What is non-negative pressure water supply?

Non-negative pressure water supply refers to the secondary pressurized water supply based on the residual pressure of municipal pipe network to ensure that the pressure of municipal pipe network is not lower than the set protection pressure. Non-negative pressure water supply, also known as non-negative pressure frequency conversion water supply equipment, can be directly connected with the water supply network, and has many advantages such as full sealing, no pollution, small floor space, quick installation, reliable operation and convenient maintenance. Non-negative pressure frequency conversion water supply equipment is suitable for daily water supply facilities such as high-rise buildings, residential quarters, enterprises and institutions, various waterworks, water supply pressurized pumping stations, etc.

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Non-negative pressure water supply equipment realizes that the equipment does not generate negative pressure on the municipal pipe network through intelligent control technology and voltage stabilization compensation technology, and ensures uninterrupted water supply to the user pipe network. The flow controller used in this equipment can automatically adjust the water input into the equipment from the municipal pipe network on the basis of maintaining the minimum use pressure, so as to ensure that the municipal pipe network does not generate negative pressure. During the peak water consumption period, the energy storage device releases pre-filled nitrogen with a certain pressure to ensure that the water in the high-pressure chamber of the pressure-stabilizing compensation tank is compensated to the constant-pressure chamber with a certain pressure, which can supplement the shortage of water input by the municipal pipe network in a certain period of time.

Non-negative pressure water supply equipment stores energy in the pressure stabilizing compensation tank through the bidirectional compensator in the period of low water consumption, which plays the role of pressure stabilizing compensation for the user pipeline. At night and when the water supply is low, water can be supplied through a small expansion tank to avoid frequent start-up of the water pump. Make full use of the pressure of municipal pipe network, and the energy saving effect is remarkable.

If the pump is directly connected to the municipal pipe network, there is no need to build a reservoir, but directly connected to the municipal pipe network. However, China's "Regulations on Urban Water Supply" stipulates that in order to prevent the impact on the surrounding residents' water use, it is not allowed to directly install domestic and production pumps on the municipal pipe network. In order to solve the problem that water supply equipment can be connected in series to the municipal water supply network without negative pressure, and the water consumption of other users will not be affected, it is necessary to add a non-negative pressure flow controller, a cavity-type voltage stabilizing compensation tank, a bidirectional compensator, etc. Between the pump inlet and the municipal pipe network. The non-negative pressure flow controller can monitor the pressure of the municipal pipe network at all times, and make full use of the original pressure of the municipal pipe network while ensuring that the municipal pipe network does not generate negative pressure.