Seiwa SW AP01 - Manual (Page 40)

the unlikely event of the failure of the pump. This valve isolates the system into two
completely independent sources of steering power and, if required, can be supplied by
your Coursemaster agent.
Two-Line Steering Systems
Two-line systems are by far the most common and are manufactured by many
companies world-wide.
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The best known types include Flexatrol, Hydrive, Marol, Morse, Palm Beach, Seastar,
Seipem, Servis, Tenfjord, Teleflex, Vetus, Wills Ridley and Wagner.
Ram
Hydrive Helm Pum p
or sim ilar, with lock valve
Steer Pum p
Figure 3.14 Connection to a typical two-line system
Some two-line systems are supplied with a lock valve as part of the helm pump and no
additional lock valve needs to be purchased. But the lock valve is an option on, for
example, Hydrive and Vetus system. It must be used on Syten outboard systems. If a
lock valve is installed, it must be fitted as shown in Fig 3.14.
For information on other systems, including three-line and pressurised systems, please
consult the manufacturer’s data for those systems.
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