Brief description of the pressure reducing valve

From the point of view of fluid mechanics, the pressure reducing valve of Wuhan changes the flow rate and the kinetic energy of the fluid by changing the throttle area, resulting in different pressure losses, thereby achieving the purpose of decompression. Then, relying on the adjustment of the control and regulation system, the fluctuation of the post-valve pressure is balanced with the spring force, so that the post-valve pressure remains constant within a certain error range.

The pressure reducing valve is a special device that automatically reduces the working pressure of the pipeline. It can reduce the pressure of the higher pressure medium to a given pressure after a given pressure reduction range. It reduces the higher liquid pressure in the pre-valve line to the level required for the post-valve line. The transmission medium here is mainly water. Pressure reducing valves are widely used in high-rise buildings, urban water supply networks, water pressure areas, mines and other occasions to ensure that the water supply system in the water supply system to obtain appropriate service water pressure and flow. Since the water leakage rate and the degree of waste are almost proportional to the water pressure of the water supply system, the pressure reducing valve has an improved system operating condition and potential water saving effect, and the water saving effect is about 30% according to statistics.

There are many types of pressure reducing valves, and conventionally, there are membrane type, inner spring piston type and the like. The basic principle of the pressure reducing valve is to reduce the water pressure by the local resistance of the flow passage in the valve to the water flow. The range of the water pressure drop is automatically adjusted by the pressure difference between the inlet and outlet of the membrane or the piston connected to the valve flap.

The general category of "reducing valve structure length". At present, most domestic pressure reducing valve manufacturers are designed and produced according to this standard. The maximum nominal diameter of the gas pressure reducing valve is DN500, and the maximum nominal diameter of the water pressure reducing valve is DN1000. According to the specifications of the pressure reducing valve produced by the manufacturer and the information obtained, the connection sizes of the manufacturers are not uniform. It is recommended that the General Machinery Research Institute revise the JB/T2203-1999 "Structure Length of the Pressure Reducing Valve". It is recommended that the design institute and users choose according to the standard, and the manufacturer of the pressure reducing valve is designed and manufactured according to the standard.