For metering pumps what are the reasons to use double check valves?
Taking clue from your mention of the double check valve, I browsed the net ‘serach’ing for “DOUBLE CHECK VALVE” and got the following description of a dual check valve. “Dual Check Valve Baackflow Preventer is designed to prevent cross-connections of non-potable water (non-hazardous) into the safe drinking water systems. It is a compact and economical device that is easily installed, serviced and repaired in the line. The device consists of two independently acting, spring-loaded check valves in a corrosion resistant material.” From this it seems that one uses a dual or double check valve, when there would be apprehension of unwarranted mixing of non-compatible products. I would hence guess that one would not need a dual check valve, if there is no such apprehension. Design of Submersible Motor-Thrust bearings I have tech question regarding the thrust and sleeve bearings of the deep well submersible motor, some 6 year or before every European and US made motor had bronze based thrust b
