The German LOCKE imported non negative pressure water supply equipment in the municipal pipe network for water, make full use of the original pressure of the municipal pipe network, the formation of a continuous closed relay pressurization water supply mode, energy saving effect is good, no two pollution of water quality, is the development and extension of variable frequency constant pressure water supply equipment. Usually, what we call negative pressure water supply equipment generally refers to the non negative pressure variable frequency water supply equipment, also called frequency conversion and no negative pressure water supply equipment. It is a pressurized device directly connected to the water supply network. The traditional way of water supply is inseparable from the reservoir. The water in the reservoir is generally supplied by tap water pipes. Such a pressure water enters the pool and becomes zero, resulting in a lot of energy wasted. No negative pressure water supply equipment is an ideal energy-saving water supply equipment, it is a kind of can be directly connected with the tap water pipe, two water supply equipment has no side effect on tap water pipe network not, based directly on the pressure of the municipal pipe network pressure superposed water supply, energy saving, and also has many advantages of fully closed, no pollution covers an area of small quantity, quick installation, reliable operation and convenient maintenance etc..

 

 

No negative pressure water supply is mainly composed of no negative pressure steady flow tank, pressure tank (diaphragm or airbag expansion tank), no negative pressure control cabinet, water pump, motor, filter, backflow preventer, sensor, electric contact pressure gauge, pipeline assembly, base and so on.

 

 

1, the original pressure system of the user can save energy and reduce consumption.

2. All kinds of medium water, sewage and wastewater treatment plants;

3, all kinds of waterworks, water supply pressure pump station;

4, oil pipelines, oil depots, oil pump station, oil etc.;Constant pressure oil system

5, no negative pressure water supply equipment is also suitable for all kinds of industrial and mining enterprises to produce water, such as circulating cooling water, industrial boiler water supply system and other constant pressure production water.

6, high buildings, residential communities, enterprises and institutions and other life, fire water supply system, HVAC, central air conditioning cycle and quality.

 

 

No negative pressure water supply equipment adopts microcomputer controlled variable frequency speed regulation to achieve constant pressure water supply. The negative pressure compensation system overcomes the bad influence on the pipe network, and has no negative pressure water supply equipment and equipment pressure value. The water of the water pipe network enters the steady flow tank. The air in the tank is discharged from the vacuum eliminator. After the water is filled, the vacuum eliminator automatically closes. When the pressure of tap water pipe network can meet the water requirement, the system by the bypass check valve to the water supply pipe network directly, when the pressure of tap water pipe network can not meet the requirements, the system pressure signal by a remote pressure gauge feedback to the inverter controller, pump operation, and according to the size of the water automatically adjust the speed of the constant pressure water supply. If the pump reaches the power frequency speed, another pump is started to run. Water pump water supply is, if the water pipe network water is greater than the flow of water pump, the system maintains the water supply. Water peak, if the content is less than the tap water pipe network water flow, steady flow tank water as supplement water to normal water supply, the air enters the steady flow tank by vacuum eliminator, vacuum tank is destroyed, to ensure that the tap water pipe network does not produce negative pressure, peak water over, return to normal state water supply system. When the tap water pipe network stops, the liquid level of the steady flow tank decreases. The signal of the liquid level detector is fed back to the frequency conversion controller, and the pump stops automatically to protect the pump unit. When a small flow of water at night and the pressure of the water pipe network can not meet the requirements, the pressure tank can store and release energy, avoiding the frequent start of the pump.

 

 

No negative pressure equipment is a future trend. In energy saving, pollution prevention and water safety, it is the most advanced market in the market. This device has significant advantages in saving energy, saving water, saving land and saving construction funds. It has become the first choice to replace the two water supply facilities such as pool and water tank. (1) no pollution, equipment for the whole sealing operation, no foreign body into the system; not in direct contact with air, negative pressure eliminator will the bacteria in the air is blocked, can not enter the system, the voltage stabilizing balancer using food grade stainless steel or steel plate made of green paint do not breed true, algae, non polluting products, meet the demand for drinking the water requirement is more and more high trend. (2) property management is convenient and simple. Direct pipe network pressurized water supply equipment is fully automatic operation of digital control, unattended, power outage and water stop automatically, and incoming water automatically starts, because there will be no pollution, so there is no need to troublesome cleaning. Don't waste energy (3), direct pressure superposed water supply equipment directly with the network stack series, based on the original network pressure on required pressure, compared with the pressure required for how many, how much worse, can make full use of network residual pressure, will not cause energy waste, in line with the national energy saving request. (4) the cost is low, because there is no need to build reservoirs or water tanks, so a lot of investment in civil engineering has been saved. And because the residual pressure of tap water pipe network is not needed from zero pressure, the selection of pressure pump is smaller and equipment investment is reduced. Because the shape of the pressurized pump is small, and the multi pump system is adopted, when a pump is enough to meet the needs of water at low water peak period, the other pumps will be started at the peak of water consumption. Therefore, the energy consumption is very low and the operation cost is reduced during the operation of the equipment. (5) simple installation, direct pipe network superimposed water supply equipment for the complete supply of users, the site only need to join the import and export pipe, short construction period, simple installation.

 

 

 At the same time, no negative pressure water supply has the following shortcomings: first, its water supply reliability is not high. It lacks the reservoir, the municipal water supply is malfunctioning, the whole equipment is paralyzed, and the water will be in a state of water. Secondly, the technology is not mature, and the technology needs to be further improved. Third, as a result of pumping water directly from the municipal pipe network, although the negative pressure can be solved, it must be approved by the competent department. Finally, the key point is that there is no standard and feasible in the whole industry. Our country once stipulated in the urban water supply Ordinance: "it is forbidden to pump water directly on the public water supply pipeline of the urban pipeline network" because the negative pressure generated during pumping will interfere with the hydraulic condition, affect the surrounding water consumption, and even cause the damage of the pipe network. So in the project design, first build a pool or water tank, then pressurized pump pressure to the user's water supply network. In 2004, some of the above-mentioned articles were banned in China, and the detailed rules were introduced. This kind of product has been used in Beijing, Shanghai, Tianjin, Guangzhou, Shandong and other areas, especially in the field of living water supply. But without negative pressure water supply technology has its own limitations, it can not be used normally under the following conditions: (1) the area of frequent water stop in urban water supply network; The urban water supply network can make use of the low water head area. (3) the area of excessive fluctuation of water supply in urban water supply network; (4) the use of pipe network (no negative pressure) water supply equipment, the surrounding existing (or planning) users will have a serious impact on the area of water; The water supply guarantee rate is high, and the users who are not allowed to stop water are not allowed. Where the return may cause pollution in Weihai industry of municipal pipe network, such as hospitals, pharmaceutical, chemical and other factors, which is restricted to non negative pressure water supply technology "blossom everywhere".