Hardware【Keep improving】Metal spiral wound gasket

It is usually made of high-quality SUS304, SUS316 ('V' or 'W' shape) and other stainless steel winding tapes and graphite, asbestos, PTFE, non-asbestos and other soft materials alternately and overlapped spirally. Use spot welding to fix the metal belt. Basic metal wound gaskets without inner and outer rings are generally used in medium and low pressure tongue and groove surfaces and flat or concave-convex flanges. Performance characteristics: Spiral wound gasket has good compression performance, good resilience, multi-channel sealing and certain self-tightening function. It is not sensitive to the surface defects of the flange pressing surface, and it can be partially eliminated if it does not adhere to the flange sealing surface. The influence of pressure, temperature changes and mechanical vibration; it can maintain its excellent sealing performance under various harsh conditions such as high temperature, low temperature, high vacuum, shock vibration and so on. Equipment used: pipelines, valves, pressure vessels, condensers, heat exchangers, towers, manholes, hand holes, etc. in petroleum, chemical, metallurgy, electric power, shipbuilding, gas, nuclear energy, aerospace, textile, medicine, machinery and other industries The static sealing part of the flange connection. Basic type code applicable flange sealing surface thickness (mm) V type basic body/ring W type basic body/ring basic type A or R type tongue and groove surface, concave and convex surface, flat surface and groove surface 3.2; 4.54.8; 5.5 ;7.5 with inner ring type B or RIR type tongue and groove surface, concave and convex surface, flat and groove surface 3.2/24.5/34.8/3.05.5/4.07.5/5.0 with positioning ring type C or CG type flat or convex surface Ring and positioning ring type D or CGI type flat or convex material: 1. Basic winding metal belt A. Use cold-rolled steel belts such as sus304, sus316L, and sus321 with a thickness of 0.15mm~0.25mm, or negotiated by the supplier and the demander . B. The metal belt is a pre-formed V-shaped or W-shaped narrow belt, and the surface should be smooth, clean, and free of roughness, cracks, scratches, pits and rust spots. C. The hardness value of stainless steel is HV≤200 2. Basic Type winding non-metallic tape A Non-metallic filling is special asbestos tape, flexible graphite tape, polytetrafluoroethylene tape, non-asbestos fiber tape, and mica tape. The thickness of the belt is 0.3-1.0mm. B. The loss on ignition of the special asbestos must be ≤25% C. The chloride ion content of the non-metallic tape is ≤100PPM D. The recommended temperature and pressure of various media and various non-metallic tapes are as follows: Spiral wound gaskets of various non-metallic materials Main technical parameters: Material identification code Temperature ℃ Maximum working pressure Applicable medium compression rate% Resilience rate% Stress relaxation rate% Expanded graphite FG-220--550250 BAR Corrosive medium 18-30≥17≤18 Special asbestos tape ASB -150--450 100 BAR-like air tightness 18--30≥19≤28 Polytetrafluoroethylene PTFE-200-- 250 100 BAR Corrosive medium 18--30≥15≤13 Non-asbestos material NAF-100--350 100 BAR General air tightness 18-30≥19≤28 Mica MICA-150--800 100 BAR Ultra high temperature 18-30≥19 Ceramic CER-200-1090100 BAR Ultra high temperature 18--40≥19 The following table is used for internal Material selection of ring and winding metal belt: Material name abbreviation mark Hardness (HB) Temperature (°C) SUS 304304130~180-195~+550SUS 316L316L130~180-100~+550SUS 321321130~190-195~+760HASTELLOR-B2HASTB215- 185~+1090 INCONEL-600INC600150-100~+1090MONEL-400MON150-130~+820 Titanium T2215-195~+1090 Metal spiral wound gasket basic body thickness tolerance: item thickness (mm) tolerance (mm) gasket thickness 4.5, 3.2+ 0.2-0.1 ring thickness 3.0±0.25 The following table is the diameter tolerance of the spiral wound gasket (namely the nominal pipe diameter used for the flange): DIN (mm) ANSI B16.5BS1560 (mm) Mss sp-44API 605 tolerance inner ring inner diameter gasket Inner diameteru003d26' and 600 and 24' and u003d36' and 800 and 34' and 1600>60'±1.6 Gasket outer diameter600 and 24' and 24 'and 60'±2.2 Outer ring outer diameter>u003d1/2' and 600 and 24' and 1000 and 34' and