Re: [AMC-List] combination valve

[Frank Swygert <farna@xxxxxxx>]

On November 11, 2006 Tom Jennings wrote:

> On Fri, 10 Nov 2006, Frank Swygert wrote:
> 
> > Wayne, the valve has to be centered. If it swings to one side it
will
> > block that side from receiving fluid, or at least cut it way down.
> 
> Really?
> 
> Its been a while since I've taken one apart, but I thought for
> sure it couldn't move that far. I've been wrong before though...

I think some models will at least partially block the flow. Probably
not enough ot affect braking though. I've looked at the cut-away
diagrams, haven't physically taken one apart. There were some changes
in the designs over the years, so one range of years might block flow
when tripped and some may not move over far enough. That's why I put in 
the "or at least cut it way down", but should have stated "at least
some years will at least partially obstruct the flow", or something
similar. I don't recall if it was early or late models that had the
valves that at least appeared to block the flow when tripped. More
likely late model disc brake valves. I know the old drum brake valves
won't block the flow. 

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