SAILTEC's Kobelt Hydraulische Steuerung Katalog - page 56

h y d r a u l i c s t e e r i n g a n d a c c e s s o r i e s
It is mandatory by some of the inspecting authorities to be
able to isolate steering components in case of failure and
maintain the items that are still functional. A series of ball
valves was normally employed to accomplish this task. In
cases of emergency, it was proven that the crew was not always
immediately aware of what to turn, and which way to turn it.
Kobelt Manufacturing, for this reason, provides a Steering
Mode Selector that consists of only two manual levers that
are either in the ON or OFF position. The unit is capable
of handling 26 gallons of oil per minute with two
small solenoid valves (13 gallons each). It is also
available, on special request, with a proportional
solenoid valve with a control circuit of 4 to 20 milliamps and
a flow capacity of up to 40 gallons per minute. Two sources of
hydraulic pressure can be fed into the 7149. Both supply lines
are equipped with check valves and flow controls. The system is
designed to control either two or four steering cylinders. Putting
the levers in the ON position will provide hydraulic pressure to
the output port. Cancelling a side (lever in the off position) will
stop the flow of oil to that half of the unit and, consequently, the
lines and the cylinders.
Unbalanced cylinders have an unequal volume and, therefore,
the oil needs to be able to circulate and excess oil has to
be returned to the tank. The 7149 will provide all of these
functions. In case of emergency, a manual hydraulic pump can
be connected to the ports provided on the 7149 that will allow
the ship to be controlled without any electricity of any kind. Of
course, the manual levers turning the unit OFF and ON also
require no electricity. Two safety valves can also be provided to
relieve any excess hydraulic pressure (in case the rudder hits a
solid object).
The unit is constructed entirely from bronze and stainless steel.
Maximum operating pressure is 2,000 PSI.
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