Abstract: A weir flap for use in a swimming pool skimmer opening is disclosed. The weir flap includes a buoyant body that is pivotally mounted at a lower end in the opening. The body includes a through slot having an inlet opening in a front face of the body and an outlet opening in either a rear face or an upper edge of the body.

Abstract: A regulating control valve used with automatic pool cleaners in swimming pools is disclosed. A cap serves as a closure for the opening in a relief chamber and has a relief port therethrough. On the underside of the cap and surrounding the port there is a hollow boss which serves as a valve seating against which a relief valve within the chamber seals. There is a bleed opening between the cap and the relief valve which is permanently connected to the main water passage. The bleed passage is formed either by an eccentric enlargement to the port or by a cut out in the boss.

Abstract: A closure device covers the inlet portal of a swimming pool weir. The closure device has a main opening that is controlled by a weir flap and a secondary opening to accommodate flexible piping leading to a pool cleaner, whereby water can be drawn into the weir simultaneously both through the flexible piping and the main opening. The weir flap has an elongated slot just below the upper edge.

Abstract: A control valve for use in a swimming pool containing an automatic pool cleaner is described. The valve comprises a main water passage having an inlet port in a cranked inlet portion and an outlet port. A valve chamber extends from the main passage. It has a relief valve and an outlet through its side wall. A by-pass passage connects the outlet to the main water passage. A valve member sensitive to the pressure in the by-pass passage is located within the chamber and is biassed by a spring into a closed position to close off the relief port. When the pressure in the by pass passage falls, the valve member is drawn into the open position in which it controls the opening of both the relief valve and the outlet in dependence upon its position.