Vacuum valve introduction

Vacuum valve: refers to the work pressure is lower than the standard atmospheric pressure valve. Vacuum valve several common forms of connection 1, flange connection This is the valve used in the most forms of connection. According to the shape of the junction can be divided into the following categories: 1) smooth: for the valve is not high pressure. Processing more convenient 2) Bump: high pressure, can be used in the hard washer 3) Mortise groove: available plastic deformation larger washers, used in a more extensive corrosive media, the sealing effect is better. 4) trapezoidal groove: with oval ring for gaskets, used for working pressure ≥ 64 kg / cm2 valve, or high temperature valve. 5) Lens type: Gasket is a lens shape, made of metal. For working pressure ≥ 100 kg / cm high pressure valve, or high temperature valve. 6) O-ring: This is a newer form of flange connection, which is developed with the advent of various rubber o-rings. It is more reliable in sealing effect than a plain washer. 2, threaded connection This is a simple method of connection, commonly used in small valves. There are two cases: 1) direct seal: the internal and external threads directly from the sealing effect. In order to ensure that the joints do not leak, often with lead oil, linen and PTFE raw material filled with tape; Teflon tape, widely used on a daily basis; this material is very good corrosion resistance, sealing effect pole Good, easy to use and store, when removed, it can be completely removed because it is a layer of non-sticky film, superior than lead oil, linen is much better. 2) Indirect seal: Thread tightening force, passed to the gasket between the two planes, so that the gasket sealing effect.