Sealing gasket is a kind of sealing spare parts used in machinery, equipment and pipelines as long as there is fluid, and it is a sealing material. Sealing gaskets are made of metal or non-metallic plate materials through cutting, stamping or cutting processes, and are used for the sealing connection between pipes and the sealing connection between parts of machinery and equipment. According to the material, it can be divided into metal sealing gasket and non-metallic sealing gasket. Metal gaskets include copper gaskets, stainless steel gaskets, iron gaskets, aluminum gaskets, etc. Non-metallic gaskets include asbestos gaskets, non-asbestos gaskets, paper gaskets, rubber gaskets, etc.

Classification:

High, medium and low pressure asbestos rubber sheet gasket

Asbestos rubber gaskets are made of asbestos fiber and rubber as the main raw materials, supplemented with rubber compounding agent and filler, and are made through mixing, hot roll forming, vulcanization and other processes. Asbestos rubber gaskets can be divided into ordinary asbestos rubber gaskets and oil-resistant asbestos rubber gaskets according to their formula, process performance and application. According to the temperature and pressure used, it can be divided into low-pressure asbestos rubber gaskets, medium-pressure asbestos rubber gaskets and high-pressure asbestos rubber gaskets. It is suitable for the sealing of water, water vapor, oil, inert gas, medium acid and alkali. Asbestos gaskets are mainly used in the sealing of high, medium and low pressure flange connections.

Oil resistant asbestos rubber gasket

Features:

Oil-resistant asbestos rubber gaskets are refined from high-quality asbestos fibers, oil-resistant fibers, fillers, colorants, etc., and are widely used in pipelines and equipment in petroleum and chemical industries. Corresponding models can be selected according to working conditions.

Applications:

Oil-resistant asbestos gaskets: mainly used for sealing of steam, hydraulic, gas, oil solvents and non-aggressive media.

Rubber mat

Widely used in national defense industry and civilian industry, its characteristics are: high temperature resistance, ozone resistance, natural aging resistance, vacuum resistance, fuel oil resistance, lubricating oil resistance, strong oxidant resistance, chemical resistance and good electrical insulation performance.

PTFE lined rubber pad

The PTFE-lined rubber gasket is a composite rubber gasket wrapped with PTFE. With strong anti-corrosion performance and high sealing resilience, it is suitable for anti-corrosion sealing of low-pressure chemical equipment such as enamel and glass pipes.

Asbestos free gasket

Asbestos-free gaskets are roughly divided into non-asbestos rubber sheet gaskets and asbestos-free sheet gaskets according to their formula, process performance and use. The asbestos-free sealing gasket series made by calendering or copying process, because the asbestos-free gasket series not only has high strength, but also has good resilience, and at the same time has super anti-penetration performance, Therefore, they are excellent environmental protection gaskets to replace asbestos gaskets in the field of automobiles and industrial machinery.

Gasket installation requirements:

1. The sealing surface of the gasket and the flange should be cleaned, and there must be no scratches, spots and other defects that affect the sealing performance of the connection.

2. The outer diameter of the sealing gasket should be smaller than that of the flange sealing surface, and the inner diameter of the sealing gasket should be slightly larger than the inner diameter of the pipe. The difference between the two inner diameters is generally twice the thickness of the sealing gasket to ensure that the sealing gasket will The inner edge will not protrude into the container or pipe, so as not to hinder the flow of fluid in the container or pipe.

3. The pretightening force of the sealing gasket should not exceed the design specification, so as to avoid the excessive compression of the sealing gasket and the loss of rebound ability.

4. It is best to use a torque wrench when the gasket is pressed tightly. For large bolts and high-strength bolts, it is best to use hydraulic tensioners. The tightening torque should be obtained through calculation according to the compression of the given sealing gasket, and the oil pressure of the hydraulic tightener should also be determined through calculation.

5. When installing the sealing gasket, the nuts should be tightened in sequence. But it should not be screwed once to reach the design value. Generally, it should be cycled at least 2~3 times so that the stress distribution of the sealing gasket is even.

6. For pressure vessels and pipelines with flammable and explosive media, safety tools should be used when replacing gaskets to avoid sparks caused by tools colliding with flanges or bolts, resulting in fire or explosion accidents.

7. If the pipeline leaks, it must be depressurized before replacing or adjusting the installation of the sealing gasket, and it is strictly forbidden to operate under pressure.