Pneumatics Tools

How pressure switch operates?   


jauhar khan 
@jauhar123 | Posted 19 Sep. 2019


Air compressor pressure switches, like Switzer Pressure Switches, use air lines to monitor pressurized air as it moves to and from your air tank. All pressure switches have some element that reacts when pressure is applied to it. The most common device is a diaphragm that will physically compress when exposed to this air.

Air pressure in your compressor tank will increase and eventually build up enough backwards pressure to change the shape of this diaphragm. Deformation here will cause movement in the pressure switch.


When your air compressor pressure switch’s diaphragm is deformed enough, its movement will break contact inside the switch so that power stops flowing to the compressor’s motor circuit, stopping the compressor from further pressurizing the air in your tank.

Constant air pressure at a specific volume will keep the diaphragm deformed. When the air pressure in your tank drops far enough, the diaphragm will revert back to its normal shape. Once this pressure — called cut-in pressure — lightens to a certain level, an internal operator within the diaphragm will deform in an opposite manner. This movement closes the circuit and starts the motor back up again.