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A 1/8” thread pressure switch. This model type of pressure switches is quite common on domestic and commercial coffee equipment. This type of switch is used on Astoria CMA machines like the CK-CKE-CKX-CKXE. But also on the Wega Mininova

The thread used on this pressure switch is a 1/8” BSP-G. The pressure switch has a pressure reach of 0.5 up to 1.2 bar and has a pre-set of 1.0 bar. This model is rated for 15A at 250V

These pressure switches are adjustable. But don’t try to adjust them constantly, the mechanism inside the pressure switch isn’t made for that.

The principle of a spring actuated pressure switch is that when the boiler pressure raises, a membrane goes up and when it reaches the set pressure the contacts will disconnect. This results that there goes no power to the heating element anymore. When the pressure in the boiler lowers the contacts will connect again and the heating procedure starts over again.