External reducing valves

[NW Mailing List]

Jimmy

      Thanks very much . I think I got most of it figured out today Buds answer was great info on  dates and when the Modifications took place  which was my main question. Then I got hung up on what physically changed from the original  Alco design.  What I came up with was they did away the original HP exhaust valve in the front of the saddle and removed the cast wall inside the saddle where it seated. Then did away with the unbalancing valve and made that partition the seat for the new exhaust valve which was on a common shaft with the intercepting valve now Positively controlled by the engineer in the cab. Then added the external reducing

Valve (HP steam to the LP receiver) which you can manipulate from the cab so called booster valve

 

Bud and ED and Dave does this sound correct

 

Thanks again

Larry Evans

 

From: NW-Mailing-List [mailto:nw-mailing-list-bounces at nwhs.org] On Behalf Of NW Mailing List
Sent: Monday, February 11, 2019 5:00 PM
To: NW Mailing List <nw-mailing-list at nwhs.org>
Subject: Re: External reducing valves

 

On 2/11/2019 2:17 PM, NW Mailing List wrote:

Larry,

If I remember the drawings correctly, the intercepting valve was moved outside along with the reducing valve. The saddle was then gutted. The reducing valve was not the problem. It didn't move.

It was the intercepting valve that did move and required lubrication that was the culprit. Maybe, this whole thing is a bit of a misnomer.

 

Jimmy Lisle

 

Larry,
    Now that I found my drawings, I see that I was wrong and the intercepting valve was left in the saddle and in a much simpler manner.

Before:



After:



Jimmy Lisle

 

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