Gasket selection principle is that, for less demanding situations, can be empirically selected, and then replaced when the sub-city. But for those who seek Yange occasions, such as explosive, toxic and flammable gas Yi Ji Qiang corrosive liquid equipment, Fan Ying He can transport Guandaojitong Deng, should Genju work pressure, working temperature, Mifengjiezhi the corrosive combination of sealing Mian Ji Selection form. In general, low pressure at room temperature, the use of soft honey non-metallic gasket; in pressure at high temperatures, use combinations of metal and nonmetal or metal gasket seals; in temperature and pressure fluctuations are larger, use a good flexibility or self-tight seals; at low temperature, corrosive media or vacuum conditions, performance should be considered a special gasket. It should be clear is that the situation on the flange gasket Choice.
The form of flange. Different flange form, requires the use of gaskets are also different. Flange generally smooth surface for low pressure, with a thin soft gasket; at high pressure, if the flange of sufficient strength, smooth surface can also use the flange, but it should be soft with a thick pad, or use in-band to strengthen ring or enhance wound gasket ring. In such cases, the metal gasket does not apply, because then the pressing force required is too large, resulting in greater deformation of bolts, so difficult to seal flange. If you use metal gaskets, smooth surface should be reduced, to reduce the contact area with the pads. Thus, under the same bolt tension, reduce narrow smooth surface after the compressive stress will increase.
Flange surface roughness. Flange sealing surface roughness effects on the great influence, especially when the use of non-soft gasket, the sealing surface roughness is caused by a large degree the value of one of the main leak. For example, turning the knife flange pattern is the spiral, using the metal gasket, if the roughness of the large pads can not blo |
