Abstract: An emitter unit to be integrally bonded to an internal surface of a conduit and comprising an elongated housing, a housing inlet adapted to communicate with an interior of said conduit and a housing outlet adapted to communicate with a conduit outlet. An elongated, flow-restricting flowpath is formed in the housing having a flowpath inlet communicating with the housing inlet and a flowpath outlet communicating with the housing outlet. A resiliently flexible membrane is mounted in the housing which is of closed box-like shape and is constituted by an elongated receiving member and a correspondingly elongated cover member. Projections and recesses are formed along the lengths of elongated rim portions of the members and are directed substantially transversely to longitudinal axes of said members such that projections of one member are adapted to form a close pressure fit within corresponding recesses of the other member.

Abstract: An emitter unit to be integrally bonded to an internal surface of a conduit and comprising an elongated housing, a housing inlet adapted to communicate with an interior of said conduit and a housing outlet adapted to communicate with a conduit outlet. An elongated, flow-restricting flowpath is formed in the housing having a flowpath inlet communicating with the housing inlet and a flowpath outlet communicating with the housing outlet. A resiliently flexible membrane is mounted in the housing which is of closed box-like shape and is constituted by an elongated receiving member and a correspondingly elongated cover member. Projection and recess interengaging means are formed along the lengths of elongated rim portions of the members and are directed substantially transversely to longitudinal axes of said members such that projection means of one member are adapted to form a close pressure fit within corresponding recess means of the other member.

Abstract: An irrigation sprinkler having a tubular housing having an inlet and adapted to be coupled to a water supply source and an outlet and in which is located an outlet nozzle including a sprinkler outlet. The housing accommodates flow control means coupled at one end to said inlet end and having an outlet which communicates with and is spaced from the sprinkler outlet by a region defined within the housing and constituting an hydraulic quiet zone for ensuring that water flow arrives at the spray outlet with substantially symmetrical distribution and with minimal turbulence.

Abstract: A process and an installation for producing a drip irrigation conduit having discrete internally located emitter units bonded at axially spaced apart locations of an internal surface thereof, wherein the irrigation conduit is continuously extruded from an extrusion cross head at a first outer diameter and a first linear velocity and is drawn off through a calibrator unit to a second and lesser outer diameter at a second and greater linear velocity greater than the first linear velocity, the emitter units being continuously supplied on a carrier member which extends from within the extruder cross-head to the region of an inlet of the calibrator unit.

Abstract: An installation for the controlled dosing of an irrigation flow with a herbicide particularly for detecting root growth into the outlets of an underground drip irrigation line, includes a sealed container and a slow release herbicide material wherein a portion of the flow is directed through the herbicide impregnated material so that herbicide is controllably released into the diverted flow, and the diverted flow is reintroduced into the irrigation flow.

Abstract: An irrigation emitter unit is provided comprising an outer member of substantially cylindrical shape and having a tapering base portion with fluid flow coupling means; an inwardly directed peripherally flanged edge portion of the outer member; an inner member having a body portion of substantially cylindrical shape substantially sealingly fitted within the outer member and having a cover portion formed integrally therewith; a peripheral edge portion of the cover portion juxtaposed below the flanged edge portion of the outer member; an elongated groove formed in the cylindrical surface of the body portion; a cavity formed in the body portion and communicating at one end thereof with a fluid flow inlet; an inwardly directed flange formed integrally with the walls of the cavity; and a resiliently flexible membrane located within the unit.

Abstract: An emitter unit having an elongated flowduct. The flowduct comprises a central elongated control duct of substantially rectangular cross-sectional shape having a width a and two sets of successive like flow pockets located respectively on either side of the control duct and opening into the control duct. Each flow pocket of the sets is defined between a pair of adjacent side walls of a pair of successive baffles of a corresponding set of baffles. Each baffle has baffle side walls which terminate in a baffle edge of width c and of height b, the baffles of one set being respectively directed substantially towards the mid-points of the inter-baffle regions of the opposite set. The baffle edges of each set of baffles are substantially aligned and define one pair of opposite longitudinal sides of the control duct, the other pair of longitudinal sides of the control duct being defined by first and second opposite control duct walls.

Abstract: Apparatus for producing a drip irrigation conduit having discrete internally located emitter units bonded at axially spaced apart locations of an internal surface thereof, wherein the irrigation conduit is continuously extruded from an extrusion cross head at a first outer diameter and a first linear velocity and is drawn off through a calibrator unit to a second and lesser outer diameter at a second and greater linear velocity (greater than the first linear velocity), the emitter units being continuously supplied on a carrier member which extends from within the extruder cross-head to the region of an inlet of the calibrator unit.

Abstract: A process and an installation for producing a drip irrigation conduit having discrete internally located emitter units bonded at axially spaced apart locations of an internal surface thereof, wherein the irrigation conduit is continuously extruded from an extrusion cross head at a first outer diameter and a first linear velocity and is drawn off through a calibrator unit to a second and lesser outer diameter at a second and greater linear velocity greater than the first linear velocity, the emitter units being continuously supplied on a carrier member which extends from within the extruder cross-head to the region of an inlet of the calibrator unit.

Abstract: An irrigation emitter unit includes a fluid flow rate reducer having an inlet and an outlet. A wall portion of the unit has a recessed cavity formed therein which communicates with the outlet. The inlet is adapted to be placed in communication with an irrigation supply. An emitter unit outlet aperture is formed in the base of the cavity and a rim of the cavity has an area substantially greater than the area of a rim of the outlet aperture. A resiliently flexible membrane is juxtaposed with respect to the wall portion and is exposed to the irrigation supply so as to be pressed, during operation, sealingly against substantially the entire periphery of the cavity rim solely under the influence of fluid pressure and to define, with the cavity, an outlet control chamber.

Abstract: An irrigation emitter unit comprises an elongated body member having formed in a first surface thereof an elongated groove formed with a pair of oppositely directed flow resisting substantially triangular baffles, the groove having an inlet end and an outlet end, there being furthermore formed in the first surface a recessed cavity of elongated shape and being of extended dimensions as compared to the width of the groove, the outlet end of said groove communicating with the cavity so that the groove extends out of the cavity and is located on one side thereof, there being formed in the base of the cavity an outlet aperture extending to a second and opposite surface of the body member and having a rim area substantially less than that of the recessed cavity, a resiliently flexible membrane of substantially elongated shape juxtaposed with respect to the surface so as to be pressed sealingly thereagainst solely under the influence of fluid pressure and so as to define, with said groove, an elongated flow reducin

Abstract: In a water sprinkler device having a nozzle housing and an outlet aperture of said housing; a nozzle unit comprising, a resiliently flexible annular member, a resiliently flexible intermediate tubular portion and a nozzle outlet tube, the annular member merging continuously with the outlet tube via the intermediate tubular portion and defining with the outlet tube and the intermediate tubular portion a continuous bore, the outlet tube extending through the outlet aperture of the housing, the annular member being located within the housing so as to abut a rim of the outlet aperture.

Abstract: An irrigation system flushing valve comprising a housing, a coupling inlet of said housing for coupling to an end of an irrigation line, a flushing valve outlet of said housing, a valve seating formed in said housing communicating with said inlet and with said outlet, valve obturating means juxtaposed with respect to said seating and displaceable with respect thereto from a sealing position wherein said inlet is closed with respect to said outlet to an open position wherein said inlet communicates with said outlet; an extensible membrane mounted in said housing and defining with said obturating means a valve enclosure located within said housing and sealed with respect to said outlet by said obturating means and flow restricting means effecting flow communication between said inlet and said valve enclosure; the arrangement being such that the hydraulic pressures in said valve enclosure and said inlet respectively act on opposite surfaces of said obturating means and when the hydraulic pressure in said valve e

Abstract: An emitter unit comprises a housing having defined therein an inlet and an outlet, a substantially planar inner wall portion of the unit having defined therein a groove, a recessed cavity communicating with one end of the groove and being of extended dimensions as compared with the width of the groove, a second and opposite end of the groove communicating with the inlet, an outlet bore in a base portion of the cavity communicating with the outlet and having a rim area substantially less than that of the cavity and at least one subsidiary recess, a resiliently flexible membrane juxtaposed with respect to the inner wall portion with one face thereof defining with the groove a flow restricting flowpath, with the cavity an outlet control chamber, and with the or each recess, at least one retaining cell, coupling device for coupling the or each cell with reduced pressure zones; the arrangement being such that with the inlet coupled to a water supply the membrane is exposed to the supply pressure the membrane is di

Abstract: A fluid flow regulator unit comprising a hollow casing; means of defining inlet and outlet control chambers; flow connection means for flow connecting the inlet chamber to a fluid supply conduit; the casing having a surface containing an outlet aperture for flow connecting the outlet chamber to the exterior of the casing; fluid flow restricting means having an inlet and an outlet respectively connected to the inlet and outlet chambers; and a resilient flexible member responsive to the difference in fluid pressure between the inlet and outlet chambers for elastic deformation into cooperation with the aperture in the casing thereby establishing a flow restriction for fluid passing through the aperture whenever the pressure differential across the member exceeds a predetermined value.

Abstract: An in-line emitter unit comprising a tubular connector member having end portions adapted to connect together two successive lengths of irrigation conduit, a well structure formed integrally with an outer wall portion of the connector member, an inlet formed in said outer wall portion serving to effect communication between the interior of the tubular connector and the well structure, a cover member for the well structure, an elongated groove formed in an inner wall of the cover member, a recessed cavity formed in said inner wall and communicating with one end of the groove and being of extended dimensions as compared with the width of the groove, an outlet bore constituting a unit outlet and formed coaxially in a base portion of the cavity and having a rim area substantially less than that of the cavity, a resiliently flexible membrane located in the well structure and juxtaposed with respect to the inner wall so as to define with said groove a flow restricting flowpath, a second and opposite end of the groo

Abstract: A drip irrigation system comprising a thermoplastic conduit having substantially flat, discrete emitter units heat welded to axially spaced apart locations of an inner surface of the conduit adjacent outlet apertures formed in the conduit, the emitter units being preferably provided with an elastomeric membrane exposed to the throughflow pressure in the conduit for the purpose of stabilising the output rate of each emitter unit vis-a-vis possible flow pressure variations in the conduit.

Abstract: An installation for the controlled dosing of an irrigation flow with a herbicide particularly for detecting root growth into the outlets of an underground drip irrigation line, includes a sealed container and a slow release herbicide material wherein a portion of the flow is directed through the herbicide impregnated material so that herbicide is controllably released into the diverted flow, and the diverted flow is reintroduced into the irrigation flow.