The valve is the control part in the fluid conveying system, has the cut-off, the adjustment, diversion, prevent countercurrent, voltage, shunt or overflow relief functions, for fluid control system valves, from the simplest cut-off valve to the very complex automatic control system used in a variety of valves, the variety and specifications are quite numerous, valves can be used to control air, water, steam, a variety of corrosive media, mud, oil, liquid metal and radioactive media, such as the flow of various types of fluids.
Valve and pipe connection mode is an important parameter, according to this classification are:
1, threaded connection: valve body with internal thread or external thread, and pipe thread connection.
2, flange connection: valve body with flange, and pipe flange connection.
3, welding connection: Valve body with welded groove, and pipe welding connection.
4, clamp Connection: valve body with a clip, and pipe clamp connection.
5, Card sleeve connection: With the pipeline with a card sleeve connection.
6, on the clamp connection: The bolt directly to the valve and two pipe through the joint form of the clamp.