The valve utilizes the pressure difference generated by the cross-sectional area of ​​the piston inside the valve body to change the pressure behind the valve to achieve the purpose of decompression, accurate proportion, stable operation, long service life, high applicable temperature, and can reduce the dynamic pressure and reduce Pressure, horizontal and vertical installation are available.
Introduction
The proportional pressure reducing valve has beautiful appearance, reliable quality, accurate proportion and stable operation, which not only reduces the dynamic pressure but also reduces the static pressure. The valve uses the pressure difference generated by different load-bearing areas at both ends of the piston inside the valve body to change the pressure behind the valve to achieve the purpose of decompression. The proportional pressure reducing valve has a decompression ratio of 2:1, 3:1, 4:1, 3:2, 5:2, etc., and a special proportional pressure reducing valve can be designed according to requirements.
working principle
When there is no water on the pipe network after the valve, the valve is closed, and the pressure ratio before and after the valve is constant; when the pipe network is activated by the fire hydrant or the nozzle, the pressure before the valve is greater than the pressure behind the valve, pushing the piston back to the proportional pressure reducing valve When the valve is opened, the pressure of the pipe network decreases with the increase of the flow rate (according to the flow-pressure characteristic curve) until the equilibrium position is reached, and the piston stops moving. When the rear pipe network stops using water, the proportional pressure reducing valve piston loses equilibrium and moves forward due to the pressure increase at the rear end of the piston, and the proportional pressure reducing valve is closed. Generally, the proportional pressure reducing valve is selected so that the design flow rate is on the straight line segment of the flow-pressure characteristic curve, so that the post-valve pressure is still proportional to the pre-valve pressure.
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