Description
A wet alarm valve is a crucial component in a fire protection system, especially in systems designed to keep water constantly in the pipes.The primary function of a wet alarm valve is to detect the presence of water flow in the system and trigger an alarm. This is crucial for early detection of fire and activation of fire sprinklers.
Components and Operation:
- Valve Body: The main component of the wet alarm valve is the valve body, which controls the flow of water through the system. It is typically installed in a vertical position and is connected to the water supply line.
- Alarm Trim: The alarm trim includes the components that detect water flow and trigger the alarm. It typically consists of:
- Flow Switch: Senses the movement of water and activates the alarm system.
- Alarm Bell or Horn: Emits an audible alarm when the system detects water flow.
- Pressure Switch: Monitors the pressure in the system and can also be linked to the alarm system.
- Pressure Relief Valve: This valve releases excess pressure from the system to prevent damage and maintain safe operating conditions.
- Drain Valve: Used to drain water from the system for maintenance or inspection purposes.
- Test Valve: Allows for testing the alarm system without activating the full system. It helps ensure that the alarm and other components are functioning correctly.
Function:
- System Monitoring: The wet alarm valve remains open under normal conditions, allowing water to flow through the system and maintain a pressurized state.
- Detection: When a fire triggers the sprinkler system, water flows through the pipes and the wet alarm valve. This flow of water activates the flow switch.
- Alarm Activation: The flow switch sends a signal to the alarm system, which triggers the alarm bell or horn to alert occupants and emergency services of a potential fire.
