Valve is an automated pipeline to reduce the work pressure of specialized equipment, it can be a high pressure valve before the pipeline after the pipeline valve reduced to the required level. Valve is widely used in high-rise building, city water supply high pressure in the network area, mines, and other occasions, in order to ensure water supply system, each point of access to appropriate services, water pressure and flow. In view of the rate of water leakage and waste water system is almost the same proportion to the size of the water pressure, so reducing valve has to improve the system operating conditions and potential water-saving effect, according to statistics about 30% of its water-saving effect.
The construction of many types of valve, in the past often have membrane-type, inner spring piston and so on. The basic principle is that the role of valve by valve flow channel to reduce local resistance to the flow of water pressure, water pressure drop range from connection valve piston valve on both sides of import and export of films, or automatically adjust the water pressure difference. Emerged in recent years, some new pressure reducing valve, reducing valve, if given more than. Set theory is the use of more than decompression valve piston floating in water pressure than the control, import and export and import and export side than the end of decompression area ratio is inversely proportional to the piston. Such valves working smoothly without vibration; valve body without spring, so no spring corrosion, metal fatigue failure of taking into account; sealing good performance does not leak, thus both reducing the dynamic pressure (water flow) also reduced static pressure (flow rate 12:00); particularly in the decompression at the same time does not affect the water flow.
DN50 ~ DN100 valves usually have a variety of specifications, valves before and after the work pressure were <1MPa and 0.1 ~ 0.5MPa, voltage range of error of ± 5% ~ 10%.
It should be noted, though much water flow through the valve head loss, but because of reduced flow of water wastage and a reasonable distribution system, improving the system layout and operating conditions, so the whole is still energy-efficient.
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