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We often see this piston type of air reducer onboard for control and service air. Main purpose is to reduce air bottle pressure of around 30 bar to control air, regulating it at 7 bar, or for service air 5 bar.
Maintenance normally is best done at Port if not at Sea by opening the sharing valve between the Control air line and Service air to prevent loss of control air. Control air is for Main engine Exhaust valve and pneumatic controls etc.
It important to understand the working before dismantling them as we will be seeing it often and working on it time to time.
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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