10 LD 11 Valve removal

[sparkymike]

Is there a technique in removing these valves with the dimple such as a 10LD11
or 10F9 ? They seem to be very tight fit and I do not want to risk breakage.
Mike.

[G6Tanuki]

If the holder has a wire-spring round it to keep the holder's upstanding metal part clamped against the valve, you can usually wiggle this spring off to reduce the clamping.

Then put a broad-bladed screwdriver in the slot _above_ the dimple, and twist it so it expands the metal part away from the valve.

After that the valve should pull-out. *DON`T WIGGLE IT* - pull it directly and squarely up. If you wiggle it you risk cracking the pin-to-glass seals in the flat bottom of the valve-envelope.

[sparkymike]

Thanks for the tips. The valves that are in the set are upside down so I guess they did not want any dropping out. I have a box full of that type of valve in the loft somewhere. Will have to have a look to see if there are any matching those in the set.
Mike.

[Leon Crampin]

My technique is to apply thin penetrating fluid around the skirt, and then to simultaneously push through the spigot hole from below with a blunt wooden probe like a thin pencil, whilst pulling gently from above, with slight wiggling.

Leon.

[sparkymike]

Hi Leon, I was thinking along the same lines, but maybe a piece of hard plastic
around 3/8" square, to push on the dimple.
I managed to remove one valve but only after I had eased out the two metal wings. I reckon service engineers of the time must have had some sort of tool to enable quicker removal ? (unless these valves were ultra reliable.)
Mike.

[Herald1360]

Service engineers didn't. have to worry too much...... if the valve lost its vacuum on the way out, it was faulty and needed to be replaced. Small extra sale.....