What is the use of metal wrap mats?
The metal wound mat skillfully utilizes the heat resistance, resilience and strength of the metal and the softness of the non-metallic material, so the sealing performance is good, and the performance of the stainless steel strip wound flexible graphite mat is optimal. The pre-tightening pressure is smaller than the asbestos winding mat, and there is no disadvantage of leakage of asbestos fiber capillary pores.
Teflon has good low-temperature resistance, and its yield strength at low temperatures is much higher than that at normal temperature. Therefore, the Teflon winding mat can be used for low temperature media such as liquid hydrocarbons. At the same time, the thermal conductivity is improved by the addition of the metal strip, the temperature of the PTFE winding mat can reach 250 ° C, and can be used in an acidic medium to be 9 MPa, 200 ° C.
The winding pad is suitable for heat exchangers with large pressure and temperature fluctuations, and the reactor, piping, valves, and pump inlet and outlet flanges are suitable. For medium and above pressures, if the temperature exceeds 300 °C, the inner ring, outer ring or inner and outer rings should be considered. If a concave-convex flange is used, the winding mat with the inner ring is better.
A good sealing effect can also be obtained by attaching a flexible graphite sheet to both sides of the flexible graphite winding mat. A large-scale chemical fertilizer plant waste heat boiler is a key equipment for high temperature and high pressure. It uses a flexible graphite winding mat with an outer ring. It does not leak at full load and leaks when the load is reduced. A flexible graphite plate with a thickness of 0.5 mm was added to both sides of the gasket, and it was cut into an arc shape, and the joint portion was overlapped by a slanting opening, and the use condition was good.