... ) 6-1 '/ 21, the control valve comprehensive performance(1) BLUEWATER control valves economical efficiencyOne product promotion needs ... different models accord to different ground water different control valve provides various choosable accessories, try to contain ... control valves (6600, 6800, 7800, 8600, 8,800) are optional as hot water system (temperature ≤65 °C, 150 ° F). Part time model valve ...