Valve connection mode and technical requirements
Classification:
Release Time：2017-08-25
Valve connection is divided into: flange connection, clamp connection, welding connection, threaded connection and so on.
Between the entire valve and pipeline or equipment is how to connect, this problem can not be ignored, because the valve run, run, drip, leak phenomenon, the vast majority of occurred here.
1. Flange connection
This is the most used form of connection in the valve. According to the shape of the joint surface can be divided into the following:
1) Smooth type: used for low pressure valves, processing is more convenient.
2) Concave-convex type: high working pressure, medium-hard washers can be used.
3) tongue and groove type: the gasket with large plastic deformation can be used widely in corrosive medium, and the sealing effect is better.
4) Trapezoidal groove type: use oval metal ring as gasket, used for working pressure ≥64kg/square centimeter valve or high temperature valve.
5) lens type: gasket is a lens shape, made of metal. For working pressure ≥100kg/Square centimeter high pressure valve or high temperature valve.
6）ORing type: This is a newer form of flange connection, it is with various rubberOThe emergence of the ring, and developed, it is more reliable than the general flat washer in the sealing effect.
2. Interclamp connection
3. Butt welding connection
4. Threaded connection
This is a simple connection method, often used in small valves. Can be divided into two cases:
1) direct sealing: internal and external threads directly from the sealing effect. In order to ensure that the joint does not leak, it is often filled with lead oil, linen and PTFE raw material tape; among them, PTFE raw material tape is widely used; this material has good corrosion resistance and excellent sealing effect. It is easy to use and store. When disassembling, it can be removed completely, because it is a non-sticky film, which is much superior to lead oil and linen.
2) indirect sealing: the force of thread tightening is transmitted to the gasket between the two planes, so that the gasket plays a sealing role.
There are many forms of valve connection, valve users can choose according to the specific situation.
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