Product Description

1. Overview of equipment
Variable frequency constant pressure water supply equipment is a new type of energy-saving water supply equipment. Variable frequency constant pressure water supply equipment is using today's most advanced microcomputer control technology, it is a electrical integration of high-tech and energy-saving water supply device which is combined with frequency converter and motor water pump. Variable frequency constant pressure water supply equipment uses the output water pressure which is from the water pump(or users water using flow) as the setting parameters, through the microcomputer automatic control inverter output frequency to adjust the speed of water pump motor, to realize the closed-loop adjustment of users pipe network pressure, at last to make the water supply system pressure to the given value: the water consumption increases, the frequency increase, the water pump speed accelerated; the water consumption decreases, the frequency is reduced, the pump speed will slow down. By this way can make sure the user's network has sufficient water pressure at any time (consistent with the user setting pressure) and water yield (changes along with the user's water consumption situation).
With the development of the secondary water supply pressurization technology, variable frequency constant pressure water supply equipment has solved these problems fundamentally. According to data from "water supply equipment promotion center",  Variable frequency constant pressure water supply equipment does not need to build towers, but has small investment and economic space occupation, automatic adjustment of water and its pressure, automatic operation and energy saving, automatic combining with tap water, there always has water even the electric blackout, without supervision for years after debugging. Saving *0% of investment than build towers, *0% of investment than build high level cistern, greatly save construction investment.
Variable frequency constant pressure water supply equipment is widely used in enterprises and public institutions, residential area and the rural production and living. Water supply for ******0 households. Daily water supply is *******0 m3, water supply height is **0 meters, about *0 layers buildings.

2. Equipment composition
Variable frequency constant pressure water supply equipment is mainly composed of water pump unit, pressure test buffer tank, pressure sensors, frequency conversion control cabinet etc., This equipment can always maintaining the gauge pressure (users pipe network pressure) is equal to the users setting parameters. Variable frequency constant pressure water supply equipment can be used for general life or production. Composition modes are:
A, frequency conversion water supply equipment connect with municipal pipeline, then supply water by constant pressure, when the municipal pipeline water pressure is enough, the water pump will stop working automatically. Otherwise the water supply equipment will working and make sure the water pressure is enough.
B, equipped with small water pump or pneumatic tank, when water supply pressure is low, automatically shut down the main pump, and start the small water pump and pneumatic tank, by that way can save electric when there is small flow and zero flow.

3. Equipment functional characteristics
A, non-negative pressure
Frequency conversion water supply equipment connect with municipal pipeline directly, increase its water pressure from municipal pipeline, and will not result in a municipal tap water pipe network non-negative pressure.
B, Pressure setting
 By adjusting the pressure controlling valve, we can set the municipal tap water pipe network permission water absorption pressure.
C, Pressure superposed
When exceed licensing suction pressure and flow rate, we can increase the pressure on the basis of tap water pipe network. Compared with common reservoir, pressure superposed mode can reduce pump stations or (and) reduce the rotation speed, then we can achieve energy saving purpose.
D, Variable-frequency constant-pressure
Equipment is always detecting the outlet water pressure through pressure sensor, After detection, compare the detection value with given value, then to determine the number of water pump and the output frequency from the transducer ( motors and pumps rotation speed) ,then adjust the water pressure to meet the water tracking curve.
E, No noise
Considering the environment requirements, we adopt the no noise professional transducer
F, Blackout without water-break
The equipment will shift it to municipal tap water supplying mode automatically when there has blackout.
G, Supermatic
The equipment can achieve supermatic control, manual/automatic shift, main and vice water pump can be changed, pressure adjustment, constant pressure,high and low voltage protection, out of phase protection, electric leakage protection, overload protection, over temperature protection, lack water protection, leakage detection compensation, tripping protection.

4. Operation theory
According to users requirements, set the feed water pressure value first, then open the power and begin to run, pressure sensor monitoring the tap water network pressure, converted pressure information to electrical signals and send them to the programmable controller or microcomputer controller, after analysis and processing, transmit the signals to frequency converter to control the operation of the water pump, when water consumption increases, the output voltage and frequency increases, the RPM of the water pump will increase, then the output water yield will increase . When there has several sets of water pump are working, the variable frequency will become to power frequency, the signal will control the pressure to be enough. When it is small flow in the night, just the variable frequency water pump is working, the variable frequency water pump can protect the pressure.

5. Application
A, new residential quarters, villas, office buildings, multiple-use building water supplying.
B, high-rise buildings, fire water, senior hotels etc. water supplying.
C, pressure water supply, the ground tank water-supply system, etc.
D, many kinds of water cooling and supplying system, hot water boiler.
E, the middle pressure superposed pump station in water plant, secondary pressure superposed for tap water .
F, various production of industrial and mining enterprises, living water, pipe network voltage stability.
G, various types of circulating water, cooling water supplying system.
H, tap water pressure can not meet the requirement of living and fire water,then need the pressure superposed.