Wet Alarm Check Valve

Overview

The Wet Alarm Check Valve Assembly is a key component used in wet pipe fire sprinkler systems. It is designed to detect water flow caused by the activation of one or more automatic sprinklers and to initiate both local and remote fire alarms.

The assembly integrates a wet alarm valve, retard chamber, pressure gauges, water motor alarm, pressure switch, drain valve, filter, and associated trim components, providing reliable alarm activation while minimizing false alarms caused by pressure fluctuations.

Product Description

The Wet Alarm Check Valve functions as a water flow alarm initiating device in wet pipe sprinkler systems. When a sprinkler operates due to fire exposure, water flows through the system, causing the alarm check valve clapper to open. This allows continuous water flow into the system and simultaneously activates the water motor alarm and pressure switches.

The valve is designed for installation under both variable and constant water supply pressure conditions. A built-in bypass line within the valve trim allows a small amount of water to bypass the clapper during temporary pressure surges, effectively eliminating the risk of false alarms.

For proper operation, the valve must be installed vertically with the water flow direction pointing upward, and sufficient space should be reserved for inspection, repair, and maintenance.

Technical Features

Features

• Reliable Water Flow Detection
  Activates mechanical and electrical alarms immediately upon sprinkler operation.

• False Alarm Prevention Design
  Retard chamber and bypass line absorb water pressure surges, preventing nuisance alarms.

• Complete Valve Assembly
  Includes wet alarm valve, retard chamber, pressure gauges, water motor alarm, pressure switch, drain valve, and filter.

• Stable Performance Under Various Pressure Conditions
  Suitable for systems with fluctuating or constant water supply pressure.

• Easy Observation & Maintenance
  Designed for installation in locations with clear visibility and easy access.

• Vertical Installation Design
  Ensures correct clapper operation and accurate alarm activation.

Installation & Operation Notes

• Install the wet alarm check valve vertically on a pipeline that has been pressure-tested and thoroughly cleaned.

• Ensure the arrow indicating water flow direction points upward.

• Reserve sufficient operating space for future inspection and maintenance.

• The pipeline inner wall must be treated with a rust-proof coating and free from debris or contaminants before installation.

Installation Procedure

Step 1
Clean the entire pipeline system before installation. Ensure there is no dirt, debris, or residue inside the pipes.

Step 2
To facilitate easy identification of alarm conditions, it is recommended to provide an open discharge port or a clearly visible water discharge point.

Step 3
Check the flange connection, sealing condition, and valve disc movement.
Conduct a leakage test at twice the rated working pressure.
After testing, the valve disc must remain leak-free. Replace damaged parts or eliminate faults before final assembly.

Application

• Fire protection systems (sprinkler and water-based fire fighting pipelines)

• Municipal water supply and distribution systems

• Underground and buried piping installations

• Commercial and industrial buildings

• Pump stations and mechanical rooms

• Infrastructure and utility projects

• Retrofit projects combining flanged and grooved piping systems

Faq

Q1: What is the main function of a wet alarm check valve?

It detects water flow caused by sprinkler activation and initiates both local mechanical alarms and remote electrical signals.

Q2: How does this valve prevent false alarms?

A bypass line and retard chamber absorb temporary pressure surges, allowing small amounts of water to pass without triggering alarms.

Q3: Can it be installed under fluctuating water pressure?

Yes. The valve is designed to operate reliably under both variable and constant water supply pressure conditions.

Q4: What position should the valve be installed in?

The valve must be installed vertically, with the water flow direction pointing upward.

Q5: What components are included in the assembly?

The assembly includes the wet alarm valve, retard chamber, pressure gauges, water motor alarm, pressure switch, drain valve, filter, and trim components.

Q6: What maintenance space is required?

Sufficient space should be reserved around the valve for inspection, testing, and maintenance operations.