The constant pressure water supply unit is the core supporting equipment for closed-loop water systems, known as the "pressure stabilizer" of water systems. It integrates functions such as automatic pressure regulation, automatic water replenishment, overpressure relief, and degassing/oxygen removal. Designed to solve problems such as pressure fluctuations, insufficient water volume, air blockage, and corrosion caused by system leakage or temperature changes, it is widely used in HVAC systems, industrial cooling, boiler heating, chemical process water, and other scenarios to ensure stable and efficient system operation.
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+86 15936525232The unit adopts a skid-mounted integrated design, consisting of the following main components:
Pressure Stabilizing Tank (Diaphragm Pressure Vessel): Made of carbon steel or stainless steel. Equipped with an internal rubber diaphragm to store compressed air for pressure buffering and energy accumulation. It is the core component for pressure regulation.
Water Make-up Pump Set: Mainly vertical stainless steel multistage pumps. The one-operating-one-standby configuration is optional. It supports auto start-stop and variable frequency operation to replenish water and boost pressure for the system.
Intelligent Electric Control Cabinet: Controlled by PLC or relays. Equipped with pressure transmitters for real-time monitoring, enabling automatic water replenishment, overpressure relief, fault alarm and remote monitoring.
Pipe & Valve Assembly: Composed of safety valve, check valve, filter, pressure gauge and drain valve, ensuring safe operation of the equipment.
Degassing Tank (Optional): Adopts vacuum degassing to remove free gas inside the system and avoid cavitation, air blockage and corrosion.
Pressure Stabilization: During operation, system pressure may drop due to temperature changes or water leakage. The compressed air inside the tank pushes the diaphragm to deliver stored water into the system and keep pressure stable. When system pressure rises excessively, water flows back into the tank to compress air and realize pressure buffering.
Automatic Water Replenishment: When the pressure drops below the preset lower limit, the pressure sensor activates the make-up pump to supply water. The pump will shut down automatically once the pressure reaches the upper limit.
Overpressure Protection: The safety valve releases pressure automatically when the pressure exceeds the safety threshold, preventing pipeline rupture and equipment damage.
Degassing & Deoxygenation (Models with degassing function): Circulating water flows into the degassing tank. Dissolved gas is separated under vacuum and discharged out of the system, lowering risks of pipeline corrosion and cavitation.
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Advantages |
Description |
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Precise pressure control & stable operation |
Dual control by pressure vessel and pressure sensor. Pressure fluctuation ≤ ±0.02MPa, eliminating pipeline vibration and abnormal valve noise. |
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Fully automatic & unattended operation |
Auto start-stop, water replenishment and pressure relief after parameter setting. Equipped with fault alarm and remote monitoring function. |
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Energy saving & low operation cost |
Pumps run intermittently or with variable frequency. Energy consumption is reduced by over 30% compared with traditional elevated water tank pressure regulation. |
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Integrated skid design & easy installation |
Pre-assembled and tested in factory. Only pipeline and power connection are required on site, greatly shortening construction period. |
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Corrosion resistance & wide adaptability |
Tank with anti-corrosion carbon steel or stainless steel construction. All wetted parts of pumps are made of stainless steel, suitable for clean water and weakly corrosive media. |
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Optional degassing function to extend service life |
Removes dissolved oxygen and gas, reducing pipeline corrosion, heat exchanger scaling and cavitation damage. |
HVAC Systems: Chilled water and cooling water circulation systems. Stabilize system pressure and prevent unit cavitation.
Boiler Heating Systems: Water replenishment and pressure stabilization for hot water and steam boilers to ensure safe boiler operation.
Industrial Circulating Water Systems: Process cooling water systems for chemical, pharmaceutical and food industries. Stabilize pressure and reduce unexpected shutdowns.
Building Water Supply & Drainage Systems: Water supply for high-rise buildings and fire-fighting pressure stabilization systems to maintain constant pipe network
1.Check tank pressure regularly. If the pressure is lower than the set value, refill nitrogen to the normal range.
2.Inspect pump operation monthly and replace lubricating oil periodically to avoid mechanical failures.
3.Examine wiring of electric cabinet, pressure sensors and safety valves quarterly to guarantee sensitive and reliable performance.
4.Conduct anti-corrosion inspection on tanks and pipelines every year. Touch up paint or replace corroded components in a timely manner.
We provide tailored solutions according to on-site working conditions:
Custom tank volume, pressure grade and material
Custom pump quantity (single pump / one operational & one standby / two operational & one standby) and power
Optional functional modules: degassing unit, variable frequency drive, remote monitoring, etc.
Custom flange specifications for inlet & outlet and overall installation dimensions
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Item |
Parameter |
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Working Pressure |
0.6-1.6MPa (Customizable) |
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Working Temperature |
0-95℃ (High-temperature version available for special working conditions) |
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Water Replenishment Flow |
1-50m³/h (Customized on demand) |
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Control Mode |
Relay control / PLC variable frequency control |
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Tank Material |
Anti-corrosion Q235 carbon steel / 304 / 316L stainless steel |
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Pump Material |
304 stainless steel (Standard configuration) |
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Power Supply |
380V/50Hz, 3-phase 4-wire system |
| Item | DY600-L | DY800-L | DY1000-L | DY1200-L | DY1400-L | DY1600-L | DY1800-L |
| Model | DY600-L | DY800-L | DY1000-L | DY1200-L | DY1400-L | DY1600-L | DY1800-L |
| H | 2205 | 2545 | 2905 | 3305 | 3405 | 3790 | 3995 |
| H1 | 1830 | 2370 | 2630 | 3030 | 3130 | 3515 | 3720 |
| H2 | 200 | 200 | 220 | 250 | 250 | 250 | 250 |
| H3 | 80 | 80 | 100 | 100 | 100 | 100 | 100 |
| L | 2250 | 2700 | 3300 | 3370 | 3740 | 4250 | 5000 |
| - | — | — | — | 3570 | 3940 | 4450 | 5200 |
| b | 600 | 800 | 860 | 800 | 900 | 950 | 1250 |
| B | 650 | 900 | 1000 | 865 | 990 | 1090 | 1390 |
| DN | 65 | 80 | 80 | 100 | 100 | 125 | 125 |
| Weight (kg) | |||||||
| 0.6 MPa | 482 | 849 | 1167 | 1617 | 1922 | 2640 | 3020 |
| 1.0 MPa | 696 | 1303 | 1781 | 2397 | 2889 | 4000 | 4570 |
| Pump Model | |||||||
| 0.3 MPa Pump Model | CHL2-40 | CHL2-40 | CHL4-40 | CHL4-40 | CHL4-40 | CHL4-40 | CHL8-30 |
| KW | 0.55 | 0.55 | 0.75 | 0.75 | 0.75 | 0.75 | 1.1 |
| 0.6 MPa Pump Model | CDL2-70 | CDL2-70 | CDL4-807 | CDL4-807 | CDL4-80 | CDL4-80 | CDL8-80 |
| KW | 0.75 | 0.75 | 1.5 | 1.5 | 1.5 | 1.5 | 2.2 |
| 1.0 MPa Pump Model | CDL2-130 | CDL2-130 | CDL4-120 | CDL4-120 | CDL4-120 | CDL4-120 | CDL8-100 |
| KW | 1.5 | 1.5 | 2.2 | 2.2 | 2.2 | 2.2 | 4 |
