Multiple flow valve control for liquid treatment apparatus

摘要

A water softening treatment tank 11 has a flow control valve housing 10. Raw water is supplied to the inlet port 21 and flows through chambers 15 and 17, port 24 into the tank 11 through bed 12, conduit 46, collector 44, chamber 26, valve 38 and out to service lines through port 22. Regeneration is initiated by opening, automatically if necessary, valve 31 (Fig. 3) which reduces pressure in tank 11. The closure member 20 is forced downwards from seat 18 on to seat 19. Water now flows through port 29 to brine supply, Fig. 4, regenerant liquid flowing through port 27 and conduit 46, distributer 44, through bed 12, distributer 43, chamber 17, drain valve 31 to outlet conduit 30. A predetermined quantity of regenerant is drawn under control of float valve 49 and is followed by flushing water. A flow control to initiate back-washing is described in relation to Fig. 2 (not shown). The apparatus may be automatically returned to treatment by closing valves 31 and 37 (not shown).