Too many to count method selection of valve selection valve in accordance with the valve, if the nature of the words, how should choose?
First from the electric valve, electric valve is commonly used driving method of the valve, usually called the driving device forms of valve electric device, the following characteristics of valve electric device: 1> rapid opening and closing, can greatly shorten the time required to open and close the valve; 2> can greatly reduce the operator's labor strength, especially suitable for high pressure, large diameter valves; 3> is suitable for installation in position cannot be operated manually or inaccessible, easy to realize remote operation, and the installation height to unrestricted; 4> automation of the whole system; 5> power gain is easier than the gas and liquid source, the wire laying and maintenance than compressed air and hydraulic lines much simpler. However, the disadvantage is that the valve electric device structure is complex, damp places in the more difficult, for the explosive medium, the need to use explosion-proof measures. Electric valve actuators are driven by different types of valves, can be divided into Z type and Q type two categories. The output shaft of Z type of valve electric device can turn a lot of ring, suitable for driving gate valve, globe valve, diaphragm valve; Q type valve electric device can rotate the output shaft 90. , suitable for driving plug valve, ball valve and butterfly valve. Type of protection according to their common type, flameproof (expressed as B), heat-resistant (represented by R) and three in one type (i.e., outdoor, anti-corrosion, explosion-proof, expressed as S). Valve electric device by the transmission mechanism (reducer), composed of a motor, a stroke control mechanism, the torque limit agencies, manual and electric switching mechanism, opening indicator.
Second is the pneumatic and hydraulic valves, pneumatic valves and hydraulic pressure based on a certain air, water or oil as a power source, using the cylinder (or cylinder) and the movement to drive the piston valve, general pneumatic air pressure is less than 0.8MPa, the hydraulic or hydraulic pressure is 2.5MPa~25MPa. Or diaphragm valve; rotary type gas, liquid driving device for driving device used to drive the ball valve, butterfly valve or cock valve. Hydraulic device drivers, suitable for driving large diameter valves. As for driving plug valve, ball valve and butterfly valve, must convert the reciprocating motion of the piston plane rotary motion. In addition to pneumatic or hydraulic cylinder piston to drive, not a film driven by pneumatic, itinerary and driving force for its small, it is mainly used to adjust the valve.
The last is the manual valve, manual valve is the most basic drive way valve. It includes direct driving and driven by the transmission mechanism for two kinds of handwheel, handle or board. When the valve opening and torque is large, can be driven by a gear or worm gear transmission, in order to achieve the objective. Gear transmission division of spur gears and bevel gear transmission. Gear reduction ratio, suitable for gate and globe valves, worm reduction gear is relatively large, suitable for cock flash, ball and butterfly valves. So remind: Jingyi valve from the valve drive properties can be used valve according to these methods.
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