Pressure reducing valve

A pressure reducing valve is a valve that adjusts the incoming pressure to a certain required outlet pressure, and relies on the energy of the medium itself to automatically maintain a stable outlet pressure. From the perspective of fluid mechanics, a pressure reducing valve is a throttling element that can change local resistance. By changing the throttling area, the flow rate and kinetic energy of the fluid are changed, resulting in different pressure losses and achieving the purpose of pressure reduction. Then, relying on the adjustment of the control and adjustment system, the fluctuation of the pressure behind the valve is balanced with the spring force, so that the pressure behind the valve remains constant within a determined error range

Performance

1. Pressure regulation range: It refers to the adjustable range of the output pressure P2 of the pressure reducing valve, within which the specified accuracy is required.

. The range of pressure regulation is mainly related to the stiffness of the pressure regulating spring2. Pressure characteristics: It refers to the characteristic of output pressure fluctuations caused by input pressure fluctuations when the flow rate g is a constant value. The smaller the fluctuation of output pressure, the better the characteristics of the pressure reducing valve. The output pressure needs to be lower than the input pressure - a constant value in order to basically remain unchanged with changes in input pressure3. Flow characteristics: It refers to the consistency of the input pressure - timing, and the output pressure changing with the change of output flow rate g. When the flow rate g changes, the smaller the change in output pressure, the better. The lower the output pressure, the smaller the fluctuation with the change of output flow rateIt can reduce the high liquid pressure in the valve front pipeline to the level required in the valve back pipeline. The main transmission medium here is water. Pressure reducing valves are widely used in high-rise buildings, areas with high water pressure in urban water supply networks, mines, and other occasions to protect various water points in the water supply system from obtaining appropriate service water pressure and flow. Considering that the leakage rate and waste degree of water are almost proportional to the water pressure of the water supply system, the pressure reducing valve has practical effects on the main system operating conditions and potential water-saving effects. According to statistics, its water-saving effect is about 30%1. Close the gate valve before the pressure reducing valve and open the gate valve after the pressure reducing valve to create a downstream low-pressure environment2. Rotate the adjustment screw counterclockwise to the highest position (relatively suitable for outlet pressure), and then close the pressure reducing valve and gate valve3. Slowly open the gate valve in front of the pressure reducing valve until it is fully open4. Slowly rotate the adjustment screw clockwise to adjust the outlet pressure to the required pressure (based on the gauge pressure behind the valve); After adjustment, tighten the locking

nut and open the pressure reducing valve and gate valve

5. If the outlet pressure is higher than the set pressure during adjustment, it must be readjusted starting from good sales, that is, it can only be adjusted from low pressure to high pressure