ZW(L) Booster & Pressure-Stabilizing Unit for Firefighting Systems

ZW(L) Booster & Pressure-Stabilizing Unit for Firefighting Systems

ZW(L) Fire Booster & Pressure-Stabilizing Unit | Maintains required pressure at the most unfavorable point

  • Pressure maintenance: Keeps hydrant/sprinkler network pressure within the specified setpoint band.
  • Instant water reserve: Diaphragm tank provides initial firefighting water reserve for immediate discharge.
  • Automatic start/stop control: Preset pressure points command booster/stabilizing pump operation.
  • Packaged integration: Tank + pump set + valves/instruments + control panel for rapid on-site integration.
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Product Overview

ZWL Fire Pressure Boosting & Stabilizing Equipment is an integrated fire water pressure maintenance system designed for hydrant and sprinkler standby applications.

It automatically maintains pipeline pressure, compensates for minor leakage, and ensures immediate system response during fire emergencies.

It is widely applied in high-rise buildings, commercial complexes, industrial plants, and dedicated fire protection water supply systems.

✔ Designed for automatic sprinkler systems requiring immediate response, stable pressure, and dependable fire water delivery.

Model Designation

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Applications

  • Standby pressure maintenance for fire hydrant networks in high-rise buildings
  • Pressure stabilization for automatic sprinkler systems in commercial facilities
  • Fire water replenishment systems in industrial manufacturing plants
  • Booster and stabilizing duty for underground fire water pipe networks
  • Retrofit fire protection systems requiring automatic pressure maintenance

Engineering Advantages

  • Multi-pump coordinated control maintains constant fire pipeline pressure under standby conditions.
  • Automatic pressure sensing minimizes unnecessary pump cycling and reduces energy consumption.
  • Compact skid-mounted construction simplifies installation and reduces plant room footprint.
  • Integrated control cabinet enables automatic duty, standby, alarm, and fault switching.
  • Reliable emergency startup ensures immediate fire water availability when system pressure drops.
✔ Engineered for continuous standby service, rapid pressure recovery, and dependable automatic fire system readiness.

System Components

ZWL Fire Pressure Boosting & Stabilizing Equipment mainly consists of:

  • Fire jockey pump
  • Standby pressure stabilizing pump
  • Pressure vessel
  • Pressure transmitter and gauges
  • Intelligent control cabinet
  • Base frame and pipeline manifold
  • Valves, check valves, and accessories

Technical Specifications

Service Conditions

  • Application: Fire hydrant and sprinkler pressure maintenance systems
  • Medium: Clean water without solid particles
  • Installation: Indoor fire pump room or dedicated equipment area

Operating Conditions

  • Flow Rate: 1 – 30 m³/h
  • Head: 15 – 120 m
  • Power Range: 0.75 – 55 kW
  • Speed: 2900 rpm
  • Liquid Temperature: ≤ 80°C
  • Working Pressure: ≤ 1.6 MPa

Detailed parameter tables are provided below.

Installation & Dimensions

Installation Diagram

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Performance Data

No. Name
1 Pressure Tank
2 Pressure Gauge
3 Check Valve
No. Name
6 Water Pump
5 Rubber Expansion Joint
6 Water Pump
Tank Model Φ H A A1 L L1
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 & Pressure-Stabilizing
Unit Model
Fire Pressure P1
(MPa)
 Vertical Diaphragm Pressure Tank Matched Pump
Operating Weight
(kg)
Operating Pressure
(MPa)
 Stabilizing Water Volume (L)
Tank Model Working Pressure Ratio Fire Storage Water Volume (L) Pump Model
Rated Volume Effective Volume
1 ZW(L)-I-X-7 0.1 SQL800*0.6 0.60 300 319 25LG3-10*4 1.5KW 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 1.5KW 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 1.5KW 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 1.5KW 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 1.5KW 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 1.5KW 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 2.2KW 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 2.2KW 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 2.2KW 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 3KW 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 4KW 1709
P1=1.00 Ps1=1.21
P2=1.19 Ps2=1.27
 50
No.
Booster & Pressure-Stabilizing
Unit Model
Fire Pressure P1
(MPa)
 Vertical Diaphragm Pressure Tank Matched Pump
Operating Weight
(kg)
Operating Pressure
(MPa)
 Stabilizing Water Volume (L)
Tank Model Working Pressure Ratio Fire Storage Water Volume (L) Pump Model
Rated Volume Effective Volume
12 ZW(L)-II-X- A 0.22-0.38 SQL1000*0.6 0.78 300 302 25LG3-10*6 2.2KW 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 2.2KW 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 3KW 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 4KW 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 4KW 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 2.2KW 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 2.2KW 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 3KW 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 4KW 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 4KW 4156
P1=1.00 Ps1=1.30
P2=1.27 Ps2=1.35
 64
Note:
1. Symbols for operating pressure in the table:
P1 — Charging pressure of the pressure tank (required fire pressure) (MPa)   P2 — Start pressure of the fire pump (MPa)
Ps1 — Start pressure of the booster / pressure-stabilizing pump (MPa)   Ps2 — Stop pressure of the booster / pressure-stabilizing pump (MPa)
2. Items No. 1–6 are Type I units, generally installed in the high-level water tank room (with the most unfavorable hydrant located below the “unit”).
3. Items No. 7–21 are Type II units, usually installed in the fire pump room or water storage tank room; the listed fire pressure range and matched pumps are for selection reference.
4. Pump models listed are those of  Chaodun Pump Factory; other pumps can be selected according to the required flow rate and head.

How to Select a Pump Model

  • Determine required standby pressure based on the highest fire system terminal.
  • Calculate leakage compensation flow for hydrant and sprinkler pipe networks.
  • Verify system static pressure and allowable pressure fluctuation range.
  • Select vessel volume according to startup frequency requirements.
  • Confirm duty and standby pump configuration based on project fire code.
✔ Proper model selection ensures stable standby pressure, minimizes pump cycling, and guarantees emergency fire response.

Engineering Notes

  • The system is intended for standby pressure maintenance, not primary fire pumping duty.
  • Pressure vessel sizing directly affects pump startup frequency and service life.
  • Dual-pump configuration is recommended for critical fire protection systems.
  • Control logic should coordinate with the main fire pump control system.
  • Suction piping shall ensure stable water supply under standby conditions.

Compliance & Quality Assurance

  • Hydraulic performance testing for each pump set
  • Pressure vessel leakage and pressure retention testing
  • Electrical control panel functional verification
  • Material traceability for major wetted components
  • Optional third-party inspection and witness testing

Safety Notices

  • Do not operate under dry-running conditions.
  • Ensure system is fully primed before commissioning.
  • Disconnect electrical power before maintenance.
  • Verify pressure vessel pre-charge before startup.

OEM & Customization

This equipment supports engineered configuration and project-based customization. Technical modifications can be made according to fire system requirements and installation conditions.

Available options include:

  • Motor voltage and frequency
  • Pump configuration and standby arrangement
  • Pressure vessel capacity
  • Control logic and communication interface
  • Surface coating and corrosion protection

Configuration is determined based on duty point and project specifications.

FAQs

Q1: Can the system operate under VFD control?
A: Yes, variable frequency control is available for precise pressure maintenance.

Q2: What is the maximum allowable working pressure?
A: Standard design pressure is up to 1.6 MPa.

Q3: What sealing options are available?
A: Mechanical seals suitable for clean water fire applications are standard.

Q4: Is dual-pump redundancy recommended?
A: Yes, dual-pump arrangements are preferred for critical fire systems.

Q5: What is the recommended pressure vessel sizing method?
A: Vessel volume should be selected based on allowable hourly starts.

Q6: Which fire protection systems is it suitable for?
A: It is suitable for hydrant, sprinkler, and combined fire systems.

Q7: Can the control panel integrate with BMS or fire alarm systems?
A: Yes, optional communication protocols and dry contacts are available.