Comparison of the old and new diaphragms. It
is clear to see how badly perished the existing diaphragm was and indeed
it had a couple of holes in it which will have reduced the pressure
differential either side of the disc resulting in a partial failure of
the
valve function. The shaft of the new diaphragm required lubricating with
silicone grease before refitting and care should be taken to
balance/centre the diaphragm on the shaft to ensure it is held centrally in the valve body.
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