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CAS :
nature : also known as valves and valve. Control of fluid flow in the pipe components. Its functions are : (1) hoist, or cut off communication pipe fluid flow; (2) regulatory role of the pipeline resistance to change and adjust fluid through the pipe flow; (3) reducing expenditure, allowing fluid through the valves after great pressure drop; (4) based on certain factors automatically open and close to control the flow of fluid to maintain pressure or other role. According to the action principle can be divided into : (a) he valve, screw plug, cut powerful family, diaphragm valves, gate valves, valve disc; (2) automatic valves (automatic valve), Check Valves, safety, etc. 11. According to the manipulation of power, can be divided into manual control, motor control, electromagnetic control, pressure control, hydraulic control. Under the pressure valve can be divided into vacuum valves, low pressure valve, the pressure valve, high pressure valves and valve EHV. Driven by energy, it can be divided into pneumatic, electric and hydraulic three categories; According to stem moves, the straight-type program and the corner; The pneumatic control valve films, films from the above leads to pressure signals, Film and stem the downward movement is said, on the contrary counterproductive said.
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