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Home > Products > Constant Pressure Water Refilling Device > AC Drive Constant Pressure Water Supply System

AC Drive Constant Pressure Water Supply System

Basic Info

Model No.:  YL-600

Product Description

Model NO.: YL-600

Water Pump: 2 Units:One Work One Standby

Check Valve: 1 Piece

Working Pressure: 1.0MPa,

Power Supply: 220V,50Hz,Single Phase

Specification: to be practical

HS Code: 842121999

Material for Expansion Tank: Carbon Steel

Safety Valve: 1 Piece

Gate Valve: 1 Piece

Max Working Temperature: 100 Centigrade

Trademark: YLD

Origin: Jiangyin, China

Energy saving principle

According to the water pump working principle: the water flow is direct ratio to the water pump's motor speed, the water pump's lift is direct ratio to the square of water pump motor's speed, and the shaft power is equal to the product of water flow and list, so the shaft power is direct ratio to the cube of motor speed. Therefore, the water pump's power can be changed by the pump motor's speed.

The flow formula: Q∝N H∝N2 KW=Q*H∝N3

Q means flow,N means speed,H means lift,KW means shaft power.

For example: the frequency reduce from 50HZ to 45HZ, then P45/P50=(45/50)3= 0.729, i.e. P45=0.729 P50;

The frequency reduce from 50HZ to 40HZ, then P40/P50=(40/50)3= 0.512, i.e. P40=0.512 P50.

Generally the water pump is determined according to the water supply system's maximum power requirement, but in practical experience, the water supply system doesn't need to work in its maximum power all the time. Normally it adopts throttle valve to control water flow, but the pump motor working in full load all the time, then it wastes electricity consumption. However, after install variable frequency drive to the system, it will work more smooth and stable, to control water supply by adjusting pump motor speed, and earn investment back by electricity saving in low speed running.

The pump motor is output link, the motor speed is controlled by variable frequency AC drive to achieve variable flow with constant pressure control. The AC drive receives signal from PID controller to control the pump motor speed, pressure sensor detects pipe network water pressure and sends signal to PID controller, and adjusts AC drive's output frequency by PID controller, to achieve a closed-loop control system.

The advantages of constant pressure systems:

Support high volume needs

Variable speed monitors demand

Mechanical stress on the pump is reduced

Constant pressure regardless of fluctuation

Saves energy consumption and costs

Save space with a smaller pressure tank as needed

Can easily be expanded for future needs

model Overall Volume (m3) Adjusted volume
Inlet and outlet (mm) Height of device(H) Diameter of tank
Length of trestle
Width of trestle
Weight of tank (Kg)
YL-400 0.125 0.038 25 1200 400 1200 700 150
YL-600 0.4 0.15 50 2000 600 1500 800 250.1
YL-800 0.90 0.35 50 2500 800 1800 900 325.7
YL-1000 1.37 0.41 65 2680 1000 2000 1100 430.4
YL-1200 2.30 0.59 65 2970 1200 2200 1300 815
YL-1400 3.40 1.02 80 3350 1400 2400 1400 1150
YL-1600 5.034 1.57 80 3600 1600 2600 1600 1367
YL-1800 7.06 2.12 100 3600 1800 2800 1900 1863
YL-2000 9.42 2.85 100 3800 2000 3000 2100 2281

The Variable Frequency and Speed Regulation Constant Pressure Water Supply System Based on PLC and Fuzzy Control

For solving the problem of poor quality and waste of electric energy coursed by water supply mode of a high water tower and a direct water pump, introduce a constant pressure supply water system, which adopts embedded fuzzy control technology, using PLC and frequency convener as its core. When the system runs, water pressure of the pipe is inputted into the PLC from terminal X0 through pressure transmitter. Comparing the value of measured pressure with its set value, PLC controls the work frequency of the frequency converter by the output signal on fuzzy calculation in order to control rotation speed of water pump and adjust water pressure of the pipe. The real time control performance to the water pressure of water supply system designed in this paper was proved to be all-right according to the experimentation validated. The hard ware module is steady-going and reliable, and the fuzzy controller is proper and valid and can guarantee the better stability of water pressure.

How Constant Water Pressure Systems Work?

Let's say that the system installed is a C.P 75 Sub- Drive 1-1/2 hp (20 gpm ) with a set pressure of 65 psi, as you open up the kitchen faucet which takes approximately 3 gpm the pressure transducer reads the pressure drop and sends the signal to the drive which then ramps up the pump to maybe 1800 rpms, because the demand is only 3 gpm the pump doesn't need to spin any faster to maintain the 65 psi set pressure, as you open up additional faucets creating more of a demand the rpms of the motor speed up to meet the demand and maintain the 65 psi set pressure. As the demand subsides the rpms slow down until the pump go's into sleep mode when no water is being used.

The advantages are the electric that runs the pump is more economical in that it's a 3 phase motor, no pressure fluctuations when water is being used at different locations in the house, the entire system is wall mounted with a small pressure tank which free's up floor space. Constant water pressure systems come in a variety of models ranging from 20 gpm through 90 gpm.

Contact us if you need more details on Constant-Pressure Equipment. We are ready to answer your questions on packaging, logistics, certification or any other aspects about Water Pressurization Unit、Water Refilling Device. If these products fail to match your need, please contact us and we would like to provide relevant information.

Product Categories : Constant Pressure Water Refilling Device

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