Alarm check valve function

Why use alarm check valves in a sprinkler system? What pressure is needed to open a check valve? What are the parts of a check valve? How do I check PCV valve?

An alarm check valve can be activated (or opened) in one of two basic ways: either manually when a person activates a water gong, or electronically. Once the alarm check valves are activate they will allow water to flow through the system, engaging the sprinkler system as and where needed in order to suppress a potential fire. Alarm Valve is a double seated clapper check valve with grooved seat design, which ensures positive water flow for alarm operation and is designed for installation in wet pipe sprinkler system. External bypass prevents false alarm under all supply pressure condition.

The main purpose of the alarm check valve is to ring a mechanical bell called a water motor gong. The valve shoul (if properly maintained), help hold the system pressure steady and reduce the possibility of false alarms. This is accomplished by providing a one way ( check ) valve that is closed when the water pressure on the fire sprinkler side of the valve exceeds the water supply pressure.

The TYCO Model AV-1-3Alarm Check Valves are divided seat ring, rubber-faced clapper, waterflow alarm check valves that are intended for use in wet pipe (automatic sprinkler) fire protection systems. The Viking Model J-Alarm Check Valve serves as a check valve by trapping pressurized water above the clapper and preventing reverse flow from sprinkler piping. Alarm valve prevents a reverse flow of water or air pressure from the installation into the fire-pump room. In case a fire sprinkler is activated (opened) due to fire, the alarm valve will open and permit water flow into the system and a pressure switch gives a signal to activate the fire-pump. Protect your family and home.

After all, it is the place where you should feel safe and secure. When city sewer lines are filled to capacity, water from city sewer line tends to flow towards home sewer lines. Check valves functions here to stop this backflow of city sewer to home sewer lines. The alarm check valve is a water flow alarm device designed for vertical installation in the main supply to a wet pipe sprinkler system.

When a flow of water from the system equals or exceeds that of a single sprinkler, the valve is to actuate a fire alarm. Retarding Chamber is used with Alarm Valve Trim when variable pressure is anticipated in the system. It is a holding tank to prevent activation of the Sprinkler Alarm during water pressure surge, but permits the activation of alarm on sustained flow. They are used to turn off the water supply to the system.

Used in locations where the temps are not expected to go below 40F. Simplest type of fire sprinkler system and generally requires little maintenance. Water is under pressure at all times. This type of system is equipped usually with an alarm check valve.

Newer ones may not, instead having a backflow prevention check valve and an electronic flow. Retard chamber shall be a single cast iron body, one gallon capacity, and rated for a working pressure of 1psi. Retard Chamber shall be UL listed and FM approved and used with the Globe Model H Series Alarm Check Valves in systems have fluctuating water supplies, which could result in false alarms. A ball check valve is a check valve in which the closing member, the movable part to block the flow, is a ball.

In some ball check valves, the ball is spring-loaded to help keep it shut. For those designs without a spring, reverse flow is required to move the ball toward the seat and create a seal.