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The difference between a soft-seal butterfly valve and a hard-seal butterfly valve and the use of a butterfly-valve hard seal means that both sides of the seal pair are made of a metal material or a harder other material called a "hard seal". This seal has poor sealing performance, but High temperature resistance, wear resistance, good mechanical properties. For example: steel + steel; steel + copper; steel + graphite; steel + alloy steel; (the steel here may also be cast iron, cast steel, alloy steel may also be surfacing, spraying Alloy).
Soft seal: the side of the seal pair is made of metal material, and the other side is made of elastic non-metallic material. It is called "soft seal". This seal has good sealing performance, but it is not resistant to high temperature and easy to wear. Poor mechanical properties. For example: steel + rubber; steel + PTFE [wiki] polyethylene [/ wiki]; etc. The soft seal seat is made of non-metallic materials with certain strength, hardness and temperature resistance, and the sealing performance is good. Zero leakage can be made, but life and temperature are less adaptable. The hard seal is made of metal and the sealing performance is relatively poor, although some manufacturers claim to be able to make zero leakage. Soft seals can not meet the process requirements for a part of corrosive materials, hard seals can be solved! These two seals can complement each other, and the soft seal is relatively good in terms of sealing, but now the seal of the hard seal can meet the corresponding requirements! The advantage of the soft seal is that the sealing performance is good, and the disadvantage is that it is easy to age, wear, and has a short service life. The hard seal has a long service life, but the seal is relatively inferior to the soft seal.
The structural differences mainly include the following:
1. Structural difference: soft seal butterfly valves are mostly medium-line type hard seals, mostly single eccentric, double eccentric, triple eccentric butterfly valve
2, temperature resistance: soft seal for normal temperature environment. Hard seal can be used in low temperature, normal temperature, high temperature and other environments
3, pressure: soft seal low pressure - normal pressure, hard seal can also be used in medium and high pressure conditions
4, sealing performance: soft seal and three eccentric hard seal butterfly valve sealing performance is better, three eccentric butterfly valve can maintain a good seal in high pressure and high temperature environment.
In view of the above characteristics, the soft sealing butterfly valve is suitable for two-way opening and closing and regulation of ventilation and dust removal pipelines, water treatment, light industry, petroleum, chemical industry and other industries. Hard-sealed butterfly valves are mostly used for heating, gas supply, and gas, oil, acid and alkali environments.
With the wide use of butterfly valves, the features of convenient installation, convenient maintenance and simple structure have become more and more obvious. Electric soft sealing butterfly valves, pneumatic soft sealing butterfly valves, hard sealing butterfly valves, etc. have begun to replace electric gate valves and globe valves in more and more occasions. (Source: Othello Seal)
The aramid packing is woven from aramid fiber impregnated polytetrafluoroethylene emulsion and lubricant. Has good chemical resistance, high rebound, low cold flow. Has excellent high speed, high modulus properties (called artificial metal wire). Therefore, it can be used alone or in combination with other packings, as opposed to other types of packing, against particulate crystalline media and higher temperatures. A good asbestos replacement on the pump system.
device:
Pump, valve, rotating machine
industry:
Chemical, petroleum, pharmaceutical, food and sugar, pulp, paper and power industries.
medium:
Suitable for abrasive media containing solid particles, recommended for use in superheated steam, solvents, liquefied gases, syrups and other abrasive fluids.
Aramid fiber packing product specifications:
3×3mm--50×50mm; special specifications or various non-standard products can be formulated according to customer requirements.
Technical parameters of aramid packing:
Pressure (Pressure) 8-25Mpa
Temperature (Temperature) -100~280°C
Ph range (PH range) 2~12
Linear speed 0-15 m / s m / s
Hebei Innovation Sealing Material Co., Ltd. mainly produces PTFE molded plate, turning plate, high water-based packing, carbon fiber packing, asbestos fiber impregnated PTFE packing, PTFE packing, and polytetraethylene cutting wire packing. , PTFE expanded packing (black), PTFE packing, GFO fiber packing, high pressure high carbon fiber packing, high temperature and high pressure graphite packing, silicone core packing, aramid fiber packing, aramid carbon fiber Mixed packing, aramid PTFE mixed packing, aramid packing, expanded PTFE sealing tape, polytetrafluoroethylene film, PTFE raw material tape, flexible graphite material (graphite ring), Fluororubber sheet, silicone rubber sheet, metal graphite spiral wound gasket, tetrafluoroethylene strip, white mud sealing filler, black mud sealing filler, ceramic fiber product, PTFE liner lined straight tube series, fluorine-lined pipe fitting series, corrugated hose series , PTFE lining PTFE compensating tube, PTEE rotomolding PTFE lining series, PTFE PTFE valve series and so on.
stainless steel, sink strainer,fruit vegetable washing drain basket,kitchen tool,draining rack, draining basket.
Shenzhen Lanejoy Technology Co.,LTD , https://www.copper-nut.com