Control valve and upstream and downstream connection cut off the valve, the bypass valve

Control valves upstream and downstream shut off valve and bypass valve and control valve should be installed at the same time. Upstream and downstream cut the length of the tube between the valve and the control valve to the pipe resistance and the impact on the state of the fluid flow should be considered. Straight pipe length, is conducive to the stability of the fluid through the shut-off valve allows fluid flow smoothly, reduce turbulent flow impact, noise reduction; short length of straight pipe, flow through the shut-off valve has not been stable on the control valve, the noise enhancement , the short length of the pipe section help to reduce pipe resistance and improve the voltage drop across the control valve, so that the distortion of the flow characteristics is reduced, is conducive to the stable operation of the control system. Therefore, should be weighed and considered. Typically, the upstream side should be 10D to 20D of straight pipe upstream and downstream side of the 3D to 7 days of straight pipe. D is the nominal pipe diameter, where necessary, set the rectifier unit.
Choice of connectivity solutions. Control valve and upstream and downstream shut-off valve is connected to a variety of ways, Figure 6-10 several common connection. Figure, the structure of the program A compact layout, small footprint, easy to maintain and operate, easy venting or draining of the system. Often, however, it is not able to meet a sufficient length of straight pipe, causing noise enhancement. Option B structure a larger area, the control valve position can be installed in the lower or upper, easy to adapt to operational requirements, but the length of straight pipe is not easy to guarantee. Option C structure is suitable for the angular control valve can reduce the number of elbows, smaller footprint. The end of the flow into the side, longer upstream straight pipe length. Option D Option B is similar to a larger area. The structure of the program E applies to angular valve, compared with Option C, to shorten the length of straight pipe upstream side, is not conducive to the stability of the fluid. The structure of the program F is the most common connection structure. It covers an area smaller pipeline resistance, but less space to operate and maintain.air cylinder manufacturers
Relief valve, vent valve, drain valve connection, in order to facilitate the control valve disassembly before demolition pressure bleed valve before and after, the relief valve should be installed in the control valve on the shut-off valve downstream of between.
Vent valve, drain valve is used to discharge fluid entrained in the non-condensable gas and condensate. Installation, was charged with fluid, gas or
Steam, in order to facilitate the condensate drain, the drain valve should be installed at the lowest point in the control valve. Charged fluid is a liquid, in order to facilitate the non-condensable gas vent, the vent valve should be installed at the highest point of the control valve.
3 bypass valve. Control valve maintenance of the demolition, the bypass valve to operate the production process. When charged with the amount of traffic.pilot valves