QZG Type Automatic Water Supply Equipment

I. Overview
The QZG type automatic water supply equipment is a unit-type diaphragm pressure water supply device composed of a diaphragm-type pressure tank, water pump, and electrical control cabinet. Its features include: compact structure, flexible layout, easy installation, low cost, and convenient maintenance.
For high-rise buildings:
It can replace elevated water tanks, save space occupied by technical floors, facilitate seismic fortification of buildings, reduce building investment, and address top-pressure firefighting pressure issues.
For industrial, mining, and village water supply:
It can replace water towers, adapt to development trends, gradually expand water supply scale and increase water supply pressure, and reduce early construction scale and capital investment.
Diaphragm pressure water supply device. One-time air charging for long-term use, water quality remains uncontaminated. The diaphragm pressure water supply device enables automatic operation, simple management, and is safe and reliable.

II. Matching Water Pump
This device is equipped with a DL vertical multi-stage centrifugal pump. The pump's water outlet can be rotated 90°, 180°, or 270° according to usage requirements. The balance drum and balance sleeve are reinforced. The water outlet section, middle section, water inlet section, guide vane, and impeller are made of high-quality cast iron, and the shaft is made of high-quality steel, ensuring a long service life. Its features include: stable operation, durability, low noise, and small footprint.

III. Working Principle
The diaphragm-type pressure water supply device is divided into two chambers by the diaphragm: the water storage chamber and the air storage chamber. Under constant temperature conditions, when the water pressure in the water chamber increases, the air in the air chamber is compressed, the diaphragm expands, and water enters the water chamber; when the water pressure decreases, the air in the air chamber expands, the diaphragm contracts, and water exits the water chamber. The volume change of gas in the container formed under the higher and lower water supply pressures of the pump is the working regulation capacity of the device.
When the system's water consumption is less than the pump's water supply capacity, the system water pressure gradually increases. When the system pressure reaches the set maximum working pressure, the pressure relay activates, stopping the pump. When the pump is not operating, the stored water in the tank supplies the system. As the stored water in the tank decreases, the system pressure gradually drops. When the system pressure falls to the set minimum working pressure, the pressure relay activates, starting the pump. The diaphragm pressure water supply device operates in this cyclical manner to achieve automatic continuous water supply within the set working pressure range.