Page 212 - Vetus

HYDRAULIC POWER STEERING

For larger boats, VETUS hydraulic power steering is a most comfortable and extremely safe steering system. The effort required at
the helm is only about 10% of a non-powered steering system. In other words: the boat can be steered literally with one finger.
Because of this, the steering wheel diameter can be considerably smaller than normal; a wheel diameter of just 14 /64” (360 mm)
11
will usually suffice.

HT1018 VETUS hydraulic power steering is extremely safe.
Should there be a power assistance failure, then the
steering system will still operate unassisted, only with
HT1020 somewhat greater effort. The pump unit is in fact a
rotating proportional valve. By turning the wheel, this
HT1025 control valve opens and directs oil under pressure to the
steering cylinder connected to the rudder. The volume
of hydraulic fluid that is circulated, is dependent on
the model of steering pump, the number of wheel
revolutions and the speed at which the wheel is turned.
The VETUS steering pump has a closed mid position,
ensuring that there will be no oil flow as long as the
wheel remains untouched. To connect one or more
VETUS steering pumps and/or an automatic pilot to a
VETUS hydraulic system, a control unit model HT 1019
must be used.

The external flange of the steering pump is made of seawater resistant aluminium, hand polished and anodised. The steering wheel
shaft is made of stainless steel, type I-4462, Ø /4” (19 mm), taper 1:12.
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The VETUS hydraulic power steering has been developed for application within the “VETUS Power Hydraulics” programme, which is
based on the “constant pressure” (load sensing) principle. If your boat is equipped with a hydraulic system which does not operate
on this principle, VETUS will gladly advise on how to adapt your system, in order to enable installation of this type of steering.

Type Specifications HT1019
HT1020 Hydraulic power steering 4.6 in³/rev for cylinders up to MTC175 Solenoid control unit (24 Volt) for use with
HT1018 Hydraulic power steering 5.8 in³/rev for cylinders up to MT230 a hydraulically powered steering system or
an automatic pilot.
HT1025 Hydraulic power steering 8.8 in³/rev for cylinders up to MT345
HT1019 Steering and control unit for hydraulic power steering and autopilot
HT1021 Dual non-return valve for hydraulic power steering
HT1019

Schematic based on Fixed Pump

1. Steering pump with non-return valve
2. Steering pump with non-return valve (second steering position)
3. Control unit
4. Propulsion engine
5. Hydraulic pump
6. Filter
7. Hydraulic tank
8. Oil cooler
9. Shuttle valve
10. Non-return valve
11. Priority valve
12. Cylinder with by-pass

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