you may need to clean your filter screen from your water reservoir tank. i have some valves with the same diaphragms in them from when i bought them years ago. i seem to notice dripping if the system has "low pressure" i realize this is a low pressure system but if i notice dripping on several valves i have taken the filter screen out and scrubbed it real good with a toothbrush and solved the prob. i also will loosen the valves two housing pieces, allow it to "flush itself" for a few seconds and then tighten it back up (snug not too tight) this will also fix a drip in some cases. john yocum

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