Abstract: This invention provides a valve by means of which a major portion of the suction flow of a swimming pool filtration system is channeled through an automatic cleaning device which cleans the floor and/or wall of a swimming pool, and a minor portion of the suction flow is drawn from the surface of the pool thereby to skim the surface. The valve has a main inlet opening connectable to the device, an outlet opening connectable to the filtration system and an auxiliary opening which is closed to some extent by a closure member to normally provide a restricted aperture through which the water drawn from the surface flows. The closure member is biassed closed by a spring located in a variable volume chamber which communicates with the interior of the valve between the auxiliary opening and the main inlet opening. When the restricted aperture is blocked by leaves or the like, the pressure in the chamber decreases, compressing the spring and allowing the closure member to open.

Abstract: This invention provides a valve by means of which a major portion of the suction flow of a swimming pool filtration system is channeled through an automatic cleaning device which cleans the floor and/or wall of a swimming pool, and a minor portion of the suction flow is drawn from the surface of the pool thereby to skim the surface. The valve has a main inlet opening connectable to the device, an outlet opening connectable to the filtration system and an auxiliary opening which is closed to some extent by a closure member to normally provide a restricted aperture through which the water drawn from the surface flows. The closure member is biassed closed by a spring located in a variable volume chamber which communicates with the interior of the valve between the auxiliary opening and the main inlet opening. When the restricted aperture is blocked by leaves or the like, the pressure in the chamber decreases, compressing the spring and allowing the closure member to open.

Abstract: This invention provides a valve by means of which a major portion of the suction flow of a swimming pool filtration system is channeled through an automatic cleaning device which cleans the floor and/or wall of a swimming pool, and a minor portion of the suction flow is drawn from the surface of the pool thereby to skim the surface. The valve has a main inlet opening connectable to the device, an outlet opening connectable to the filtration system and an auxiliary opening which is closed to some extent by a closure member to normally provide a restricted aperture through which the water drawn from the surface flows. The closure member is biassed closed by a spring located in a variable volume chamber which communicates with the interior of the valve between the auxiliary opening and the main inlet opening. When the restricted aperture is blocked by leaves or the like, the pressure in the chamber decreases, compressing the spring and allowing the closure member to open.

Abstract: This invention provides improvements to apparatus for automatically cleaning surfaces submerged in a liquid. Thus, there is provided an apparatus having a pivotally displaceable float by means of which the apparatus is caused to turn around when migrating up an upright surface so as not to break the surface of the liquid. The pivotal axis of the float is further tiltable, a tilting float being provided to tilt the pivotal axis to assist in displacing the float. The apparatus further has a sealing flange which has perimetral concertina-like folds so as to be resiliently extensible. Still further, the apparatus has a cleaning head, the region thereof that engages the surface to be cleaned having zones with differing frictional characteristics to cater for various surfaces. In a preferred embodiment this is effected by providing sockets in the cleaning head in which studs having the required frictional characteristics are secured.

Abstract: This invention provides improvements to apparatus for automatically cleaning surfaces submerged in a liquid. Thus, there is provided an apparatus having a pivotally displaceable float by means of which the apparatus is caused to turn around when migrating up an upright surface so as not to break the surface of the liquid. The pivotal axis of the float is further tiltable, a tilting float being provided to tilt the pivotal axis to assist in displacing the float. The apparatus further has a sealing flange which has perimetral concertina-like folds so as to be resiliently extensible. Still further, the apparatus has a cleaning head, the region thereof that engages the surface to be cleaned having zones with differing frictional characteristics to cater for various surfaces. In a preferred embodiment this is effected by providing sockets in the cleaning head in which studs having the required frictional characteristics are secured.