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| | For larger boats supplier, 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 0 360 mm will usually suffice. | |
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| | VETUS hydraulic power steering is also extremely safe. Should there be a power assistance failure, then the steering system will still operate unassisted, only with somewhat greater effort. The pump unit is in fact a rotating proportional valve. By turning the wheel, this 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. | |
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| | SCHEMATIC BASED ON "LOAD SENSING" PUMP | |
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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. | | 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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| | VETUS power steering can be connected to an existing on board for boat hydraulic system. However, if one is not fitted and only power steering is required, this small hydraulic tank (contents about 20 litres) will be required. The tank comes complete with all the necessary control components mounted on the top. Dimensions of the tank (l x w x h): 460 x 300 x 470 mm. | Although the engine manufacturer will often supply the hydraulic pump, VETUS can also offer a fixed volume hydraulic pump, which is belt driven off the main engine. This VETUS pump has a built in bearing block. Its dimensions are small and are comparable with those of the alternator. The pump has a power take-off of approximately 1 kW (1.5 hp). Dimensions ( l x w x h ): 220 x 90 x 112 mm. Weight: 5kg. Shaft diameter: 22 mm Maximum shaft speed: 3,500 rpm If an existing engine driven pump is to be used, the hydraulic flow rate must be minimum 7 l/min and maximum 40 l/min, with a maximum working pressure of 70 bar. | OIL COOLER If a pump with a fixed swept volume, or a high capacity is installed, or if the ambient temperature is high, a lot of heat can be generated. In these cases, the installation of an oil cooler in the return line will be required. Three different cooling water hose diameters are available: 0 32 (HT301132), 0 42 (HT301142) or 0 47 (HT301147). | |
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| | | | | | | | | | | | Pump type Assuming 4 - 6 steering wheel revolutions from port to starboard | | | Oil flow to steering pump litre/min. | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The size of the cylinder is determined according to the size of the rudder or better still: according to the rudder torque. (How to calculate this rudder torque is shown on p. 47) See p. 45 and 46 for hydraulic cylinders. | |
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| | IT GOES WITHOUT SAYING THAT VETUS WILL BE PLEASED TO OFFER TECHNICAL ADVICE AND TO PROVIDE THE REQUIRED INSTALLATION INSTRUCTIONS AND DIAGRAMS 30 www.vetus.com | |
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| | 030031_09.indd 1 Edge's 04-08-2008 14:39:38 | |
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