Abstract: An aerator for attachment to a water tap includes a labyrinth device having a plurality of labyrinth passageways leading from its inlet face to its outlet face for reducing the pressure of the water before fed to a water-air mixing chamber.

Abstract: A drip irrigation line includes a continuous tube having a plurality of flow-reducer elements each including a strip formed with an inlet chamber at one end having an inlet opening, an outlet chamber at the opposite end having an outlet opening, a flow-reducer path between the two chambers, and a connecting passageway between, and axially spaced from, the flow-reducer path and the outlet chamber. At least the portion of the strip forming the connecting passageway is of elastomeric material.

Abstract: A drip irrigation emitter includes an elastomeric member fixed within a housing and defining, with an internal surface thereof, at least a part of a flow-reducer passageway. The elastomeric member is embossed with an integrally formed relief formation on the surface thereof facing the internal surface of the housing to space it from the internal surface and to permit the enlargement or reduction of the flow-reducer passageway upon the deformation of the elastomeric member in response to the flow.

Abstract: A drip irrigation line includes a continuous tube having a plurality of openings along spaced intervals, and a plurality of flow reducers in the form of discrete elements bonded at spaced intervals to a continuous, elongated, flexible element of higher mechanical strength than that of the flow reducer elements, enhancing the strength of the tube.

Abstract: A moisture-responsive valve includes a water-swellable body within a housing adjacent a moisture-permeable wall thereof for controlling the movements of a valve member with respect to a valve seat in response to the moisture passing through the moisture-permeable wall. The valve member is floatingly mounted between a first spring interposed between the valve member and the housing and urging the valve member away from the valve seat, and a second spring interposed between the valve member and the water-swellable body and urging the valve member towards the valve seat.

Abstract: A rotary sprinkler comprises a nozzle outputting a jet axially thereof; a rotor rotatably mounted with respect to the nozzle in alignment with the axial jet and having a surface formation impinged by the axial jet to deflect the jet laterally of the nozzle and to rotate the rotor; and a retarding device having a first surface rotatable with the rotor with respect to the nozzle, a second surface non-rotatable with respect to the nozzle, and a viscous liquid between the first and second surfaces; characterized in that the first surface of the retarding device is a cavity formed in a surface of the rotor opposite to that having the surface formation impinged by the axial jet, and that the second surface of the retarding device is carried by a pin non-rotatably mounted with respect to the nozzle and disposed within the cavity.

Abstract: A rotary sprinkler includes a nozzle producing a jet axially of the nozzle, and a rotor configured to deflect the axial jet laterally of the nozzle. The rotor is formed with a socket receiving a pin, and a high viscosity fluid in the rotor socket is effective to apply a retarding force to the rotor during its rotation with respect to the pin.

Abstract: A water sprinkler, comprises a distributor head and a direction-reversing member movably mounted with respect to the distributor head. The latter member includes first and second surfaces impinged by the water jet in first and second positions of the direction-reversing member, a third surface contactable with the distributor head for rotating it in one direction when the first surface is impinged by the water jet, and a fourth surface contactable with the distributor head for rotating it in the opposite direction when the second surface is impinged by the water jet. The sprinkler further includes an abutment, and a pair of stops engageable by the abutment after the distributor head has been rotated a predetermined distance in the one or opposite direction, to switch the direction of rotation of the distributor head.

Abstract: A sprinkler comprises a nozzle and a distributor head mounted for both rotary and lateral movements with respect to the nozzle. The distributor head has two passageways formed such that when it receives the water jet in one or the other passageway, it directs the jet outwardly of the distributor head with the water applying a force tending to rotate the distributor head in one or the other direction. The sprinkler further includes an abutment, a first stop engageable by the abutment when the distributor head is rotated in the one direction by the flow of water through the first passageway to move the distributor head laterally of the nozzle to align its second passageway with the nozzle, and a second stop engageable by the abutment when the distributor head is rotated in the opposite direction by the flow of water through the second passageway to move the distributor head laterally of the nozzle to align its first passageway with the nozzle.

Abstract: A sprinkler comprises a nozzle head connectable to a source of pressurized water and including a nozzle bore through which the water issues in the form of a jet, and a rotary deflector having an underface formed with a radial array of grooves each having axially-extending inlet ends, radially-extending outlet ends, curved junctures joining the two ends, and curved bottom faces, which grooves are impinged by the water jet and deflect the jet laterally of the sprinkler while rotating the deflector. An adjustable mounting is provided for the rotary deflector enabling it to be mounted with its rotary axis at a plurality of different positions with respect to the axis of the nozzle bore, to vary the water distribution pattern produced by the rotary deflector laterally of the spinkler.