[modeleng] Re: Balls - what sort do you have and how do you seat them comfortably?

As a personal thing, I would go for Stainless balls, lapped in. I use Brasso
to lap in using your method of a ball soldered onto a rod. Worked on my
locos.

Dave.

----- Original Message -----
From: "Peter Sheppard" <peter.sheppard@xxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Monday, September 27, 2004 12:22 PM
Subject: [modeleng] Balls - what sort do you have and how do you seat them
comfortably?


> No it's not a porn site!
>
>
> I have recently been running the Hunslet on air (albeit briefly as even
> with a 50 litre tank it gets through the air at a phenomenal rate!)
>
> One thing I have noticed is that one of the safety valves starts to weep
at
> around 30 psi, the other has a far sharper opening at 90psi (the loco is
90
> psi working pressure).
>
> I have inspected the safety valve and it is a "standard" bronze ball on a
> flat seat arrangement (with a spring to give the pressure on the seat.)
It
> is not a Ross Pop type, but a simple "standard" safety valve.
>
> Obviously I would like it to seat better, so I have a number of questions
> for the esteemed membership of the list!
>
> 1. What is better - bronze or stainless balls
> 2. Should I reseat by the traditional method of stainless steel ball, a
rod
> and a sharp tap; or
> 3. Should I lap a ball into the seat (I silver solder a ball to the end of
> a piece of rod and "burnish the seat) - I don't usually use any form of
> paste, just pressure.
>
> The seat is about 50mm down in the depths of the safety valve, the only
> access is from the top (you can't separate the seat from the chamber).
>
> Any thoughts, any personal preferences?
>
> Cheers
>
> Peter
>
> MODEL ENGINEERING DISCUSSION LIST.
>
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>


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