My system pressure won’t regulate and goes high under low flows, what should I check ?
A. Under normal conditions, certain types of systems should be expected to have a pressure rise under low or no flow conditions. Typically such rises should be 5-10psi. If the pressure goes even higher, then the control piloting on the PRV (pressure regulating valve), or the valve itself may be at fault. (First confirm that all air has been bled from the valve cover) Disassembly and cleaning of the piloting may be necessary to accurately determine the cause. Further, the valve cover may need to be removed for inspection of the diaphragm, stem, stem guide bushings, seat and seat seal. It is recommended that a valve repair kit for the specific size and brand of valve involved be on hand prior to disassembling the control valve. A troubleshooting guide is usually found inside your system owners manual or can be faxed or mailed to you upon request..
