ZW(L)-HY LG Fire & Water Supply Pressure Stabilizing Set

ZW(L)-HY LG Fire & Water Supply Pressure Stabilizing Set

W/HY-LG Fire Pressure Boosting & Stabilizing Equipment | Pressure-maintaining unit for hydrant & sprinkler networks

  • Pressure stabilization: Maintains preset network pressure and compensates leakage/small demand.
  • Compact packaged set: Booster pump + tank + valves/instruments + control panel in one unit.
  • Automatic duty control: Auto start/stop with manual override and alarm/status signals.
  • System integration ready: Standard interfaces for piping, sensing points, and field commissioning.
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Product Overview

W-HY-LG Pressure Boosting & Stabilizing Equipment is an integrated fire pressure maintenance system designed to maintain constant pressure in fire protection pipeline networks.

It compensates pressure loss caused by leakage or micro-flow discharge to prevent unnecessary main fire pump activation.

It is applied in sprinkler systems, hydrant systems, and high-rise building fire standby networks requiring continuous pressure stabilization.

✔ For fire protection systems requiring automatic pressure stabilization and booster compensation under standby conditions

Model Designation

ZW(L)-HY LG Fire alt=

Applications

  • Closed-loop sprinkler systems with standby pressure monitoring
  • Fire hydrant systems in high-rise buildings
  • Fire pump rooms requiring automatic pressure compensation
  • Industrial plant fire pipeline networks
  • Underground parking garage fire standby systems

Engineering Advantages

  • Dual-pump configuration (duty/standby) improves system reliability
  • Pressure tank buffering reduces frequent pump cycling
  • Intelligent pressure sensing and automatic start-stop control
  • Compact skid-mounted structure simplifies pump room integration
  • Small-flow compensation logic prevents main fire pump false triggering
✔ Engineered to maintain stable fire pipeline pressure while minimizing mechanical wear and unnecessary main fire pump activation.

System Components

W-HY-LG Fire Boosting System Components：

  • Vertical multistage booster pump (duty/standby)
  • Pressure tank
  • Pressure transmitter / pressure switch
  • Fire control cabinet
  • Check valves and isolation valves
  • Base frame and integrated piping assembly

Technical Parameters

Service Conditions

Designed for standby pressure stabilization duty in fixed fire protection systems.

Operating Conditions

Flow rate:  /h
Head:    m
Power range:  kW
Speed:  rpm
Liquid temperature: ≤  
Working pressure: ≤

Detailed parameter tables are provided below.

Installation & Dimensions

Installation Diagram

ZW(L) Fire Pressure-Stabilizing Water Supply Unit Structure Diagram

Performance Data

No. Name
1 Diaphragm pressure tank
2 Pressure gauge
3 Check valve
No. Name
4 Rubber expansion joint
5 Pump
6 Pump
Tank model Φ (mm) H (mm) A (mm) A1 (mm) L (mm) L1 (mm)
Φ800 800 2480 800 760 1400 1200
Φ1000 1000 2800 1000 960 1600 1400
Φ1200 1200 3210 1200 1160 1800 1600

Performance Parameters

No. Booster Unit Model Fire Pressure P1 (MPa) Vertical Diaphragm Pressure Tank Matched Pump Operating Weight (kg) Operating Pressure (MPa) Stabilizing Volume (L)
Tank Model Pressure Ratio Fire Storage Volume (L) Pump Model
Rated Volume Actual Volume
1 ZW(L)-I-X-7 0.10 SQL800×0.6 0.60 300 319 25LG3-10×4 1.5 kW 1452 P1=0.10 Ps1=0.26 P2=0.23 Ps2=0.31 54
2 ZW(L)-I-Z-10 0.16 SQL800×0.6 0.80 150 159 25LG3-10×4 1.5 kW 1428 P1=0.16 Ps1=0.26 P2=0.23 Ps2=0.31 70
3 ZW(L)-I-X-10 0.16 SQL800×0.6 0.60 300 319 25LG3-10×5 1.5 kW 1474 P1=0.16 Ps1=0.36 P2=0.33 Ps2=0.42 52
4 ZW(L)-I-X-13 0.22 SQL1000×0.6 0.76 300 329 25LG3-10×4 1.5 kW 2312 P1=0.22 Ps1=0.35 P2=0.32 Ps2=0.40 97
5 ZW(L)-XZ-10 0.16 SQL1000×0.6 0.65 450 480 25LG3-10×4 1.5 kW 2312 P1=0.16 Ps1=0.33 P2=0.30 Ps2=0.38 86
6 ZW(L)-XZ-13 0.22 SQL1000×0.6 0.67 450 452 25LG3-10×5 1.5 kW 2312 P1=0.22 Ps1=0.41 P2=0.38 Ps2=0.46 80
7 ZW(L)-II-Z- A 0.22–0.38 SQL800×0.6 0.80 150 159 25LG3-10×6 2.2 kW 1452 P1=0.38 Ps1=0.53 P2=0.50 Ps2=0.60 61
8 ZW(L)-II-Z- B 0.38–0.50 SQL800×1.0 0.80 150 159 25LG3-10×8 2.2 kW 1513 P1=0.50 Ps1=0.68 P2=0.65 Ps2=0.75 51
9 ZW(L)-II-Z- C 0.50–0.65 SQL1000×1.6 0.85 150 206 25LG3-10×9 2.2 kW 1653 P1=0.65 Ps1=0.81 P2=0.78 Ps2=0.86 59
10 ZW(L)-II-Z- D 0.65–0.85 SQL1000×1.6 0.85 150 206 25LG3-10×11 3 kW 1701 P1=0.85 Ps1=1.04 P2=1.02 Ps2=1.10 57
11 ZW(L)-II-Z- E 0.85–1.00 SQL1000×1.6 0.85 150 206 25LG3-10×13 4 kW 1709 P1=1.00 Ps1=1.21 P2=1.19 Ps2=1.27 50
No. Booster Unit Model Fire Pressure P1 (MPa) Vertical Diaphragm Pressure Tank Matched Pump Operating Weight (kg) Operating Pressure (MPa) Stabilizing Volume (L)
Tank Model Pressure Ratio Fire Storage Volume (L) Pump Model
Rated Volume Actual Volume
12 ZW(L)-II-X- A 0.22–0.38 SQL1000×0.6 0.78 300 302 25LG3-10×6 2.2 kW 2344 P1=0.38 Ps1=0.55 P2=0.52 Ps2=0.60 72
13 ZW(L)-II-X- B 0.38–0.50 SQL1000×1.0 0.78 300 302 25LG3-10×8 2.2 kW 2494 P1=0.50 Ps1=0.70 P2=0.67 Ps2=0.75 61
14 ZW(L)-II-X- C 0.50–0.65 SQL1000×1.6 0.78 300 302 25LG3-10×10 3 kW 2689 P1=0.65 Ps1=0.88 P2=0.86 Ps2=0.93 51
15 ZW(L)-II-X- D 0.65–0.85 SQL1000×1.6 0.85 300 355 25LG3-10×13 4 kW 2703 P1=0.85 Ps1=1.05 P2=1.02 Ps2=1.10 82
16 ZW(L)-II-X- E 0.85–1.00 SQL1000×1.6 0.88 300 355 25LG3-10×15 4 kW 2730 P1=1.00 Ps1=1.21 P2=1.19 Ps2=1.26 73
17 ZW(L)-II-XZ- A 0.22–0.38 SQL1200×0.6 0.80 450 474 25LG3-10×6 2.2 kW 3641 P1=0.38 Ps1=0.53 P2=0.50 Ps2=0.58 133
18 ZW(L)-II-XZ- B 0.38–0.50 SQL1200×1.0 0.80 450 474 25LG3-10×8 2.2 kW 3947 P1=0.50 Ps1=0.68 P2=0.65 Ps2=0.73 110
19 ZW(L)-II-XZ- C 0.50–0.65 SQL1200×1.6 0.80 450 474 25LG3-10×10 3 kW 3961 P1=0.65 Ps1=0.87 P2=0.84 Ps2=0.92 90
20 ZW(L)-II-XZ- D 0.65–0.85 SQL1200×1.6 0.80 450 474 25LG3-10×12 4 kW 4124 P1=0.85 Ps1=1.12 P2=1.09 Ps2=1.17 73
21 ZW(L)-II-XZ- E 0.85–1.00 SQL1200×1.6 0.80 450 474 25LG3-10×14 4 kW 4156 P1=1.00 Ps1=1.30 P2=1.27 Ps2=1.35 64
Note:
1) P1 – Inflation pressure of the diaphragm tank (required fire pressure) (MPa);
P2 – Fire pump start pressure (MPa);
Ps1 – Booster–stabilizing pump start pressure (MPa);
Ps2 – Booster–stabilizing pump stop pressure (MPa).
2) Items No.1–6 are Type I Units, generally installed in high-level tank rooms (most unfavorable hydrant lower than the Unit).
3) Items No.7–21 are Type II Units, generally installed in fire pump rooms or water tank rooms. The corresponding fire pressure ranges and matched pumps are for selection reference.
4) The listed pump models are based on Chaodun Pump Factory products. Equivalent pumps from other manufacturers may be selected according to required flow and head.

How to Select a Pump Model

  • Determine required standby pressure setpoint of fire network
  • Calculate leakage compensation flow and test discharge allowance
  • Select pressure tank volume according to buffering requirement
  • Confirm dual-pump duty/standby requirement
  • Verify system rated pressure does not exceed 1.6 MPa
✔ Engineered to maintain stable fire pipeline pressure while minimizing mechanical wear and unnecessary main fire pump activation.

Engineering Notes

  • Tank pre-charge pressure must match system static pressure
  • Booster pump should operate within small-flow compensation range
  • Oversizing may cause pressure instability and frequent cycling
  • Electrical control logic must align with fire alarm interlock

Compliance & Quality Assurance

  • Factory hydraulic performance test for booster pumps
  • Pressure tank hydrostatic test
  • Electrical cabinet functional test
  • Insulation resistance and grounding test
  • Optional third-party inspection available

Safety Notice

  • Do not operate under dry-running condition
  • Ensure correct pressure setting before commissioning
  • Disconnect power before maintenance
  • Do not exceed rated working pressure

OEM & Customization

This pump series supports engineered configuration and duty-based matching. Technical adjustments can be made according to system requirements and installation conditions.

Available options include:
• Motor voltage & frequency
• Pressure tank capacity selection
• Control cabinet configuration (single/dual pump logic)
• Wetted parts material selection
• Surface coating and corrosion protection

Configuration is determined based on duty point and project specifications.

FAQs

Q: Can the unit operate under VFD control?
A: Yes, variable frequency configuration can be integrated for precise pressure stabilization.

Q: What is the maximum allowable working pressure?
A: Maximum allowable working pressure is 1.6 MPa.

Q: Why is a pressure tank required?
A: It provides buffering capacity and reduces frequent pump cycling.

Q: Can the system prevent frequent fire pump startup?
A: Yes, it compensates minor leakage to avoid unnecessary activation of the main fire pump.

Q: What type of pump is used in this unit?
A: Vertical multistage centrifugal pumps are typically applied.

Q: Is dual-pump configuration mandatory?
A: Dual duty/standby configuration is recommended for reliability but can be project-specific.

Q: What is the allowable liquid temperature?
A: Maximum allowable liquid temperature is 80°C.