When the water pressure drops to a certain level, the switch senses more water is needed, and spring-loaded electrical parts make contact, turning on the well pump.

Ensure max electric fuel pump output and safety with a relay for no voltage drop, plus an oil pressure switch that won’t let the pump run if the engine loses oil pressure.

Would it be smart to buy a pump with a pressure regulator so I can set the desired pressure? (Sometimes it’s best not to fiddle with settings.) Are there self-regulating pumps?

Brian Gettemeier explains how the use of the preset button on the pump panel saves time and water on the fireground.

The cut-in value of the low-pressure switch is generally set to a saturation pressure equivalent to the minimum expected ambient temperature. One manufacturer recommends a low-pressure switch setting ...