Next message: Aharon: "RE: lv-ab: Spoiled Rotten"
on 8/31/01 12.03, at wrote:
> In a message dated 08/30/2001 5:36:49 PM Atlantic Daylight Time,
> writes:
>
>> Are you referring to feedback or follow-up?
>
> The Wagner steering system consists of:
>
> A bi-directional pump. There are two pipe connections that have pipes
> attached that go the steering ram through the function valve. The steering
> wheel is on the pump's shaft. Hydraulic oil fills the pump case.
>
> The function valve. This valve has the two pipes from the pump, and two
> pipes that go to the steering ram.
>
> The ram. The steering ram's rod goes all the way through so as the piston
> moves the same amount of fluid that goes in one side comes out the other.
>
> When you turn the wheel in one direction the fluid moves in one direction,
> when you turn the wheel in the other direction the fluid goes the other way.
>
> The valve selects feedback, non-feedback or free. In feedback it does
> nothing. That is, if the rudder is pushed hard enough the wheel turns. In
> non-feedback, no matter how hard the rudder is pushed the wheel does not
> turn. In free, the rudder can be turned by an emergency tiller without
> turning the wheel.
>
> Any questions?
>
> Norm
I would love to know the details of that valve. It is more than a check
valve. In non-feedback it has to allow oil flow only when the pump (wheel)
is turning, and, since this is a closed system, it has to allow
BIDIRECTIONAL flow ONLY when the wheel is moving.
Free mode is easy enough to understand<g>. Directs flow from one side of
rudder to the other, and one side of the wheel (pump) to the other, unless
it locks the wheel.
--
Karl Jenkinson
S/V Gay Deceiver, Searunner 37+2+2
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