket used high quality SUS304, SUS316 ( “ V” Shape or & other W” Shape) Stainless steel coil, such as band and graphite, asbestos, ptfe, alternates with no soft material such as asbestos overlapping spiral wound and become, at the start and end with metal belt fixed spot welding way, basic metal winding gasket with no generally used in low pressure inside and outside the ring grooved surface and plane or concave and convex surface of the flange. A spiral wound gasket compression performance, performance characteristics, can good resilience, multichannel and certain self-tightening sealing function, less sensitive to surface defects on the surface of the flange clamp, non-caking flange sealing surface, can eliminate stress. The influence of temperature variation and mechanical vibration; In high temperature. The low temperature. High vacuum. Impact vibration cycle alternating all kinds of harsh conditions, such as maintain its excellent sealing performance. Second, the use of equipment of oil, chemical industry, metallurgy, electric power, shipbuilding, gas, textile, medicine, machinery industries such as pipelines, pumps, valves, pressure vessels, condenser, heat exchanger, tower, manhole, hand hole flange joint static sealing parts, etc. Three, winding gasket structure form and symbol and use the flange type: 4, material: 1. Basic winding metal belt A. The thickness of 0. 15mm~0. 25 mm, sus304, sus316L, sus321 cold rolled steel belt, or be determined by supply and demand both sides talks things over. B。 Metal belt for preforming V or W narrowband, surface should be smooth, clean, not rough, defects such as cracks, scratches, pits and rusty spot. C。 The hardness value of stainless steel HV≤ 2002. Basic non-metallic tape of A nonmetallic filling for special asbestos tape, flexible graphite belt, teflon belt, non asbestos fiber tape, and mica tape, etc. The thickness of the belt is 0. 3 - 1. 0mm。 B。 Special asbestos ignition loss must & le; 25% c。 Chlorine ion nonmetallic belt & le; 100 PPM five, metal winding gasket technical standards in China are: HG/T20610 - 2009 steel pipe flange with spiral wound gasket chemical system of HG/T20631 - Europe 2009 steel pipe flange with spiral wound gasket system GB/T4622 chemical America. 2 - Spiral wound gasket pipe flange with 97 national standards JB/T4719 - spacer size 92 tube and shell heat exchanger with winding pads machinery standard JB/T90 - 2015 piping flange with spiral wound gasket machinery standard JB/T4705 - 2000 the pressure vessel flange with six, metal graphite spiral wound gasket winding gasket main performance parameters: coefficient of winding gasket: m = 2. 5 - 4 winding gasket use pressure: & le; 25 mpa winding gasket used temperature: - 196℃- 700℃( Oxidizing medium is not higher than 600 ℃) Winding gasket than small preload pressure: y = 68 mpa.
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