Sealing gasket is a commonly used sealing spare part for machinery, equipment, etc. It is a material that plays a sealing role. Correct installation can ensure sealing performance and smooth operation of the equipment, otherwise it will damage the sealing gasket. Next, let's take a specific look at what to do.

The correct installation of gaskets should be carried out when the flange connection structure or threaded connection structure, sealing surface, and gasket have been inspected without any doubt, and other valve components are intact and undamaged.

1. Before installing the gasket, apply a layer of graphite powder or lubricant mixed with engine oil (or water) to the sealing surface, gasket, thread, and rotating parts of the bolt and nut. The gasket and graphite should be kept clean.

2. The gasket should be installed on the sealing surface in a moderate and correct manner, without deviation, and should not extend into the valve chamber or rest on the shoulder.

3. Only one gasket is allowed to be installed, and it is not allowed to install two or more gaskets between the sealing surfaces to eliminate insufficient clearance between the two sealing surfaces.

4. The sealing of elliptical gaskets should ensure that the inner and outer rings of the gasket come into contact, and the two ends of the gasket should not come into contact with the bottom of the groove.

5. The installation of the O-ring should not only meet the design requirements for the ring and groove, but also have an appropriate amount of compression. On the premise of ensuring sealing, the smaller the compression deformation rate, the better, which can extend the service life of the O-ring.

6. Before installing the gasket, the valve should be in the open position to avoid affecting installation and damaging the valve components. When covering, it should be aligned with the position and should not be pushed or pulled into contact with the gasket to avoid displacement and scratches on the gasket.

7. The installation of gaskets for bolted or threaded connections should ensure that the gaskets are in a horizontal position (threaded gaskets with wrench positions should not be used with pipe wrenches).

8. Before tightening the gasket, it is necessary to have a clear understanding of the pressure, temperature, properties of the medium, and material characteristics of the gasket to determine the pre tightening force. The preload should be minimized as much as possible without leakage during pressure testing.

9. After tightening the gasket, it is necessary to ensure that there is a pre tightening gap between the connecting parts in case of gasket leakage.

10. When working at high temperatures, bolts will experience high-temperature creep, stress relaxation, and increased deformation, leading to leakage at the gasket and requiring hot tightening. On the contrary, under low temperature conditions, bolts will shrink and require cold loosening.

11. When liquid sealing gaskets are used for sealing surfaces, their sealing surfaces should be cleaned or surface treated. The flat sealing surface should be ground to match, and the adhesive should be evenly applied. Air should be eliminated as much as possible, and the adhesive layer is generally 0.1-0.2mm.

12. When using polytetrafluoroethylene film raw tape for thread sealing, the starting point of the film should be forcefully pulled thin and adhered to the thread surface, and then the excess tape at the starting point should be removed to make the film adhered to the thread form a wedge.

The installation of sealing gaskets is not complicated, but there are many details that need to be noted. The correct installation is related to the sealing and operation of the equipment, so installation operators should keep the above items in mind and carefully inspect them during installation work.