Wet Alarm Check Valve Assembly for Firefighting

• Customization: Available
• Sprinkler Installation: Pendent;Upright;Sidewall
• Sprinkler Head Type: Closed
• Model NO.: ZSFZ
• Alarm Valve Type: Wet Alarm Valve
• Automatically Opened and Closed Repeatedly: Can Automatically Opened and Closed
• Open Fire Sprinkler System Type: Deluge System
• Closed Fire Sprinkler System: Wet Fire Sprinkler System
• Dry Alarm Valve Type: Differential Type
• Wet Alarm Valve Structure: Seat Type
• Alarm Valve Diameter: 2.5"Thru 10"/DN65 Thru DN250
• Nozzle Flow Coefficient: 115
• Deluge Valve Type: Diaphragm Type
• Product Name: Alarm Valve,Alarm Check Valve
• Installation: Vertical
• Finish: Externally Powder Coated
• Medium: for Most Water, Seawater & Brackish Water Supplies
• Connection: Flange X Flange / Groove X Groove
• Rated Pressure: 232psi/1.6 MPa/16 Bar
• Listings and Approvals: Cccf,ISO9001, ISO14001
• Application: Automatically Actuate Electric and/or Hydraulic Al
• OEM: Workable
• Transport Package: Wooden Case
• Specification: 65*50*50
• Trademark: FOREDE
• Origin: Fujian, China
• HS Code: 8481804090
• Production Capacity: 500sets/Month

Product Description

Product Description

ZSFZ Model Wet Alarm Check Valves

The ZSFZ Model Alarm Check Valves are designed for use in applications where the temperature is maintained above freezing and intended for use in wet pipe (automatic sprinkler) fire protection systems. They are installed vertically,and they are designed to automatically actuate electric and/or hydraulic alarms when there is a steady flow of water into the system that is equivalent to the discharge rate of one or more sprinklers.

The wet alarm valve is mainly composed of a valve body, a valve seat, a valve disc, a sealing gasket, a connecting rod, an annular groove bypass connecting pipe, and a pressure gauge connection pipe. The wet alarm valve should be installed on the main standpipe of the sprinkler system, and the installation height should be in accordance with the design and standard network collection requirements, and the drain pipe should not be connected to the drainage system only. The drain funnel should be connected to the nearby drain point. The matters needing attention during installation and operation of the wet alarm valve are as follows. 1. When installing the wet alarm valve, pay attention to the direction of the valve body. And carry out pipeline flushing before installation to avoid sedimentation of mud, sand and dirt, and to prevent blockage of the annular groove. 2. During installation, if it is found that even if the wet alarm valve is closed, there is still water flowing out of the drain port of the delayer, indicating that the valve flap is not tightly sealed and should be checked, repaired or updated. 3. The working status of the alarm system should be checked regularly. Generally, water can be discharged through the end test device of the automatic sprinkler system to confirm whether the pressure switch, hydraulic alarm bell and wet alarm valve are normally watered. 4. Frequently check whether the pipeline system is blocked. The inspection method is: close the valve on the pipeline to the delayer and hydraulic alarm bell, and open the ball valve of the main drain pipe. If a large amount of water flows out, the pipeline is unobstructed.

Specification

ZSFZ series Alarm Check Valve

Features:

Ductile Iron body
Galvanized pipe line
Carbon Steel Retard Chamber
Carbon SteelWater Motor Gong

Specification
Model	ZSFZ80	ZSFZ100	ZSFZ125	ZSFZ150	ZSFZ200	ZSFZ250
Size	3"/DN80	4"/DN100	5"/DN125	6"/DN150	8"DN200	10/DN250
Connection	Flange @ BS4504
Working Pressure	PN16/16bar
Testing Pressure	32 bar
Flow Switch	DC 24V.0.5

 

Packaging & Shipping

 

FAQ

1. Hydraulic Gong Audibility in High - Rise Structures

Q: In skyscrapers (50+ floors), how does vertical distance affect the water motor gong's sound, and how to ensure it's heard?
A: Sound diminishes with height due to structural barriers. Install acoustic boosters (wired to the gong) and place secondary alarms on upper floors. Opt for frequency - optimized gongs (500-1000Hz) that travel farther in vertical shafts.

2. Non - Destructive Corrosion Testing on Galvanized Pipes

Q: How to detect galvanized pipe corrosion inside the ZSFZ system without dismantling it?
A: Use ultrasonic thickness gauges on pipe exteriors to check wall thinning. For internal corrosion, insert a bore - scope camera through the valve's test port. Monitor pressure drop trends during system tests-sudden drops signal rust - caused blockages.

3. Smart Smoke Detector Integration

Q: Can ZSFZ valves connect to AI - powered smoke detectors for faster fire response?
A: Yes. Use a relay module to link the detector's output to the valve's control circuit. The AI detector can pre - trigger the flow switch upon smoke confirmation, cutting response time by 5-10 seconds.

4. Post - Earthquake Valve Checks

Q: After an earthquake, how to quickly assess the ZSFZ valve's functionality?
A: 1. Check flange bolts for looseness (retorque to specs). 2. Inspect the retard chamber for visible damage. 3. Manually actuate the flow switch to confirm it clicks. 4. Simulate flow by pouring water into the gong's inlet to test its alarm.

5. Flow Switch Calibration for Unstable Pressure

Q: In systems with fluctuating pressure (e.g., shared with industrial pumps), how to prevent false flow - switch triggers?
A: Install a pressure - compensated flow switch that adjusts its activation threshold to real - time pressure. Add a 5 - second delay in the control panel to ignore transient pressure spikes, ensuring only sustained flow (≥10L/min) activates the alarm.

Order Information

 

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