Water supply equipment without negative pressure
Classification:
Constant pressure water supply unit
Details
Overview
Water supply equipment without negative pressure is a pressurized water supply unit that directly connects to the municipal water supply network. It boosts the pressure based on the remaining pressure in the municipal network to ensure that the pressure in the municipal network is no less than the set protection pressure. This is a secondary pressurization water supply equipment.
The complete set of equipment consists of a surge tank, a vacuum breaker, a variable frequency speed water pump unit, a pressure sensor, a variable frequency control cabinet, a backflow preventer, a disinfection device (optional), and a low-flow pressure maintaining tank (optional). The inlet pipe from the municipal water network is directly connected to the inlet of the surge tank. The outlet of the surge tank is connected to the inlet pipe of the pressure pump unit after passing through the disinfection device. The outlet pipe of the pressure unit is connected to the user's water pipe, directly supplying water to the user's network.
The core of the water supply equipment without negative pressure is that it can prevent the generation of negative pressure during the operation of the secondary pressurized water supply system, eliminating the impact of the unit's operation on the municipal water network. It ensures safe, reliable, and stable water supply without affecting the water use of nearby users. Water supply equipment without negative pressure is also known as a pipeline pressure boosting water supply equipment. Currently, the main types on the market are tank-type and box-type water supply equipment without negative pressure.
Tank-type Water Supply Equipment without Negative Pressure
In tank-type water supply equipment without negative pressure, a pressure-sealed tank is installed before the water pump. A surge compensator (also known as a "vacuum eliminator") is added inside or outside the tank. The water pump draws water through the surge tank, pressurizes it, and then supplies it to the user. The regulating function of the surge compensator reduces the impact on the public water supply network. This method has no reserve water capacity, and in case of water supply interruption in the urban public water supply network, water interruption is likely to occur.
Box-type Water Supply Equipment without Negative Pressure
This method uses a non-pressure regulating water tank. Through an electronic control device, the water in the regulating water tank circulates at least twice a day (adjustable) to ensure the water quality remains unchanged. When the water quantity and pressure conditions of the municipal water network meet the requirements of water supply without negative pressure, water is directly drawn from the municipal water network; otherwise, water is drawn from the regulating water tank. This method has a certain amount of reserve water and can be used in areas with unstable water supply networks. However, due to the presence of a water tank and inspection manhole, regular cleaning and disinfection must be carried out according to regulations.
Working Principle
The tank-type water supply equipment without negative pressure is directly connected to the municipal water network and supplies water in series with the remaining pressure in the municipal water network.
(1) Variable Frequency Constant Pressure Water Supply:When the water supply from the municipal water network is greater than the user's water consumption, the tank-type water supply equipment without negative pressure supplies water at a variable frequency and constant pressure. At this time, a certain amount of pressurized water is stored in the surge tank.
(2) Eliminating Negative Pressure:When the increase in user water consumption causes the pressure at the connection point between the municipal water network and the surge tank to drop, and when the pressure drops below the relative pressure of 0, negative pressure is formed in the surge tank. The air intake valve of the vacuum breaker opens, and air enters the surge tank. At this time, the surge tank is equivalent to an open water tank with a free liquid surface, and the pressure is the same as the atmospheric pressure, and the negative pressure is eliminated. When the water level drops to the set value, the liquid level controller transmits a control signal to the control system in the variable frequency control cabinet, controlling the pressure unit to stop working, and the user's water supply is interrupted. When the user's water consumption decreases, the water level in the surge tank rises, and the gas is discharged from the exhaust valve of the vacuum breaker. After the pressure returns to normal, the pressure unit automatically restarts and resumes water supply.
(3) Water Stop and Machine Stop Function:When the municipal water network stops supplying water, the pressure unit automatically stops running under the control of the liquid level controller. After the municipal water network resumes water supply, it automatically starts and resumes normal water supply.
(4) Low-flow Sleep Function:When the user does not use water or the water consumption is very small, the equipment automatically enters the sleep state (stops) and maintains the water supply pressure. When the user resumes water use, the system automatically wakes up and resumes normal water supply.
(5) Power Failure Continues Water Supply:When the community experiences a power outage, the municipal water network continues to supply water to users in the lower areas, ensuring uninterrupted water supply during power outages. After the equipment restores power, it automatically starts and resumes normal water supply.
Selection and Dimensions of Water Supply Unit without Negative Pressure
|
Reference Number of Households |
Model |
Flow Rate m3/h |
Surge Tank Dimensions |
One Tank Three Pumps Dimensions |
|
20 |
WFY-10/ □ |
10 |
DN600X1300 |
1300*1500*1000 |
|
50 |
WFY-18/ □ |
18 |
DN600X1300 |
1300*1500*1000 |
|
100 |
WFY-24/ □ |
24 |
DN800X1500 |
1500*1850*1350 |
|
150 |
WFY-30/ □ |
30 |
DN800X1500 |
1500*1850*1350 |
|
200 |
WFY-34/ □ |
34 |
DN800X1500 |
1500*1850*1350 |
|
250 |
WFY-40/ □ |
40 |
DN800X1500 |
1500*1850*1350 |
|
300 |
WFY-46/ □ |
46 |
DN800X1500 |
1500*1850*1350 |
|
350 |
WFY-48/ □ |
48 |
DN800X1500 |
1500*1850*1350 |
|
400 |
WFY-53/ □ |
53 |
DN800X1500 |
1500*1850*1350 |
|
500 |
WFY-63/ □ |
63 |
DN800X1500 |
1500*1850*1350 |
|
600 |
WFY-72/ □ |
72 |
DN800X1500 |
1500*1850*1350 |
|
700 |
WFY-80/ □ |
80 |
DN800X1500 |
1500*1850*1350 |
|
800 |
WFY-90/ □ |
90 |
DN800X1500 |
1500*1850*1350 |
|
900 |
WFY-98/ □ |
98 |
DN800X1500 |
1500*1850*1350 |
|
1000 |
WFY-107/ □ |
107 |
DN1000X1800 |
1800*2150*1550 |
|
1250 |
WFY-133/ □ |
133 |
DN1000X1800 |
1800*2150*1550 |
|
1500 |
WFY-154/ □ |
154 |
DN1000X1800 |
1800*2150*1550 |
Note:1、□…indicates the pump head (meters)
2. The dimensions of one can with three pumps, excluding the electrical control cabinet.
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