Which way round should I fit a circular, one-and-a-quarter inch diameter, ball valve diaphragm washer?
Forgive the many words, but I find these simple washers most difficult to describe.
The washer has a rim, and a solid centre portion. On one side, which I shall call side A, between the rim and the centre portion there is a raised up part; on the other side, side B, between the rim and the centre portion there is a depression.
If I hold the rim and push on the centre portion from side A, the rubber flexes and the centre portion moves in the direction of the push.
If I hold the rim and push from side B, the whole washer is almost rigid.
It seems to me that possibly the washer should be fitted so that the part of the arm that pushes on the centre portion should push onto side A, pushing the rubber onto the plastic nozzle through which water enters.
But today I have come across two valves where the washer had been fitted the opposite way round, hence my question, as I need to replace these two diaphragm washers.
Anode.