The valve type should normally indicate the valve type, drive type, connection type, structural characteristics, sealing surface material, valve body material and nominal pressure. The standardization of valve models provides convenience for the design, selection and sale of valves. With more and more types and materials of valves today, the valve design is becoming more and more complicated. Although China has a unified standard for valve model preparation, it is increasingly unable to adapt to the needs of the valve industry development. For new valves that cannot be numbered, manufacturers can build models to suit their needs.
The "valve model preparation method" standard applies to industrial pipeline gate valves, throttle valves, ball valves, butterfly valves, diaphragm valves, plunger valves, plug valves, check valves, safety valves, pressure reducing valves, steam traps, etc. It includes the type design of the valve and the naming of the valve.
Connection method
Flange connection
This is the most used form of connection in the valve. According to the shape of the joint surface, it can be divided into the following types:
1. Smooth type: used for valves with low pressure. More convenient processing
2, concave and convex type: high working pressure, can use medium hard washer
3. Gutter type: It can be used with gaskets with large plastic deformation. It is widely used in corrosive media and has good sealing effect.
4, trapezoidal trough type: use oval metal ring as a gasket, used for valves with working pressure ≥ 64 kg / cm 2 , or high temperature valves.
5, lens type: the gasket is a lens shape, made of metal. For high pressure valves with working pressure ≥100 kg/cm 2 or high temperature valves.
6, O-ring type: This is a newer form of flange connection, it is developed with the appearance of various rubber O-rings, it is in the form of a sealed connection.
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