The SVW1BA1 is a 3 position lever valve that will spring to back to center. Examples of use are: Squaring Arm control, Log Taper, and Log Lift.
The SVW1BA9 valves are used when a joystick is needed. The joystick control takes the place of 2 lever valves. One joystick can raise and lower the log clamps and slide them back and forth where ths would normally take two lever valves to do the same action. Examples of use are: Log Clamps and Log Turner.