Abstract: A pulsating device with two preset pressure-responding normally-closed valves is disclosed. The first valve is used for accumulating fluid. The second valve is used for creating resistance so as to force the first valve to open widely. The second valve may be configured so it creates little to no resistance once opened. In some embodiments, the pulsating device converts a low controlled and/or continuous flow of fluid, such as water and/or air, to a high pulsating and/or intermittent flow. A pulsating device may operate, for example, one or more drip lines, pop ups, sprinklers, misters and/or other irrigation devices.

Abstract: Apparatus for operating a group of normally closed, pressure compensated drippers at relatively low liquid flow rates includes a pulsating device having an inlet and an outlet that converts a low continuous liquid flow rate entering its inlet, through a flow control unit, to a high intermittent and pulsating flow rate ejected through its outlet. A manifold has an inlet connected to the outlet of the pulsating device, a group of normally-closed, pressure-compensated drippers being connected to the manifold. The pulsating device converts a low continuous flow rate of liquid entering its inlet, through the flow control unit, to a high intermittent and pulsating flow rate that ejects from its outlet and flows from its outlet through the manifold inlet and through the normally-closed, pressure-compensated group of drippers connected to the manifold, out from the drippers, at a pressure-compensated low flow rate.

Abstract: A pulsating device with two preset pressure-responding normally-closed valves is disclosed. The first valve is used for accumulating fluid. The second valve is used for creating resistance so as to force the first valve to open widely. The second valve may be configured so it creates little to no resistance once opened. In some embodiments, the pulsating device converts a low controlled and/or continuous flow of fluid, such as water and/or air, to a high pulsating and/or intermittent flow. A pulsating device may operate, for example, one or more drip lines, pop ups, sprinklers, misters and/or other irrigation devices.

Abstract: Apparatus for operating a group of normally closed, pressure compensated drippers at relatively low liquid flow rates includes a pulsating device having an inlet and an outlet that converts a low continuous liquid flow rate entering its inlet, through a flow control unit, to a high intermittent and pulsating flow rate ejected through its outlet. A manifold has an inlet connected to the outlet of the pulsating device, a group of normally-closed, pressure-compensated drippers being connected to the manifold. The pulsating device converts a low continuous flow rate of liquid entering its inlet, through the flow control unit, to a high intermittent and pulsating flow rate that ejects from its outlet and flows from its outlet through the manifold inlet and through the normally-closed, pressure-compensated group of drippers connected to the manifold, out from the drippers, at a pressure-compensated low flow rate.

Abstract: Apparatus for operating a group of normally closed, pressure compensated drippers at relatively low liquid flow rates includes a pulsating device having an inlet and an outlet that converts a low continuous liquid flow rate entering its inlet, through a flow control unit, to a high intermittent and pulsating flow rate ejected through its outlet. A manifold has an inlet connected to the outlet of the pulsating device, a group of normally-closed, pressure-compensated drippers being connected to the manifold. The pulsating device converts a low continuous flow rate of liquid entering its inlet, through the flow control unit, to a high intermittent and pulsating flow rate that ejects from its outlet and flows from its outlet through the manifold inlet and through the normally-closed, pressure-compensated group of drippers connected to the manifold, out from the drippers, at a pressure-compensated low flow rate.

Abstract: Apparatus for operating a group of normally closed, pressure compensated drippers at relatively low liquid flow rates includes a pulsating device having an inlet and an outlet that converts a low continuous liquid flow rate entering its inlet, through a flow control unit, to a high intermittent and pulsating flow rate ejected through its outlet. A manifold has an inlet connected to the outlet of the pulsating device, a group of normally-closed, pressure-compensated drippers being connected to the manifold. The pulsating device converts a low continuous flow rate of liquid entering its inlet, through the flow control unit, to a high intermittent and pulsating flow rate that ejects from its outlet and flows from its outlet through the manifold inlet and through the normally-closed, pressure-compensated group of drippers connected to the manifold, out from the drippers, at a pressure-compensated low flow rate.

Abstract: Embodiments of the invention provide an irrigation pop-up with a flexible stem which may be a pulsating or conventional (i.e., non-pulsating) irrigation sprayer or sprinkler. The flexible stem enables an extended stem to be bent instead of being severed, as experienced by traditional irrigation systems, if impacted by an outside force. In one embodiment, the flexible stem contains a lower rigid segment and an upper rigid segment, each having a passageway extending from an inlet, through the segment, to an outlet. An elastic hollow member, such as a rubber tube, is coupled to and in fluid communication with the passageways of the lower and upper rigid segments. Therefore, a water flow path extends from the water inlet, through the passageway within the lower rigid segment, through the channel of the elastic hollow member, through the passageway within the upper rigid segment, and out through the nozzle, such as a sprayer or sprinkler.

Abstract: Embodiments of the invention provide an irrigation pop-up with a flexible stem which may be a pulsating or conventional non-pulsating irrigation sprayer or sprinkler. The flexible stem enables an extended stem to be bent instead of being severed, as experienced by traditional irrigation systems, if impacted by an outside force. In one embodiment, the flexible stem contains a lower rigid segment and an upper rigid segment, each having a passageway extending from an inlet, through the segment, to an outlet. An elastic hollow member, such as a rubber tube, is coupled to and in fluid communication with the passageways of the lower and upper rigid segments. Therefore, a water flow path extends from the water inlet, through the passageway within the lower rigid segment, through the channel of the elastic hollow member, through the passageway within the upper rigid segment, and out through the nozzle, such as a sprayer or sprinkler.

Abstract: This invention relates to pulsating rotating sprinklers which can be used for irrigation and for other applications. Such sprinklers are especially useful when their inlet is connected to an outlet from a pulsating device, which intermittently ejects pulsating fluid jets into the inlet of the sprinklers. A typical such sprinkler consists of a floating cylinder enclosed in a casing. The cylinder, which has a fluid inlet and a fluid outlet, is floating, rotating, and intermittently ejecting pulsating jets of fluid. The combination of such a floating sprinkler and the unique properties of a pulsating device can be also used for operating innovative pulsating pop-up sprinklers.

Abstract: This invention relates to pulsating devices which are used for converting a low continuous flow to a high intermittent pulsating flow. The pulsating device consists of an insert, an elastic tube and a casing that is without venting perforations at its outer periphery. The casing surrounds the elastic tube and forms a space between the inner surface of the rigid casing and the outer surface of the elastic tube. By using a casing which has a large space relative to the change in volume of the elastic tube, expansion of the elastic tube can be done without providing venting perforations in the casing. Fluid flows into the pulsator through its inlet at a low controlled continuous flow rate and is ejected through its outlet at a high intermittent pulsating flow. In such a case the volume of air surrounding the elastic tube and enclosed in the casing is only slightly compressed during the expansion of the elastic tube which causes a negligible increase in pressure of the air surrounding the elastic tube.

Abstract: Water driven robots are provided which can be used for moving different objects at different controlled directions and frequencies to obtain energy and power from the flow of a liquid, such as water. A container (10) contains a siphonic outlet which is capable of converting relatively low continuous flow of water, entering through its inlet (17), to a relatively high intermittent pulsating flow of water, ejected from its outlet (23). Such flow is used for moving the robot as follows: During each cycle, water fills the container so that its weight increases, causing the container to move down and move a pulley (65) or other object (73). When the container's liquid level reaches the inlet of the siphon, it rapidly drains and becomes lighter, thereby resulting in a return of the weight. Thus a continuous inflow of liquid causes the container to oscillate vertically and provides force, energy, and power for operating such robots, for controlling their motion, and for operating work loads connected to the robots.

Abstract: This invention relates to pulsating drip laterals for use in irrigation and other applications. The combination of pulsators and drip laterals is used for decreasing the flow of the drippers and for decreasing their chance of getting plugged. More specifically, this invention relates to pulsating drip laterals in which the pulsators are made so that pressurized fluid can flow through them while, at the same time, a low continuous flow of some of the fluid flows out from each pulsator at high intermittent pulsating flow to a group of drippers. It farther relates to pulsators that are connected in line of different types of drip conduit and to drip laterals in which pulsators are inserted in the drip conduits during the extrusion process of the conduits.

Abstract: A device and method, especially adapted for operating sprinklers, shower heads etc. at low flow, converts low continuous liquid flow to a high intermittent and pulsating flow. The liquid is introduced at a controlled low rate of flow, such as by the use of a pressure-compensated dripper in a liquid supply line. The liquid then flows into a chamber which is somewhat expandable in volume. The pressure increases in the chamber while outflow of the liquid is restricted until pressure created by introduction of the liquid is sufficient to eject the fluid intermittently at a higher flow. This is achieved by utilizing a pressure-responsive valve in the liquid exit of the container. The valve has a preset pressure response designed for quick response to create a water hammer effect. The valve has openings which create a pumping effect to admix air or another liquid with the effluent stream.

Abstract: This invention relates to a device and method for converting low continuous liquid flow to a high intermittent and pulsating flow. They are especially adapted for operating sprinklers, shower heads and venturi pumps at low flow. Applicant has accomplished these objectives by introducing liquid at a controlled low rate of flow such as by the use of pressure compensating drippers in a liquid supply line, thence into a chamber which is somewhat expansible in volume and increasing pressure therein while restricting the outflow of the liquid until pressure created by introduction of such liquid is sufficient to eject the liquid intermittently at a higher flow and over a greater area. This is achieved by utilizing a pressure responsive check valve in the liquid exit and more particularly by utilizing a check valve designed for quick response to create a water hammer effect.

Abstract: A device for irrigating plants comprises a container adapted to be mounted adjacent to each plant to be irrigated and to be filled at a low rate over a long period of time, for example around-the-clock. The container further includes a water discharge conduit having a loop portion at a pre-fixed height above the container bottom, the arrangement being such that when the water has accumulated within the container to substantially the top of the loop portion, there is produced automatically, and without the movement of any parts, a siphonic-flow-discharge of the water container at a high rate and over a short period of time.