Bosch SB7 auxiliary control unit (AK Regeltechnik)

New double-acting replacement control valves for the Bosch SB7 system are offered here.

They fit various tractor makes and models.

This is a 5/4-way valve, like the original Bosch valves. It has the positions lift, neutral, lower and float.
The control valve can be switched between single-acting and double-acting operation using a grub screw on the back.
The control valve has a hydraulic end-stop on port A. This means that when the maximum pressure is reached, the valve unlocks and automatically returns to the neutral position. This matches the function of the original SB7 control valves.

The lift (A) position is detented.

The lower (B) position is detented. Moving past the lower position switches on the detented float position (consumer ports A and B are connected to each other and to the return). The float position can also be used as a detented lower position with both double-acting and single-acting lift cylinders.

The control valve is easily integrated into the existing system using longer studs.
The control valve has work ports at the bottom (as on the original) and at the top. The top ports make it suitable for installation where clearance to the steering knuckle is limited.

It fits various tractor makes (list may be incomplete):
IHC; Deutz; Fendt; Eicher; Schlüter; MB Trac; Güldner; Kramer; Lindner; Steyr; Porsche;

Technical data:
Max. operating pressure [bar]: 250
Max. return pressure [bar]: 50
Nominal flow rate [l/min]: 60
Tightening torque [Nm]: 30
Overlap: positive
Ports [mm]: M18 x 1,5