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Pressure Control Switch Water Flow Control

The purpose of a pressure control switch is to detect changes in the pressure within a water system. The changes in the pressure cause parts within the switch to move, triggering an electrical circuit that turns on/off a pump or other component.Typically, a switch will operate automatically until damaged or degraded. It will then only act when it senses a significant change in pressure.
There are several different types of pressure switches, including the mechanical ones that use a diaphragm to press against a piston and spring in the switch. When the pressure rises to a certain set point, the diaphragm eases on the piston and spring, activating the switch and sending an electrical signal to turn on the pump.
Some of these switches can also be used as water flow controls for dry-pipe, preaction, and deluge fire sprinkler systems that surge a lot of pressure during the first few seconds of a fire. When that pressure builds too high, the switch shuts off the water to help prevent damage from the extra pressure or from opening the clapper valve in wet-pipe sprinkler systems.
A sprinkler flow switch is most often found in automatic fire sprinkler systems and serves as a simple way of detecting when the flow of water through the pipes exceeds a specific flow rate, allowing it to trigger a time delay that will send a warning signal to a fire alarm control panel or call the fire department. Most of these switches feature a delay timer to avoid false detections caused by other changes in pressure that are unrelated to the flow sensor.

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