How to Select The Right Valve
How to select the valve according to the nature of the valve drive
1 power driven valve
Power driven vacuum valve is commonly used to drive the valve, usually referred to as the form of the drive device for the valve electric device, valve electric device features are as follows:
1) Open and close rapidly, can greatly shorten the time required to open and close the valve;
2) Can greatly reduce the labor intensity of operators, especially for high pressure, large diameter valve;
3) Suitable for mounting in a position that can not be manually operated or difficult to access, easy to implement remote control, and the installation height is not restricted;
4) Is conducive to the automation of the whole system;
5) Power supply is easier to obtain than gas source and liquid source, and the laying and maintenance of the wire is much simpler than that of compressed air and hydraulic pipeline.
2 pneumatic and hydraulic valves
Pneumatic vacuum valve and hydraulic pressure based on a certain air, water or oil as the power source, using the cylinder and the movement of the piston to drive the valve, the general pneumatic air pressure is less than 0.8MPa, the hydraulic pressure is 2.5MPa~25MPa. Sanitary diaphragm valve; rotary gas and liquid driving device is used to drive the ball valve, butterfly valve or cock valve.
The driving force of the hydraulic device is large, which is suitable for driving large diameter valves. If used to drive the plug valve, ball valve and sanitary butterfly valve, the piston must be converted to the reciprocating movement of the rotary surface. In addition to the cylinder or cylinder to drive the piston, there is no use of pneumatic film drive, because of its travel and driving force is small, it is mainly used for regulating valve.
3 manual valve
Manual vacuum valve is the most basic way of driving the valve. The utility model comprises a hand wheel, a handle or a hand plate which are directly driven and driven by a transmission mechanism to realize two kinds. When the starting torque of the valve is larger, the utility model can be driven by a gear or a worm gear to achieve the purpose of omission. Gear reduction ratio is small, suitable for gate valves and globe valves, worm gear reducer is relatively large, suitable for cock flash, ball valve and butterfly valve.
