Industrial Valves Functions：
1. Opening and closing function — cutting off or communicating the flow of fluid in the pipe;
2. Regulating function: regulating the flow and velocity in the pipe;
3. Throttling effect – make the fluid through the valve to produce a great pressure drop;
4. Other functions: A. automatic opening and closing; B. maintaining a certain pressure; C. steam blocking and drainage.
Industrial Valves Problems:
1. Flange and thread leakage at the connection with pipeline;
2. Leakage of packing culvert, leakage of waist cushion and valve rod not moving;
3. The valve core and the valve seat are not tightly closed to form internal leakage.
