All the above connection forms use external force to offset the medium pressure and realize sealing. The following describes the connection form of self tightening by using medium pressure. Its sealing ring is installed at the inner cone and forms a certain angle with the side opposite to the medium. The medium pressure is transmitted to the inner cone and then to the sealing ring. On the cone at a certain angle, two components are generated, one is parallel to the center line of the valve body and the other is pressed towards the inner wall of the valve body. The latter component is the self tightening force. The greater the medium pressure, the greater the self tightening force. Therefore, this connection form is suitable for high-pressure valves.
Compared with flange connection, it saves a lot of materials and manpower, but it also needs a certain preload, so that it can be used reliably when the pressure in the valve is not high. The valve made of self tightening sealing principle is generally a high-pressure valve.There are many forms of valve connection, for example, some small valves that do not need to be removed are welded with pipes; Some non-metallic valves adopt socket connection, etc. Valve users should be treated according to specific conditions.
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