Check valves for fire protection systems help prevent unwanted reverse flow, also known as backflow, from occurring. Many check valves consist of a hinged clapper with a spring that keeps the valve closed until fluid flow from a water source opens it. The clapper then swings to an open position that allows fluid to pass in one direction, closing once more when the flow lessens and backpressure threatens.

This basic design helps keep non-potable or contaminated water from entering fire protection systems, preserving system functionality and water quality. As Leading check valves supplier and factory in China, Fluid Tech Group lead you to understand more check valves as fire protection types wtih fire safe function.

Fire Sprinkler Type – One Kinds Of Fire Protection Check Valves

Fire sprinkler check valves are a type of fire protection check valve. Check valves for fire sprinkler systems help prevent backflow and maintain system pressure. They can be part of automatic fire sprinkler systems that activate when there is a fire.

Velocity Check Valve Fire Protection – Used in Fire Protection Systems

1. Velocity check valves are a type of check valve used in fire protection systems. They are designed to allow flow in one direction but quickly close when the fluid velocity drops, helping maintain system pressure.
2. Velocity check valves are often used in fire pump systems to prevent reverse flow from city mains into the fire pumps when the pumps shut down. This helps keep city water pure.
3. The fast-acting closure helps maintain system pressure and priming, so sprinklers will activate and spray effectively when needed during a fire.
4. They are meant to allow high velocity fluid flow but immediately stop reverse flow when the velocity drops.

A Fire Alarm Check Valve – Belongs To Fire Protection System

A Resilient Seated Flanged Ends Swing Check Valve is a type of check valve used in fire alarm systems. It serves a similar purpose as check valves for fire sprinkler systems – to prevent backflow and maintain system pressure.

1. Fire alarm check valves are installed in the water supply pipe leading to the fire alarm pressure tank.
2. They are designed to be durable and reliable enough to function for the lifetime of the fire alarm system, which may be 20-30 years.
3. Fire alarm check valves require approvals and listings from agencies like UL to certify they meet performance standards for use in fire alarm systems.
4. Spring-loaded clapper check valves are most commonly used as fire alarm check valves.

Fire Pump Check Valve – Fire Pump Systems Need It

A fire pump check valve serves an important role in fire pump systems by preventing reverse flow of water.

1. Fire pump check valves must be able to open and close rapidly to keep up with the high flow rates of fire pump systems. They are often larger and heavier duty than typical check valves.
2. Fire pump type check valve is as installed between the fire pump and the water supply (usually a water main or reservoir).
3. Swing-check valves and tilt-disc check valves are common styles used as fire pump check valves.

Oil Boiler Fire Check Valves – A Special Type Of Check Valve

An oil boiler fire check valve is a special type of check valve used in oil-fired boiler systems. It helps prevent fires from spreading by stopping the backflow of flammable oil.

1. Oil boiler fire check valves are designed to close quickly in response to a rise in temperature near the burner, indicating a potential fire.
2. They are installed on the fuel lines that supply oil from the storage tank to the burner of an oil-fired boiler.
3. They must be able to withstand high temperatures and the pressure spikes that occur when they slam shut during a fire event.

Fire Protection Wafer-type Check Valve – In Water-based Fire Sprinkler Systems

They are commonly installed in water-based fire sprinkler systems to prevent backflow into the water supply main. This helps maintain adequate pressure and flow for the sprinklers.

1. Wafer check valves installed on fire alarm system supply lines can prevent water from draining out of the pressure tank.
2. Wafer type check valves are sometimes used in fire hydrant drain lines to prevent water from draining out while also allowing discharge during hydrant use.
3. They can be installed in foam concentrate lines to prevent backflow into the foam tanks.

Fire Department Connection Check Valve

A fire department connection check valve serves an important purpose on fire department connections:

1. Fire department connections (FDCs) are where fire trucks connect hoses to replenish a building’s fire sprinkler system with water.
2. An FDC check valve prevents water from flowing back into fire truck hoses when they’re disconnected.
3. When fire trucks are connected to the FDC, the check valve allows high flow rates of water into the building’s fire sprinkler system.