Anti-backflow water control and solution proportioner

摘要: A plurality of ventable chambers in tandem with a valve between them and disposed source pressurized municipal water flow-control solution-proportioning device. The have movable walls that close vents open backflow check valves under conventional pressures, then the while positive gauge pressure still exists supply but which has dropped to predetermined low or inadequate operate proportioning device successfully. Resilient means are provided control wall movements venting predetermine desired differential across at respective openings closings will occur.