Rubber seal gasket selection

?Rubber seal gasket selection, working conditions for gasket less demanding situations, they can rely on their experience to select. As for the conditions for gasket demanding situations, the need according to the temperature, working pressure of work, combined with the sealing surface forms of media and demands to choose.

??At room temperature, low pressure, generally used homesick gasket. In the case of high temperature pressure, you should use a combination of metal and non-metal gasket or a metal gasket. When the temperature and pressure have greater volatility, the choice of good flexibility or self-tight seal; at low temperature, corrosive media or vacuum conditions, the gasket should be considered with special properties. It should be noted that the impact of the case on the flange gasket choice.

??Flanges in different forms, requires the use of pads are also different. Smooth face flange is generally used for low pressure, with soft thin rubber gasket; under high pressure, with a smooth surface of the flange may be, but it should be with a thick soft pad or reinforcement ring or band with reinforcement ring wound gasket.

??In this case, because this time the pressing force required is too large, resulting in large deformation bolt, the flange seal is not easy. If you use a metal gasket, smooth surface should be reduced so that the gasket contact area is reduced. Thus, in the case of the same bolt tension, the compressive stress narrow smooth surface after reduction will increase.

??Flange surface roughness on the sealing effect is large, especially when using a non-soft gasket sealing surface roughness value is the main cause of a large leak. For example, turning knife pattern flange surface is spiral, the use of metal gaskets, if the roughness is large, the gasket can not be blocked this spiral groove knife pattern formed, under pressure, the media will along this trench leaked.

??Soft gasket on the flange surface finish degree requirements low, and this is because it is easily deformed, machining tool can be blocked pattern, thereby preventing leakage. For soft gasket and flange surface is too smooth detriment, because the interfacial leak resistance becomes smaller. Therefore, various gaskets, the flange surface roughness required is not the same