... pressure protection of some refrigeration systems, residential, commercial system. The pressure control is used for the high and low pressure ... It can also be used to pneumatic andhydraulic pressure control systems of all kinds of industrial and agriculturalmachines.Type ... extra-high (800 ~ 2,200PSI), high (145 ~ 700PSI), low (3 ~ 145PSI), vacuum (-7.4 ~ 0PSI)3. Electrical control method: SPST (two ...