Box-type  non-negative pressure water supply equipment is divided into two categories, one is a common type of  non-negative pressure on the market equipment. In the municipal pipe network pressure is insufficient, completely and municipal pipe network disconnected, switching from open water tank to the water supply, which became the municipal pipe network pressure is  non-negative pressure state water supply in the municipal pipe network pressure is low Water pump for the water pump mode.

This low pressure in the municipal pipe network cut off the municipal water supply, the user all the water from the water tank to the water supply of non-negative pressure water supply equipment in this paper, called the switch-type  non-negative pressure water supply equipment box .

Switch-type box-type non-negative pressure water supply equipment in the municipal pipe network pressure is low,  non-negative pressure equipment can not use the municipal pipe network pressure, the client water supply pressure will be significantly reduced, resulting in some users due to lack of pressure, can not supply water.

The other is a pressurized box-type negative pressure water supply equipment. In the case of insufficient municipal water supply pressure, the equipment first ensures the pressure of the municipal pipe network, reducing the amount of water drawn from the municipal pipe network, the user water consumption and the municipal pipe network can supply the difference between the water tank to supplement, this is the so-called Differential compensation way to supply water, so you can make full use of municipal pipe network pressure and water supply, energy conservation, and reduce the tank volume.

Pressurized box-type  non-negative pressure water supply equipment in the tank water pressure is set by the tank pressurization device to pressurize the water supply, pressurization device is a combination of pump and valve, requiring pressurization device pressure and the municipal pipe network Of the pressure is quite, if the pressure of the pressurization device than the pressure of the municipal pipe network is much higher, will result in the municipal pipe network within the capacity of water supply capacity to reduce, can not make full use of municipal pipe network pressure and flow.

Because the pressure of the municipal pipe network will fluctuate, so the pressurization of the water supply pressure to be able to under the pressure of the municipal pipe network to adjust.

Tank  non-negative pressure water supply mainly by the water supply pump, steady flow device, backflow prevention device, control devices, negative pressure eliminator and other components, the working principle is in the pipe network pressure to allow direct suction from the pipe network, the use of Municipal pipe network pressure, energy conservation.

 Non-negative pressure water supply equipment, water absorption capacity is less than the pipe network, it will not cause the pipe network to reduce pressure, but the water peak period, the pump water absorption is greater than the pipe network water supply, the municipal pipe network pressure, resulting in steady flow When the pressure of the steady flow device drops below the atmospheric pressure, the negative pressure prevention device on the upper part of the steady flow compensator is opened and the water pump sucks water from the steady flow device. At this time, the steady flow device is connected with the atmosphere , The equivalent of a small container of water.

In this condition,  non-negative pressure water supply equipment and can not use the pipe network of water supply pressure, the steady flow of water is sucked, the unit will have to reduce the water supply or even water, such as pipe network pressure, the equipment capacity The use of pipe network pressure normal water supply.

It can be seen, tank  non-negative pressure water supply equipment in use, requiring the municipal pipe network in the peak water can meet the tank  non-negative pressure water supply equipment, so that the pressure regulator is higher than the atmospheric pressure, or is likely to stop Water affects the user's normal water use.