Choose from our selection of thrust washers, including stainless steel PTFE thrust washer components.
Gasket sealing occupies a very important position in modern industrial enterprises, and the good or bad sealing is directly related to the continuity of production, safety of property, energy saving and environmental protection as well as people’s physical and mental health, so the development of washer is getting more and more attention. With the rise of modern industry, especially the petroleum and chemical industries, atomic energy industry and large power stations, pressure vessels are developing in the direction of high temperature, high pressure, high vacuum, deep cooling and large size, multi-series, which constantly put forward new requirements for gasket sealing, and various new materials and structures are emerging, and their sealing performance is also very different. In addition, pressure fluctuation, temperature change, bolt preload slack, flange tilt, misalignment, sealing surface defects, media corrosion will have a great impact on the sealing effect. Therefore, how to correctly select the appropriate gasket according to the working conditions and how to correctly install is the key to ensure the sealing effect. 
Important factors influencing gasket selection Gasket selection is not an easy task, especially in the selection of gasket sealing material, many factors have to be considered. The variables that occur at the flange connection are seemingly endless, and all of these uncertainties affect the gasket’s sealing effectiveness. In the past, the parameters “TEMP” (temperature, application, medium, pressure) seemed to be sufficient. But today, the quality of the flange machining, the amount of bolt fillet embedment, the flange rotation, the bolt tensioning, the filler of the medium and the flange surface treatment all influence the gasket sealing effect. Therefore, various parameters must be considered in order to make an appropriate selection.
In most selection processes, the temperature of the fluid is the primary consideration. This will quickly narrow the selection range, especially when going from 200°F (95°C) to 1000°F (540°C). When the system operating temperature reaches the maximum continuous operating temperature limit for a particular gasket material, a higher grade of material should be selected. This should also be the case in certain low temperature situations.
The most important parameters in the application are the type of flange and the bolts used. The size, number and grade of the bolts in the application determine the payload. The effective area to be compressed is calculated from the gasket contact dimensions. From the load of the bolts and the contact surface of the gasket the effective gasket sealing pressure can be derived. Without this parameter, it will not be possible to make the best choice among the many materials available.
(3) Washer supploer
There are thousands of fluids in the medium, and the corrosiveness, oxidation, and permeability of various fluids vary very much. Selection must be based on these characteristics when selecting materials. Also the cleaning of the system must be taken into account to prevent the erosion of the gasket by the cleaning fluid.
Each gasket has its own maximum pressure limit, and the pressure-bearing capacity of the gasket decreases with the increase of the material thickness, the thinner the material, the greater the pressure-bearing capacity. The selection must be based on the pressure of the fluid in the system. If the pressure often fluctuates drastically, it is necessary to know the details in order to make a choice.
(5) PT value
The PT value is the product of pressure (P) and temperature (T). Each gasket material has a different pressure resistance at different temperatures and must be considered. In general, the manufacturer of the gasket will give the maximum PT value of the material. 
Asbestos rubber sheet washer
Asbestos rubber sheet washer are made of asbestos fibers, rubber as the main raw material supplemented with rubber compound and filler, through the process of mixing and stirring, hot roll forming and vulcanization. Asbestos rubber washer can be divided into common asbestos rubber washer and oil resistant asbestos rubber washer according to their formulations, process performance and applications. According to the temperature and pressure, they can be divided into low pressure asbestos rubber washer, medium pressure asbestos rubber washer and high pressure asbestos rubber washer. Suitable for sealing water, water vapor, oil, solvent, medium acid and alkali, asbestos washer are mainly used in the sealing of medium and low pressure flange connections.
Oil resistant asbestos rubber washer are made of high quality asbestos fiber, oil resistant fiber, filling material, coloring agent, etc. They are widely used in pipelines and equipment of petroleum and chemical industries.
Oil-resistant asbestos washer: mainly used for sealing steam, hydraulic, gas, oil solvent and non-aggressive media.