Thanks Dennis. That makes perfect sense.

John
On Jan 15, 2016 21:25, "Dennis Haynes" <d23haynes57@hotmail.com> wrote:

> The function of the restrictor for noise reduction is a bit complicated.
> It is not just the pump that causes a noisy system. Power steering
> hydraulics are a bit complicated. The pump also has a flow/pressure control
> mechanism but the real magic is in the rack itself, in particular the
> rotating valve assembly as part of the pinion gear input. When things are
> at rest there is little pressure and the fluid just flows through that
> valve setup. When you turn the wheel the shaft actually twists  and the
> valve directs fluid to one side of the piston in the rack. Turn the other
> way and pressurized fluid pushes on the opposite side of the piston. Flow
> control and back pressure is used to prevent the system from over reacting
> and turning the wheel faster than you want. That restrictor helps to dampen
> the interaction of those valves both for noise and smooth comfortable
> operation.
>
> Dennis
>
>
>
> -----Original Message-----
> From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf
> Of John Rodgers
> Sent: Friday, January 15, 2016 9:43 AM
> To: vanagon@GERRY.VANAGON.COM
> Subject: Power steering
>
> Can anyone explain to me what the restrictor in the high pressure hose
> from hydraulic pump to metal line does, and how it works to do its job?
>
> Looking for enlightenment!
>
> John
>