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At Rebreathe, we develop highly intricate 4-way Solenoid Valves. Each end has one solenoid coil, allowing for activation in two separate directions inside an oxygen concentrator. All ports are shut in the middle position, resulting in a “locked” control state for the pneumatic actuating element fed air by this solenoid valve. These valves make it simple to reverse the motion of a cylinder or motor by providing four independent flow pathways.