Negative pressure water intake tank, commonly known as vacuum water intake tank, is used for non suction water supply pumps (places where the water source is lower than the pump inlet). It is recommended to use self irrigation for the fire protection system. If self irrigation cannot be achieved unconditionally, the fire protection regulations stipulate that there must be a reliable water intake device, namely a negative pressure water intake tank, used to draw natural water such as groundwater, rivers, lakes, and water intakes. The additional tap water in the tank is generally supplied through a DN25 pipe, which only needs to be filled once and used for life. The principle is that when the main fire pump starts working, the water level in the tank drops, and a true pressure (negative pressure) is formed at the top of the tank. When the water level in the tank drops to 60% of the tank, a certain vacuum is formed at the top of the tank, and the natural water source is continuously sucked out.
The negative pressure water intake tank is selected based on the fire flow rate, the diameter and length of the inlet pipe, and the height and diameter of the water intake riser.

Serial Number

model

diameter

height

Import

Export

volume

1

Negative pressure water intake tank

φ600

1750

DN50

DN50

0.41 m³

2

Negative pressure water intake tank

φ800

2050

DN100

DN100

0.85 m³

3

Negative pressure water intake tank

φ1000

2050

DN150

DN150

1.37 m³

4

Negative pressure water intake tank

φ1200

2250

DN150

DN150

2.1 m³

5

Negative pressure water intake tank

φ1400

2350

DN200

DN200

3.0 m³

6

Negative pressure water intake tank

φ1800

2550

DN250

DN250

5.6 m³

7

Negative pressure water intake tank

φ2000

2780

DN300

DN300

7.6 m³

The central air conditioning system room uses water collectors, water dividers, and air conditioning unit outlets to install water dividers. One or two sets of water pipes are used to enter the water, and then the water is divided into various water pipelines through the interface of the water dividers. After recycling, it is collected in the water collector, which is called a water collector.
The specifications are determined by the user unit based on the air conditioning circulating water flow rate and the specifications of the branch water pipe network. The collector and distributor are generally considered to be used for hot water between 50-70 ℃. Pressure gauges and thermometers are generally installed at both ends of the collector and distributor, and their diameter, length, and interface specifications are designed by the design institute. The inlet valve of the collector and distributor is usually a butterfly valve. As butterfly valves are special flanges, special instructions are required when ordering.
General specifications: * 250, * 300, * 400, * 500, * 600, * 800, * 1000, * 1200, * 1400, depending on the length and interface design. The installation of the collector and distributor is simple and easy, and the bracket is already installed and connected at the factory, without the need for pouring support piers or clamp connections.