Sealing gasket, it is a kind of used for machinery, equipment, place is as long as there is a fluid with seal of spare parts, use of internal and external, plays a role of sealing material. Sealing gasket is metal or non-metal plate material, the cutting, stamping or cutting technology, used in sealing connection between pipe, machinery and equipment parts and seal connections between the parts. According to the material can be divided into metal and nonmetal sealing gasket sealing gasket. Metal is copper gaskets, stainless steel sheet, iron sheet, aluminum sheet and so on. Non-metallic have asbestos gasket, asbestos gasket, paper gasket, rubber gasket, etc.

High school low-pressure asbestos rubber gasket

  Asbestos rubber gasket, rubber as the main raw material with asbestos fiber coupled with rubber compound and filling material, through mixing mixing, hot roll forming and vulcanization process. Asbestos rubber gasket according to its formula, process performance and use of different, can be divided into ordinary asbestos gaskets and oil resistant rubber asbestos rubber gasket. Depending on the temperature and pressure was used can be divided into low pressure asbestos rubber gaskets, medium voltage asbestos rubber gaskets and high-pressure rubber gasket. Suitable for water, steam, oil, solvents, acid, alkali medium sealing, asbestos gasket is mainly used in medium and low pressure in the sealing flange connection.

Characteristics: the oil resistant rubber asbestos gaskets by asbestos fiber, oil resistant, filling material, coloring, such as refined but become, widely used in petroleum, chemical industry pipeline and equipment, can choose the corresponding grade model according to the working condition.

  Application: apply to oil resistant asbestos gasket: mainly used for steam, water, gas, oil solvent and no corrosive medium sealing.

  Characteristics: the cylinder gasket by asbestos fiber, oil resistant, filling material, coloring, such as refined but become, widely used in automobile, motorcycle engine cylinder, can choose the corresponding grade model according to the working condition.

  Non asbestos plate gasket

    Non-asbestos gasket (no asbestos gasket) is based on aramid fiber, etc organic fiber and plant fiber and NBR, inorganic minerals calender and sealing materials at high temperature, due to containing asbestos fiber, rarely apply for asbestos gasket non-asbestos gasket replacement products. Non-asbestos gasket (no asbestos gasket) has high strength, and good resilience, at the same time, it has strong resistance to permeability is in high temperature and high pressure to replace asbestos gaskets under good environmental protection material.  

  Mould pressing, and other auxiliary materials with asbestos cloth used in corrosive high-temperature high-pressure sealing. Used in the reaction kettle, reaction cans, manhole, hand hole etc. Temperature: 100 ℃ to + 1000 ℃; Using pressure: PN < 5.0 Mp.

    A partial fluorine ethylene and trumpets, c fluorine, propylene copolymerization colloid elastomer material, widely used in national defense industry and civilian industry, its features are: high temperature resistance, ozone resistance, resistance to natural aging, vacuum, resistance to fuel oil, lubricating oil, resistant to strong oxidizer, drug resistance and electric insulation performance is good.

Ptfe rubber cushion that include line Ptfe bag lining rubber gasket is tetrafluoroethylene bag rubber compound gasket. Has strong anticorrosion performance and higher sealing resilience, suitable for low pressure chemical equipment such as enamel, glass pipe anticorrosion seal.

    1, GB4622.2-93 series spiral wound gasket pipe flange size

    2, GB9126.1-88 plane steel pipe flange with asbestos rubber sheet

    3, convex GB9126.2-88 steel pipe flange with asbestos rubber sheet

    4, concave and convex surface GB9126.3-88 steel pipe flange with asbestos rubber sheet

    5, GB9129-88 steel pipe flange with asbestos rubber gasket technology conditions

    6, GB9130-88 steel pipe flange connection with metal ring gasket technology conditions

7, HGJ70-91 steel pipe flange with flexible graphite composite gasket

    1, the sealing gaskets and flange sealing surface should be clean, must not have any impact on connecting sealing performance exists defects such as scratches, spots.

2, sealing gasket diameter should be smaller than outside the flange sealing surface, sealing gasket inside diameter should be slightly bigger than a pipe diameter, the inner diameter of poor generally take 2 times the thickness of the sealing gasket, to ensure that after compaction, sealing gasket point is not into the container or pipe, hampering the container or the flow of the fluid in the pipe.Should not exceed

    3, sealing gasket pre-tightening force design rules, so as to avoid excessive sealing gasket compression loss of ability to rebound.

    4, sealing gasket compression, it is best to use the torque wrench. For large bolts and high strength bolt, it is best to use hydraulic tensioning device. Tightening torque should be based on a given sealing gasket pressure obtained by calculation, hydraulic tensioning device the size of the oil pressure should also be determined by calculation.

    5, installing a sealing gasket, should be in order tighten nut. But should not twist once, to meet the design value. General should cycle at least 2 ~ 3 times, so that the sealing gasket stress distribution uniform.

    6, for flammable and explosive medium pressure vessels and piping, change security tools should be used when the sealing gasket, lest because tools into the flange and bolt, produce sparks, fire or explosion accidents.

7, pipeline leakage, if any, must be installed after antihypertensive treatment to replace or adjust the sealing gasket, it is forbidden to take pressure.

    1, install as suitable as tu plane flange seal winding gasket, attention should be paid to guarantee seal with concentric pipe, general with stiffening ring and the inside of the bolt circle faces to locate the contact, do not allow the eccentric installation. Install grooved face seal face of the flange of basic spiral wound gasket, consistent with the tank wall to keep clearance should be paid attention to.

    2, installation width narrow metal-coated gasket, a certain thickness of the steel plate should be placed on gasket lateral, compression flange, to avoid metal gasket of the packing after compression, the metal shell of the interface (or by) the bulge, damage the metal-coated gasket.

    3, when the flange working temperature higher than 200 ℃, between the flange sealing surface and sealing gasket sealant should be applied, in order to prevent the sealing gasket and flange sealing surface under high temperature sintering, add trouble to overhaul and replacement of sealing gasket.

    4, sealing surface not at ordinary times, can be coated on the surface of the sealing sealant before you install the sealing gasket. Sealant is general by manganese dioxide, red lead, graphite powder and boil after the flaxseed oil (drying oil). According to sealing medium, working temperature and medium pressure condition such as choosing appropriate type and brand of liquid sealant.

    5, for the installation of octagon ring gasket, metal when the metal ring gasket and flange seal groove processing is not very ideal, can achieve through the running-in fit closely. For large diameter of the metal ring gasket, running-in is relatively difficult, in order to fill the small metal surface uneven, can use sealant.