How does a water pressure switch work?

Written by steve smith
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A pressure switch is used to "monitor" pressure in a well system. It will operate electrical controls or circuits that turn on and off depending on changes in the water pressure. To do this, the WPS (water pressure switch) has sensors that detect the water pressure. When it drops below a certain point, the switch turns the pump off, and vice versa. This is to protect the pump system and maintain a balance of pressure in the well system. The WPS typically shuts down the pump when pressure drops below 10 PSI (pounds per square inch).

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Where it is Located?

The WPS is located on the water tank. The pressure switch is used to maintain a safe water pressure in the tank, so normally it is located on the bottom. It has pipes that connect to the main inflow and outflow pipes of the well system. These pipes are part of the sensor unit that detects pressure. The WPS has a box in which the contacts are stored. It is also wired to the pump system so it can control its operation.

Other Considerations

There are several types of water pressure switches. They are generally referred to by their highest PSI rating, or the point at which the pressure becomes too high to operate the pump. These generally range from 40 to 60 PSI for home water wells. In addition to the diaphragm actuated sensors and cut off mechanism the pump also has what is called a pulsation plug. This is designed to prevent water surges from falsely turning the pump on and off. A well receives several of these surges, so without it the pump would constantly be turning on and off. This device can help prolong the life of the motor.

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