| 摘要 |
cAn automatic flow shift valve for use with swimming pool cleaning systems including a pool skimmer system for removing floating debris from the surface of the pool and an underwater pool cleaner system for removing debris from the floor of the pool, both of such systems operating through water suction by the periodic "on" and "off" cyclic operation of a suction pump. The valve is mounted over a flow orifice in a cover plate which is removably secured across the top of the well and removable debris basket of the skimmer and the underwater pool cleaner is connected by a hose to a second opening in the cover plate. The valve includes a central, fixed-position shift cylinder enclosing upper and lower spaced, but interconnected, pistons which are reciprocative within the shift cylinder. The upper piston is spring biased upwardly to open the valve when the pump is "off". The lower piston bears an orifice closure plate for closing off water flow through the skimmer and the flow orifice of the cover plate based upon water suction force on the closure plate during one cycle when the pump is "on", thereby causing suction operation of the underwater pool. A control cam located between the upper and lower pistons is operable to lock the pistons in an intermediate upper position within the shift cylinder to maintain the valve open during a second cycle when the pump is "on", thereby causing suction operation of the skimmer.
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