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If found faulty, some may want to replaced as a whole provided there is a spare.
If not if taking out for cleaning for routine maintenance, cleaning the piston(25), check the condition of the gasket on the valve disk(10).
Make a marking on the body before dismantling, as the center body consists of 2 different holes passage, 1 from inlet to the pilot valve and, 2nd from outlet to the diaphragm.
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