"Adam" wrote in message ...
I'm going to use hydraulic steering system in my project.
I'm wonder what is different between expensive pump and cylinders by
Teleflex SeaStar, in example and regular not expensive commercial parts.

I've never really seen a "commercial" rotary type helm pump! You need a
check valve arrangement to prevent the rudder from moving the steering wheel
in strong seas.

However, cylinders used on steering systems are of the balanced type (there
is a rod on both side of the cylinder). This is so the volume of fluid is
the same when turning either direction. Most commercial cylinders are
unbalanced type.

Are you sure the materials are the same - most marine hydraulic cylinders
are bronze or aluminum in the smaller sizes, with stainless rods. Typical
commercial cylinders are painted steel, with chromed steel rods.

Parameters are very close, material is the same, only cylinder ends are
different.
So the question is - what is different? can be used?
Thanks in advance
Adam
S/V SeaGoat


--
Evan Gatehouse

you'll have to rewrite my email address to get to me
ceilydh AT 3web dot net
(fools the spammers)