Working principle of pressure reducing valve

    (1) From the point of view of fluid mechanics, pressure reducing valve is a local resistance can change the throttling element, that is, by changing the throttling area, so that the flow rate and the kinetic energy of the fluid to change, resulting in different pressure loss, so as to achieve the purpose of pressure reduction valve. It relies on the control and regulation system to make 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) Pressure reducing valve can reduce the higher liquid pressure in the pipeline before the valve to the required level in the pipeline after the valve, and its transmission medium is mainly water. Pressure reducing valves are widely used in high-rise buildings, urban water supply network water pressure is too high in the region, mines and other occasions, in order to ensure that the water supply system in the water points to obtain the appropriate service water pressure and flow. In view of the water leakage rate and the degree of waste is almost proportional to the size of the water supply system water pressure, so the pressure reducing valve has to improve the operating conditions of the system and the potential role of water saving, according to statistics, its water-saving effect is about 30%.

    (3) the working principle of the pressure reducing valve is through the adjustment, the inlet pressure will be reduced to a certain need for the outlet pressure, and rely on the medium's own energy, so that the outlet pressure is automatically stabilized.

    Pressure reducing valve installation precautions are

    (1) In order to operate and maintain the convenience of the pressure reducing valve generally need to be installed in the horizontal pipeline. Pressure reducing valve installation, must be strictly in accordance with the direction of the arrow on the valve body for installation, need to maintain the same direction of flow with the fluid. 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 not less than 4m away from the valve outlet. Pressure reducing valve in the pipeline to play a certain role in the check, in order to prevent the harm of water hammer, can also be installed in a small expansion tank, to prevent damage to the pipeline and the valve, the filter must be installed in front of the inlet pipe of the pressure reducing valve, while the expansion tank must be installed after the outlet pipe of the pressure reducing valve.

    (3) If it is necessary to install a pressure reducing valve in a hot water system, you must install a check valve between the pressure reducing valve and the expansion tank. This allows the expansion tank to absorb the increased volume of water due to thermal expansion, and prevents hot water backflow or pressure fluctuations from affecting the pressure reducing valve, ensuring that the pressure reducing valve works properly for a long period of time.