Abstract: There is provided a proportioner for the internal admixture, at a constant proportioning ratio, of an inflowing liquid additive to a liquid carrier, the proportioner including a first flow-attenuating means, and a second flow-attenuating means, wherein the first and second flow-attenuating means are mechanically coupled and biased by biasing means against the carrier inflow.

Abstract: There is provided a proportioner for the internal admixture, at a constant proportioning ratio, of an inflowing liquid additive to a liquid carrier, the proportioner including a first flow-attenuating means, and a second flow-attenuating means, wherein the first and second flow-attenuating means are mechanically coupled and biased by biasing means against the carrier inflow.

Abstract: The invention provides a pressure regulator, including a housing having a bottom and provided with an inlet tube having a control rim and connectable to a pipeline under mains pressure, and at least one outlet tube connectable to a consumer; a diaphragm made of an elastomer, located within the housing and retained therein by retaining means; a control rod effectively coupled to the diaphragm and passing through the inlet tube, the rod having a control head at its free end, which head, in the assembled state of the regulator, is located in proximity to, but beyond, the control rim; wherein the bottom of the housing and the bottom-facing surface of the diaphragm define a single chamber serving both as inlet and outlet chamber, and wherein increased pressure in the single chamber causes the diaphragm to bulge away from the bottom, causing the control head to approach the control rim of the inlet tube and increasing the pressure drop in the single chamber, and wherein reduced pressure in the chamber enables the e

Abstract: There is provided a liquid flow regulator, having a split housing (2) including an upper portion (4) connectable to a source of liquid to be dispensed, the upper portion having an inlet port (10) and a lower portion engaging the upper portion and having a control output port leading to the consumer of the liquid, an elastically deformable diaphragm (32) disposed in the housing (2) and defining with a bottom surface of the upper housing portion a first chamber (34), and with a bottom surface of the lower housing portion in which the output control port (24) is made, an output control chamber (36), and a tubular flow attenuator (42) disposed in the housing (2), forming a liquid flow path between the first chamber (34) and the control chamber (36), characterized in that the thickness of the diaphragm (32) is at least equal to the distance between the diaphragm (32) in its state of rest and the output control port (24).

Abstract: The invention provides a self-cleaning inlet head for a fluid, operable in a first, draining, mode and in a second, backflushing, mode, including a body having a front end and a rear end; a piston slidably mounted in the body and having having a front face and a rear face; a first space extending between the rear end of the body and the rear face of the piston and a second space extending between the front face of the piston and the front end of the body; a bore connecting the first space and the second space; a valve mounted in the first space for closing off the bore during the second mode of operation; an aperture for access of the fluid from outside the head into the second space in the first mode of operation, and for exit from the second space in the second mode of operation, wherein, at the onset of the second mode of operation, the valve closes off the bore and subsequently moves the piston, thereby initiating a mechanical shearing action loosening any occluding matter in the aperture.

Abstract: An adjustable-rate flow regulator, including a split housing having an inverted-cup-shaped upper half connectable to a source of liquid to be dispensed, the upper half having a wall and a downward-facing bottom surface provided with an inlet port, and a lower half rotatably engaging the upper half, the lower half having a neck portion of reduced diameter and a recessed upper face having, at the bottom thereof, a control port leading to the consumer of the liquid. The regulator further includes an elastically deformable diaphragm seated on an annular step in the recess and defining with the bottom surface of the upper housing half a first chamber, and with the bottom of the recess in the lower housing half, a second chamber, and a tubular flow attentuator made of an elastomer, rotatably seated on, and fluid-tightly surrounding, the neck portion of the lower housing half, but non-rotatable relative to the upper housing half.

Abstract: A dual-diaphragm, adjustable-rate, pressure-compensated infusion regulator includes a housing having inlet and outlet ports and an intermediate member, and a flexible main diaphragm retained along a peripheral portion thereof in the intermediate member. The regulator further includes a flow-regulating valve consisting of a valve head accessible to a high-pressure source and a valve stem which is attached to the valve head, and a flow-attenuating element of adjustable attenuating effect. A flexible auxiliary diaphragm is retained along a peripheral portion thereof in a high-pressure region and incorporates a valve seat for the valve head, the valve seat and the valve head defining between them a gap through which the liquid passes on its way from the high-pressure source into the inlet chamber.

Abstract: A low-output flow regulator, including a housing, having an inlet aperture through which a liquid from a liquid source may enter, the inlet aperture is adapted to at least indirectly communicate with a consumer of the liquid, the housing comprises a raised portion with a recessed top surface provided with an opening leading at least indirectly to the consumer, and the raised portion has a circumferential wall surface projecting into the housing. The regulator further includes a cup-shaped elastomeric diaphragm consisting of a relatively thin and, in its position of rest, substantially plane active portion, and an annular wall portion integral with the active portion.

Abstract: An improvement of an adjustable-rate, flow-regulated, constant-output emitter comprising a flow-regulating valve having a valve head accessible to the high-pressure liquid and a valve stem one end of which is attached to, or integral with, the valve head, and a valve seat associated with the valve head and located in a high-pressure region upstream of a first chamber, the valve seat and the valve head defining between them a gap through which the liquid passes on its way from the high-pressure source into the first chamber, wherein the valve head is adapted to be acted upon by a first force tending to reduce the gap, and by a second force tending to increase the gap, a state of equilibrium between the forces defining the set point of the flow-regulated emitter.

Abstract: A flow-regulated drip emitter, including a housing provided with an inlet connector connectable into a relatively high-pressure liquid-line and an outlet opening, a flexible diaphragm retained along a peripheral portion thereof in the housing and dividing the interior of the housing into an inlet chamber and an outlet chamber, a flow-regulating valve comprised of a valve head accessible to the high pressure and a valve stem one end of which is attached to the valve head. The emitter further includes at least one flow-attenuating element disposed in the path of the liquid flowing from the inlet chamber into the outlet chamber, a valve seat associated with the valve head and located in a high-pressure region upstream of the inlet chamber, the valve seat and the valve head defining between them a gap through which the liquid passes on its way from the high-pressure line into the inlet chamber.

Abstract: A cyclic flow distributor having a body member provided with a plurality of n inlet chambers open towards one of the faces of the body member and connected in parallel to an inlet plenum connectable to a common supply line, and an identical plurality of n outlet chambers open towards the face of the body member, each outlet chamber separately connectable to at least one consumer line and being arranged in proximity to, and forming a functional pair with, an inlet chamber. The pair of chambers are separated by a partition.

Abstract: There is provided a proportioning system for mixture of the fluid to a liquid-carrying main line in a substantially constant, presettable proportion to the flow rate of the liquid in the main line. The system comprises pump means for drawing a quantity of fluid from a vessel and for injecting the quantity into the main line, pump-drive means impactable by the main-line liquid for driving the pump means, flowmeter means for monitoring the instantaneous flow rate of the main line and converting the flow rate into a flow-rate proportional rotary motion of an output member of a flowmeter means.

Abstract: There is provided a self-regulating sprinkling nozzle attachable to a liquid-carrying line. The nozzle comprises a housing, a vortex chamber inside the housing, a vortex-producing inlet means through which the liquid enters the vortex chamber. One wall of the chamber is constituted by a first surface of a stretchable diaphragm and the opposite wall of the chamber is provided with an aperture leading to the atmosphere. The second surface of the diaphragm is exposed to line pressure. The nozzle also comprises rotor disposed in a drive space and means entrained and set spinning by the vortex. A shaft portion of the rotor means passes through the aperture, and a liquid-throwing member is fixedly attached to, and spun by, the shaft portion as a result of the action of the vortex on the rotor means.

Abstract: A two-part housing in which is mounted an elastically stretchable diaphragm dividing the interior of the housing into a substantially peripheral inlet chamber, and a central outlet chamber. The underside of the diaphragm is accessible to the pressure prevailing in the inlet chamber while at least one substantially tangentially oriented passageway connects the peripheral inlet chamber and the central outlet chamber. An inverted cup-like rotor having a hollow shaft is rotatably mounted in the housing, and a tubular projection substantially aligned with the hollow shaft extends inside the rotor. The rotor has an annular peripheral wall, the inner surface of which is provided with at least one discontinuity serving as a race for a ball.

Abstract: There is provided a fluid flow-rate control device comprising a housing, an elastic stretchable membrane dividing the interior of said housing into a first and a second chamber; an inlet port of said housing leading to a fluid source and communicating with said first chamber; and an outlet port of said housing communicating with said second chamber; wherein the first and second chambers are in fluid communication via at least one passageway the dimensions of which remain unchanged during operation, and said membrane is fixedly held and positioned between said chambers so that when said membrane is exposed to a fluid pressure differential, it is adapted to be stretched and a portion thereof to move, solely by virtue of its elasticity, between positions closer to said outlet port to restrict the rate of flow therethrough, and positions further away from said outlet port to increase the rate of fluid flow therethrough, whereby the flow of fluid through said outlet port is controlled at a constant rate by said me

Abstract: There is provided an in-line, two-stage, variable-bypass injector pump for controllably admixing a secondary fluid to a main fluid. The pump comprises a housing connectable into a pipe line carrying the main fluid and a main venturi extending along the central axis of the housing having an entrance and a throat and exit portion. The pump also includes a secondary venturi off center but substantially parallel to the central axis. The exit portion of the secondary venturi leads into the throat portion of the main venturi. One end of a connector leads into the throat portion of the secondary venturi and the other end of the connector is connectable to a source of the secondary fluid. An eccentrically located passage way permits a variable proportion of the main fluid to flow from one end of the housing to the other end thereof, while bypassing the main venturi. The bypassed flow is controlled by means of a shutter between a maximum and zero flow.

Abstract: There is provided a self-regulating nozzle for a liquid supply line. The nozzle comprises a nozzle body attachable to the line, a vortex chamber within the body and a vortex producing inlet means through which the liquid in the line enters the vortex chamber. One wall of the vortex chamber is constituted by the surface of a stretchable diaphragm, the opposite wall of the chamber is provided with an aperture leading to the consumer and the other surface of the diaphragm is exposed to line pressure. The arrangement is such that the vortex produced by the inlet means results in the creation of a low pressure zone on the surface of the diaphragm which is exposed to the vortex chamber and the effective cross section of the aperture is controlled by the stretching of the stretchable diaphragm.

Abstract: There is provided an adjustable-rate, constant output infusion set connectable in-line in an intravascular infusion system. The infusion set comprises a connector piece connectable to a container for the infusion liquid and a head piece rotatably attached to the connector piece and connectable at its lower end to a tube leading to the infusion recipient. An elastically stretchable diaphragm is interposed between the connector piece and the head piece. The connector piece forms with the diaphragm a first chamber in direct communication with the container via an inlet port, and the head piece forms with the diaphragm a second chamber in direct communication with the recipient via a control port. The head piece is rotatably attachable to the connector piece for adjusting the flow rate therethrough. The set further comprises an annular member interposed between the connector piece and the head piece, and a passageway which connects the first chamber and the second chamber.

Abstract: A device and a system for controlling a fluid pressure are provided. The device comprises a spooltype pilot valve including a housing, a spring-biased displaceable elongated member having an innermost and an outermost sealing means defining at least one fluid-tight annular chamber between an outer surface of the member and an inner surface of the housing and having shoulder means dividing the housing into two further, substantially cylindrical chambers. The pilot valve further includes a first opening communicating with one of said cylindrical chambers at one side of said shoulder means for effecting the displacement of said member, a second opening communicating with said annular chamber, a third opening situated in very close proximity to, and on one side of, the outermost sealing means, and two venting openings.

Abstract: There is provided a proportioning device for connection to a main line carrying a pressurized fluid, for the purpose of introducing into or drawing from the main line a fluid at a rate standing in a substantially constant proportion to the flow rate of the main line. The device comprises a housing, at least one opening of which is connected to the main line and another opening of which is connected to the proportioning branch line. The device comprises a valve arranged in the housing and capable of closing the passage of the fluid into and from the proportioning branch line.