The pressure switch is an electro-mechanical device that monitors a fire sprinkler system for a rise or fall in water pressure after the alarm valve. In addition to the main components of the fire sprinkler system, there are a series of ancillary (support) components that regularly form part of an automatic fire sprinkler system. The motorised alarm bell or gong is a mechanical device, operated by the flow of water oscillating a hammer that strikes a gong, causing an audible alarm signal.
The purpose of the alarm valve is when opened to simulate the flow of water from a single automatic fire sprinkler. The alarm test valve is fitted between the sprinkler system side of the alarm valve and the drain. The alarm test valve is a small valve, normally secured in the closed position. The operation and subsequent water flow of an automatic fire sprinkler will lead to a drop in pressure within the fire sprinkler system after the alarm valve. It is essentially a valve that when exposed for a sufficient time to a temperature at or above the temperature rating of the heat sensitive element (glass bulb or fusible link) releases, allowing water to flow from only the affected sprinkler. The fire sprinkler head is also used to control the flow of water. When the pressure equalises or falls below the water supply pressure, the valve opens to enable water flow. The alarm valve should, (if routinely serviced), help maintain the water pressure within the automatic fire sprinkler system, helping to 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 Alarm Valve (also known as an 'alarm check valve') is used to control the flow of water into the fire sprinkler system. The water after the stop valve forms part of the installation. The water within an automatic fire sprinkler system can be divided into two parts Īnd This is the water being fed into an automatic fire sprinkler system from a water supply such as the town mains or a static water supply such as a tank, up to the Stop Valve That is used to monitor the state (open or closed) of the Stop Valve. Often the Stop Valve is also fitted with a Valve Monitoring Device (“Valve Monitor” The stop valve is used to isolate (stop) the water supply coming into the fire sprinkler system. It is often painted RED in colour with a large black circular handle, and is locked in the OPEN position, allowing the free flow of water.
The Stop Valve is used to isolate the water supply, it may also be called the isolating valve.
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