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ULTRAFLEX
1 PRODUCT DESCRIPTION
1.1 Hydraulic steering system operation
All ULTRAFLEX hydraulic steering systems are designed in conformity with UNI-EN-ISO 10592 and A.B.Y.C. P21
regulations. All ULTRAFLEX steering systems can operate at temperatures between -18°C (0°F) and +77°C (+170°F).
All the components are made for the marine environment, using materials and working processes which offer
long life and safety under the most extreme conditions. A hydraulic steering system consists of a steering pump, a
cylinder tied to the rudder or to the outboard or sterndrive engine and the
connecting hoses (see picture). Under normal operating conditions, a turn
of the steering wheel will pump the oil, which flows in through the hoses to
the cylinder, according to the turn direction. With the consequent cylinder
movement the oil will flow to the pump through the hoses and at the same
time moves the engine or the helm which are connected to the cylinder.
The pumps UP25 F-SVS, UP28 F-SVS, UP33 F-SVS, UP39 F-SVS, UP25 T-
SVS, UP28 T-SVS, UP33 T-SVS and UP39 T-SVS are equipped with a
pressure relief valve, which prevents outgoing fluid from returning along
the same hose. It also allows the operation of the steering systems with
two or more steering stations. The unbalanced cylinders cannot be used
with the pumps UP25 F-SVS, UP28 F-SVS, UP33 F-SVS, UP39 F-SVS, UP25
T-SVS, UP28 T-SVS, UP33 T-SVS and UP39 T-SVS. A well balanced steering
system needs a correct choice of the pump for the cylinder. ULTRAFLEX
produces different pump models, which have different capacity (cm
each type of installation. While choosing the pump it is important to consider the cylinder volume. The number of
starboard and port turns is determined by the ratio between the cylinder volume and the pump capacity. The
release pressure of the pressure relief valves is of 10,3MPa (105 bar) (1500 PSI).
Example: if the pump has a capacity of 28 cm
formula looks like this: 120/28=4,2. Accordingly, the steering wheel will turn about 4 times before the cylinder will
completely turn from one side to the other. In case of installations with double cylinders connected in parallel the
cylinder volume must be added. Applications with less than 4 turns are not recommended, as they need a higher
effort, also applications with more than 8 turns are not recommended, as the response of the boat to steer is slowly.
1.2 Warnings for the correct product use
DANGER
Do not modify the steering cylinder in any way to fit it to your application, otherwise the cylinder will no
longer operate in safety and it will endanger the boat and the occupants.
WARNING
All ULTRAFLEX steering systems must not be installed on boats equipped with engines whose maximum
horsepower is higher than the horsepower rating approved by boat manufacturer.
WARNING
ULTRAFLEX steering systems must not be installed on race boats.
WARNING
The pumps UP25 F-SVS, UP28 F-SVS, UP33 F-SVS, UP39 F-SVS, UP25 T-SVS, UP28 T-SVS, UP33 T-SVS and UP39
T-SVS cannot be used with unbalanced cylinders.
1.3 System configurations
WARNING
The pumps UP25 F-SVS, UP28 F-SVS, UP33 F-SVS, UP39 F-SVS, UP25 T-SVS, UP28 T-SVS, UP33 T-SVS and UP39
T-SVS can only be used with SVS hydraulic cylinders and hoses (outboard cylinder UC128-SVS and Kit OB-SVS)
CAUTION
Always connect the hoses correctly as indicated in the installation and maintenance manuals of the
corresponding hydraulic cylinders.
of oil moved each steering wheel turn) and for
3
[1,7cu.in.] and the cylinder has a volume of 120 cm
3
PUMP FOR HYDRAULIC SYSTEMS
Installation and Maintenance Manual
pump
engine
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page 7
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cylinder
hydraulic hoses
[7,3cu.in.], the
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