The fan-shaped five-valve group consists of high- and low-pressure valves, a balancing valve and two calibration (drain) valve groups; the five-valve group is suitable for various imported instrument devices and installed with various differential pressure, flow, liquid level and other transmitters. When working, the two groups of calibration valves and the balancing valve are closed. If inspection is required, just cut off the high and low pressure valves, open the balancing valve and the two calibration valves, and then close the balancing valve to calibrate and balance the transmitter.
