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Not a plumber here, with a question about valves and pressure. We have a large commercial job on a hill. Domestic pressure is not awesome, about 35 on the city side and drops approx 10 psi across the check valve. Manufacturer says max pressure drop should be <1 psi. The installer says they put it on correctly and it was still working after they came out to repair a leak. (pressure drop started right around this time coincidentally)

I was hoping to get some opinions on what might cause this drop. We have a meeting with the installer and manufacturers rep next week and I want to be ready to speak intelligently about it. Especially since the next step is a $$ pump.
 
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