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CA-FIRE ZSFC Type Dry Alarm Valve Product Introduction

For ZSFC Series Dry Alarm Valve (ZSFC 100-1.6, ZSFC 150-1.6, ZSFC 200-1.6)

0. Company Introduction

CA-FIRE Fire Protection Co., LTD, founded in 2012 and located in Quanzhou, China, specializes in the research, development, and manufacturing of high-quality firefighting equipment. Our products include fire sprinklers (FM certified), hydrants, alarm valves, foam systems, and nozzles (CCC and CE certified). We are committed to providing reliable, durable, and compliant fire protection solutions for residential, commercial, and industrial buildings worldwide.CA-FIRE specializes in high-quality fire protection equipment. We provide a wide range of products to meet diverse fire safety needs, including: Fire Sprinklers; Indoor and Outdoor Fire Hydrants; Alarm Valves, Wet and Deluge Valves; Foam Systems, Foam Bladder Tanks, and Foam Generators; Fire Nozzles, Water Monitors, and Fire Hoses; Hose Reels, Couplings, and Accessories; Valves and Signal Devices. All products are manufactured with strict quality control and meet international fire protection standards. Custom sizes and solutions are available to suit specific project requirements.

1. Product Overview & Core Advantages

1.1 Product Overview

The ZSFC Type Dry Alarm Valve is an innovative 1:5 differential external reset valve, forming a dry alarm system with linked alarm devices, system pipelines, gas supply systems, and water supply systems. Developed based on wet systems, it is a closed-type system specifically designed for automatic sprinkler systems in cold and high-temperature environments-where traditional wet systems may freeze or malfunction. It adopts an eccentric valve clack that seals two eccentric valve seats (inner water valve seat, outer air valve seat) in standby mode. Pre-filled water (enhancing sealing) and compressed air above the valve clack isolate the fire-fighting pressure water on the supply side. When sprinklers activate, system-side gas pressure drops rapidly, opening the valve clack to allow water flow for fire suppression while triggering the pressure switch and hydraulic alarm bell via the intermediate chamber. Equipped with anti-reset and external reset devices, the valve clack requires manual reset via the external handle after fire extinguishment.

1.2 Core Advantages

Extreme Temperature Adaptability: Ideal for cold and high-temperature locations, solving the freezing or overheating issues of wet systems.

Differential & Anti-Reset Design: 1:5 differential structure ensures sensitive activation; anti-reset device keeps the valve clack open during fire, preventing accidental closure.

External Reset Convenience: Equipped with an external reset handle for easy post-fire reset without complex disassembly.

Reliable Sealing Performance: Pre-filled water enhances valve clack sealing; dual valve seats (water/air) ensure tight isolation of water and gas in standby mode.

Integrated Alarm System: Comes with hydraulic alarm bell and pressure switch for timely fire alerts, improving emergency response efficiency.

Wide Pressure Compatibility: Water supply pressure ranges from 0.14MPa to 1.6MPa, with matching system-side air pressure (0.04MPa~0.64MPa), adapting to diverse system configurations.

2. Technical Specifications

2.1 Overall Dimensions (mm)

Model	h	H	A	B	M	N	K (Φ)	N-L (8-Φ)
ZSFC 100-1.6	375	515	230	400	260	180	180	18
ZSFC 150-1.6	455	515	275	430	260	200	210	18
ZSFC 200-1.6	610	550	340	450	320	260	240	22

2.2 Water Supply & System-Side Air Pressure (MPa)

Water Pressure on Supply Side	Minimum Air Pressure on System Side	Maximum Air Pressure on System Side
0.14	0.04	0.06
0.2	0.06	0.08
0.3	0.10	0.12
0.4	0.13	0.16
0.5	0.17	0.20
0.6	0.20	0.24
0.7	0.23	0.28
0.8	0.27	0.32
0.9	0.30	0.36
1.0	0.33	0.40
1.2	0.40	0.48
1.4	0.47	0.56
1.6	0.54	0.64

2.3 Core Configuration

Main Components: Valve body assembly, hydraulic alarm bell, pressure switch, alarm pipeline, pressure gauges (2 pcs), operation manual, certificate of conformity.

Valve Structure: Eccentric valve clack, dual valve seats (water/air), external reset handle, anti-reset device, bottom water funnel, drip valve.

Certifications: CCC, CE

3. Installation, Commissioning & Maintenance Instructions

3.1 Installation Guidelines

Installation Orientation: Install vertically on the system pipeline with approximately 0.5m of space around for maintenance and operation.

Pipeline Preparation: Thoroughly flush the water supply pipeline to remove debris and ensure clean water quality before installation.

Valve Protection: Apply lifting force only to the valve body flange during installation-do not exert force on other parts or pipelines to avoid damage.

Valve Cavity Cleaning: Check for foreign residues in the valve cavity; clean and rinse the cavity, valve clack, and valve seats if necessary.

System Assembly: Install the dry alarm valve as per Figure 2, then sequentially mount the hydraulic alarm bell, pressure switch, and air pressure maintaining device.

Auxiliary Valves: Install fire signal butterfly valves (or gate valves) at the inlet and outlet for convenient maintenance and commissioning.

Gas Source Connection: Connect the gas source and verify all components are correctly and completely installed.

3.2 Commissioning Steps

Initial Setup: Push the reset handle to close the valve clack; close all valves as specified in the diagram.

Bottom Water Injection: Open the bottom water ball valve, fill the bottom water funnel until full (minor leakage from the drip valve is normal), then drain excess water via the test ball valve and close both valves.

Pressure Regulator Adjustment: Pull up and loosen the pressure regulator knob counterclockwise; start the air compressor (set output pressure 0.1~0.2MPa higher than system air pressure).

Air Pressure Calibration: Turn the pressure regulator knob clockwise to adjust to the minimum system-side air pressure (matching supply water pressure in Table 2), then press the knob to lock.

Air Charging: Open the outlet signal butterfly valve, air inlet ball valve, and quick air charging valve. Close the quick air charging valve when system air pressure approaches the minimum value.

Leakage Check: After pressure stabilization, confirm no continuous water flows from the drip valve (initial minor leakage is acceptable). If leakage persists, inspect and clean the valve clack seats.

Water Supply Test: Slowly open the inlet signal butterfly valve to inject rated pressure water. Commissioning is complete if minor drip stops; re-inspect for foreign objects if leakage continues.

3.3 Maintenance Tips

Annual Inspection: Conduct a full inspection of the valve and accessories at least once a year, performed by experienced personnel with temporary fire prevention measures in place.

Maintenance Steps: Close the inlet signal butterfly valve, drain water and exhaust air; remove the valve cover and sealing gasket; inspect, clean, and replace the valve clack's rubber sealing gasket (anti-aging period: 1 year).

Component Check: Verify the reset stopper and reset handle are in normal working condition; re-assemble components in sequence after maintenance.

Regular Tests: Perform alarm tests (open alarm test valve), pipeline water supply tests (open drain valve), and switch function tests (open test ball valve) periodically to ensure system reliability.

4. Packaging & Transportation

Our products are carefully packaged using export-standard wooden crates or wooden pallets to ensure safe transportation. This packaging method provides stability, prevents damage during handling, and guarantees that all items arrive at the customer's location in excellent condition.

5. Application Scenarios

Cold Regions: Warehouses, garages, industrial workshops, and commercial buildings in areas prone to freezing (where wet systems may ice up).

High-Temperature Environments: Factories, power plants, and facilities with high ambient temperatures (where wet systems may suffer from water evaporation or component damage).

General Fire Protection Systems: Residential complexes, office buildings, shopping malls, and logistics centers requiring reliable dry sprinkler systems.

Specialized Facilities: Subway tunnels, underground garages, and unheated storage facilities in cold climates.

6. Frequently Asked Questions (FAQ)

Q: What makes this dry alarm valve suitable for cold environments?A: It is a closed dry system with no standing water in the pipeline network, avoiding freezing and bursting of pipes in low temperatures-solving the core limitation of wet systems.

Q: How to reset the valve after a fire?A: After extinguishing the fire and clearing the alarm, press the external reset handle to return the valve clack to the closed position. Follow the commissioning procedure to re-establish system pressure.

Q: How often should the rubber sealing gasket be replaced?A: The valve clack's rubber sealing gasket has an anti-aging period of 1 year. We recommend annual replacement during routine maintenance to ensure sealing performance.

Q: What is the purpose of the pre-filled water in the valve?A: Pre-filled water enhances the sealing performance of the valve clack, ensuring tight isolation between the water supply side and system side in standby mode, preventing gas leakage or water seepage.

Q: Can the valve be used with any air compressor?A: It is compatible with standard air compressors capable of outputting pressure 0.1~0.2MPa higher than the required system-side air pressure. Ensure the compressor's air quality is clean (free of oil and debris) to avoid valve damage.

7. Product Comparison Table (vs. Competitors)

Comparison Item	Our ZSFC Type Dry Alarm Valve	Competitor A	Competitor B
International Certification	CCC+CE	Only CE	No key certifications
Differential Design	1:5 ratio (sensitive activation)	1:3 ratio (slow response)	No differential design
Reset Method	External handle (easy operation)	Internal reset (complex disassembly)	Manual disassembly required
Temperature Adaptability	Cold + high-temperature environments	Cold environments only	Limited to normal temperature
Sealing Performance	Pre-filled water + dual valve seats	Single valve seat (prone to leakage)	No pre-filled water (poor sealing)
Matching Pressure Range	0.14~1.6MPa (wide compatibility)	0.3~1.2MPa (narrow range)	0.5~1.0MPa (very limited)
Maintenance Cost (Annual)	$40/unit (sealing gasket replacement)	$60/unit (frequent component replacement)	$50/unit (high leakage repair cost)
After-Sales Warranty	2 years + technical support	1 year	No warranty
Core Accessories	Hydraulic alarm bell + pressure switch (included)	Pressure switch only (alarm bell sold separately)	No included accessories

8. Contact: Dulcia

Email: sales8@ca-fire.com

Tel/WhatsApp: +86 191 6381 1547

WeChat: Dulcia8

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