Description of several common connection methods of vacuum ball valve

Several common connection methods for vacuum ball valves

1, flange connection

This is the most used connection method in the valve. According to the shape of the joint surface, it can be divided into the following types:

1) Lubrication type: for valves with low pressure. Processing is convenient;

2) Concave-convex type: high working pressure, medium-hard washers can be used;

3) grooving type: It can be used with gaskets with large plastic deformation, which is widely used in corrosive media and has good sealing effect;

4) Trapezoidal trough type: use an oval metal ring as a gasket for valves with a working pressure of ≥64 kg/cm 2 or high temperature valves;

5) Lens type: The washer is a lens shape and is made of metal. High pressure valve for working pressure ≥100 kg/cm 2 or high temperature valve

6) O-ring type: This is a newer way of flange connection. It is followed by the appearance of various rubber O-rings. It has been developed to be more reliable than ordinary flat washers.

2, thread connection

This is a simple connection that is often used for small valves. There are two conditions:

1) Direct sealing: The internal and external threads directly seal the effect. In order to ensure that the junction is not leaking, it is often filled with lead oil, wire hemp and Teflon raw material tape; during this period, the Teflon raw material tape is widely used; this kind of data has good corrosion resistance and excellent sealing effect. It is easy to use and save. When it is disassembled, it can be completely removed. Because it is a non-stick film, it is much better than lead oil and wire.

2) Direct sealing: the force of the screw tightening is transmitted to the gasket between the two planes, so that the gasket has a sealing effect.