How is the sealing gasket installed?

Sealing gasket is a kind of sealing spare parts often used in machinery and equipment, and it is a kind of sealing material. From this definition, it is not difficult for us to know how important the sealing gasket is, so how to install the sealing gasket is worthy of our attention. Correct installation can ensure the sealing performance and make the equipment run smoothly, otherwise it will damage the sealing gasket. Next, let’s take a concrete look at what we should do.

How is the sealing gasket installed?

The correct installation of gasket should be carried out when the flange connection structure or threaded connection structure, static sealing surface and gasket have been inspected and other valve parts are intact.

  • 1. Before installing the gasket, the sealing surface, gasket, thread and the rotating part of bolt and nut shall be coated with a layer of graphite powder or lubricating agent mixed with graphite powder and engine oil (or water), and the gasket and graphite shall be kept clean.
  • 2. The gasket shall be installed on the sealing surface in the middle and correct position, and shall not deflect, extend into the valve chamber or lay on the shoulder.
  • 3. Only one piece of gasket is allowed to be installed, and two or more pieces are not allowed to be installed between the sealing surfaces to eliminate the insufficient clearance between the two sealing surfaces.
  • 4. The sealing of elliptical gasket shall make the inner and outer rings of gasket contact, and the two ends of gasket shall not contact with groove bottom.
  • 5. The installation of O-ring, in addition to the ring and groove should meet the design requirements, the amount of compression should be appropriate. On the premise of ensuring the sealing, the smaller the compression deformation rate, the better, can extend the life of O-ring.
  • 6. Before the gasket is on the cover, the valve should be in the open position, so as not to affect the installation and damage the valve. The cover shall be aligned with the position, and shall not be pushed or pulled to contact with the gasket, so as to avoid displacement and abrasion of the gasket.
  • 7. The gasket connected by bolt or thread shall be installed in a horizontal position (for gasket cover connected by thread, pipe wrench shall not be used if there is wrench position).
  • 8. Before the gasket is compressed, the pressure, temperature, medium property and gasket material property shall be understood clearly to determine the preload. The preload should be reduced as far as possible without leakage during pressure test.
  • 9. After the gasket is tightened, it is necessary to ensure that there is a pre tightening clearance for the connector in case of gasket leakage.
  • 10. When working at high temperature, the bolt will produce high temperature creep, stress relaxation and deformation increase, which will lead to gasket leakage and need hot tightening; On the contrary, under low temperature, the bolt will shrink and need to be loosened.
  • 11. When liquid sealing gasket is used for sealing surface, the sealing surface shall be cleaned or surface treated. The plane sealing surface should match after grinding, the coating adhesive should be uniform, and the air should be excluded as far as possible. The adhesive layer is generally 0.1-0.2mm.
  • 12. When polytetrafluoroethylene film tape is used for thread sealing, the starting point of the film should be thinned and glued on the thread surface, and then the excess tape at the starting point should be removed to make the film glued on the thread wedge.

Through the above introduction, we know how to install the sealing gasket. The installation is not complicated, but there are many details that need to be paid attention to. Once the details are handled, the installation will be smooth. The correct installation or not is related to the sealing and operation of the equipment, so the installation operators should keep the above matters in mind, and carefully check the installation work.

Source: China Gaskets Manufacturer – Yaang Pipe Industry (www.steeljrv.com)

(Yaang Pipe Industry is a leading manufacturer and supplier of nickel alloy and stainless steel products, including Super Duplex Stainless Steel Flanges, Stainless Steel Flanges, Stainless Steel Pipe Fittings, Stainless Steel Pipe. Yaang products are widely used in Shipbuilding, Nuclear power, Marine engineering, Petroleum, Chemical, Mining, Sewage treatment, Natural gas and Pressure vessels and other industries.)

If you want to have more information about the article or you want to share your opinion with us, contact us at sales@steeljrv.com

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