The working principle of pressure reducing valve

Pressure reducing valve is a kind of special device, reduce the working pressure pipeline automatically, it can be by high water pressure reducing valve before pipe to the valve pipe after the required level. Pressure reducing valve is widely used in high-rise buildings, the area of urban water supply pipe network pressure is too high, mines and other occasions, to ensure that each water point in water supply system water pressure and flow to have the appropriate services. In view of water leak rate and degree of waste almost as the water pressure is directly proportional to the size of feed water system, thus reducing valve have improve system operation condition and potential water-saving effect, according to statistics, the water-saving effect is about 30%.

The structure of the pressure reducing valve type many, common in the past have a spring in the diaphragm, piston, etc. Within the basic principle of the pressure reducing valve by valve port on the local resistance to reduce the water pressure, water pressure drop by connecting disc film or the scope of import and export pressure difference on both sides of the piston automatic adjustment. In recent years appeared some new type pressure reducing valve, such as constant ratio type pressure reducing valve, the construction principle as shown in figure 14.2 2. Constant ratio reduced pressure principle is to use the body of the floating piston hydraulic pressure ratio control, import and export side pressure ratio is inversely proportional to the import and export side piston area ratio. The pressure reducing valve work smoothly without vibration; The body without the spring, so no spring rust, metal fatigue failure were evident; Good sealing performance, leakage and therefore reduced pressure (water flow) and reduction of static pressure (flow to 0); Especially in relief at the same time does not affect the water flow.

 

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