The 4204 is used for actuating hydraulic or mechanically actuated reverse reduction gear boxes. The 4204 are spring-centred, requiring only 2 control lines for engaging either forward or reverse clutch.
The 4204 is available in either a 2 direction position actuator at 10 to 80 PSI (.7 to 5.5 BAR), or a 3 position self-centering cylinder at 35 to 65 PSI (2.4 to 4.5 BAR).