Model 7145 Dual Solenoid
Adaptor Base

The purpose of the 7145 is to provide either two or three speeds for steering gear.  On a steering system having an autopilot, full power follow-up, both hydraulic and electronic, it becomes essential to have more than one rudder speed.  

The 7145 with closed centre spools can provide two or three speed operations and also an auto-fill line in the header tank.  By energizing one solenoid valve and setting the flow control for the appropriate speed, the rudder can be controlled by an full-power follow-up operation and by setting the flow control of the second solenoid, the rudder can be controlled at a slower speed by an autopilot.  

If both valves are open at the same time a third speed can be obtained, for jogging the rudder hardover to hardover.  If open centre spool valves are used, only two speeds can be obtained.  The oil will circulate through both valves at all times, but the maximum flow-through capacity will not exceed the needle-valve setting.

The maximum flow capacity with both valves fully open is 12 gallons per minute.  Volume compensated pumps are recommended.

When more than one spool value is used in a system, they should all be closed center. We recommend using soft shift solenoid values for a quieter and smoother system.