Maintenance manual
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6.
Steering gear electrical motor, pump and valve block
The SR and SV steering gears can be installed with either a conventional pump unit (PU) or a frequency
controlled pump (FCP) system.
6.1
Steering gear with frequency controlled pumps
The
frequency driven
steering gears have a compact design with two frequency controlled reversible
pump units, valve block and
electrical feedback units fitted to the steering gear.
The electrical motor for each pump unit starts when a rudder command signal is given and stops when
the rudder has reached the desired position. The power for operating control and steering systems are
both hydraulically and electrically separated and independent. The normal running condition is achieved
when one pump is running, when both pump units are running the steering gear will run twice as fast.
The pump units consist of four main parts which are; reversible pump, electrical motor, and bell house
with a flexible coupling inside.
The integrated valve block with filter units has fewer and less complex valves due to the reversible
pumps. The distributing valve housing is flanged to the housing of the Steering gear containing the non-
return valves (not illustrated), load control valves (1), solenoid operated isolating valves and coil (2),
relief valve (3), and return filter units.
Electrical motor
Flexible coupling
Reversible pump
Return filters
Valve block