How does the pressure reducing valve work?
How the valve works
(1) From the fluid mechanics point of view, the pressure reducing valve is a local resistance can change the throttle element, that is, by changing the throttle area, the flow rate and the kinetic energy of the fluid change, resulting in different pressure losses, so as to achieve the purpose of decompression of the valve. It depends on the adjustment of the control and adjustment system, so that the fluctuation of the pressure after the valve is balanced with the spring force, so that the pressure after the valve is kept constant within a certain error range.
(2) The pressure reducing valve can reduce the higher liquid pressure of the pipeline in front of the valve to the required level of the pipeline behind the valve, and the transmission medium is mainly 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 ensure that each water point in the water supply system obtains appropriate service water pressure and flow. In view of the water leakage rate and waste degree is almost proportional to the water pressure of the water supply system, so the pressure reducing valve has the effect of improving the operating conditions of the system and potential water saving, according to statistics, the water saving effect is about 30%.
(3) The working principle of the pressure reducing valve is to reduce the inlet pressure to a certain required outlet pressure by adjusting it, and rely on the energy of the medium itself to keep the outlet pressure automatically stable.
What are the precautions for installing the pressure reducing valve
(1) For the convenience of normal operation and maintenance, the pressure reducing valve generally needs to be installed upright on the horizontal pipe. When installing the reducing valve, install it in strict accordance with the arrow direction on the valve body and keep it consistent with the direction of fluid flow. If the water quality is not clean and contains some impurities, a filter must be installed at the upstream inlet of the pressure reducing valve to avoid affecting the normal operation of the pressure reducing valve.
(2) In order to prevent overpressure after the valve, a pressure reducing valve should be installed at not less than 4m from the valve outlet. The pressure reducing valve plays a certain check role in the pipeline, and in order to prevent the harm of water hammer, small expansion can also be installed
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