Time:2014-12-23 From: Author:
The valve is in the fluid system for controlling the direction of the fluid, the pressure means, the flow rate is within the pipe and the media device (liquid, gas, powder) and to stop the flow or the flow of the control device.
The valve is in the pipeline fluid delivery system control unit, which is used to change the channel section and flow direction of media, with diversion, closing the throttle, check, diversion or overflow relief functions. For fluid control valves, valves shut-off valve from the simplest to the most complex automatic control system used in its many varieties and specifications, the valve nominal diameter from large to tiny instrument valve diameter up to 10m industrial piping valves. EHV can be used to control the water, steam, oil, gas, mud, a variety of corrosive media, liquid metals and radioactive fluids and other types of fluid flow, the valve working pressure from 0.0013MPa to 1000MPa, the working temperature from ultra-low to high temperatures of 1430 ℃ of -270 ℃.
Control valves can drive a variety of ways, such as manual, electric, hydraulic, pneumatic, turbine, electromagnetic move, electromagnetic hydraulic, electro-hydraulic, pneumatic and hydraulic, spur gears, bevel gear drive, etc; in pressure, temperature or under the influence of other forms of sensor signals, according to the requirements prescribed action, or do not rely on a simple sensor signal to open or close the valve being driven or automatic mechanism to make opening and closing pieces for lifting, sliding, swing or spin rotation movement, thereby changing the size of the flow passage area in order to achieve its control function.