The present invention relates to the fluid discharge device of a fluid transfer pipe, and to a technology which alters the sectional area of a discharge hole in proportion to the increase or decrease in fluid discharge flow per unit of time so as to maintain a relatively uniform fluid discharge rate from the discharge hole.

The present invention relates to the fluid discharge device of a fluid transfer pipe, and to a technology which alters the sectional area of a discharge hole in proportion to the increase or decrease in fluid discharge flow per unit of time so as to maintain a relatively uniform fluid discharge rate from the discharge hole.

A fluidic device comprises a channel, a gate, and one or more additional elements. The channel is configured to transport a fluid from a source to a drain. The gate includes a chamber with an adjustable volume that affects fluid flow within the channel by displacing a wall of the channel toward an opposite wall of the channel based in part on fluid pressure within the chamber exceeding a threshold pressure. A high pressure state of the gate corresponds to a first chamber size and a first flow rate of the fluid. A low pressure state of the gate corresponds to a second chamber size that is smaller than the first chamber size and a second flow rate that is greater than the first flow rate. The additional elements are configured to reduce the threshold pressure past which the chamber decreases the cross-sectional area of the channel.

A fluidic device controls fluid flow in channel from a source to a drain. In some embodiments, the fluidic devices comprise a gate, a channel, and an obstruction. The gate comprises at least one chamber whose volume increases with fluid pressure. A high-pressure state of the gate corresponds to a first chamber size and a low-pressure state of the gate corresponds to a second chamber size that is smaller than the first chamber size. The obstruction controls a rate of fluid flow within the channel based on the fluid pressure in the gate. The obstruction induces at most a first flow rate of fluid in the channel in accordance with the low-pressure state of the gate, and at least a second flow rate of the fluid in the channel in accordance with the high-pressure state of the gate.

A guide element for hydraulic fluid includes a first end surface, a second end surface, and an exterior surface connecting the first end surface to the second end surface. The first end surface includes a first chamfered opening. The second end surface includes a second opening that fluidly communicates with the first opening to define a longitudinal bore that includes a tapered section. The first chamfered opening and the tapered section are configured to guide the hydraulic fluid to facilitate transformation of a turbulent flow of the hydraulic fluid into a laminar flow of the hydraulic fluid.

A guide element for hydraulic fluid includes a first end surface, a second end surface, and an exterior surface connecting the first end surface to the second end surface. The first end surface includes a first chamfered opening. The second end surface includes a second opening that fluidly communicates with the first opening to define a longitudinal bore that includes a tapered section. The first chamfered opening and the tapered section are configured to guide the hydraulic fluid to facilitate transformation of a turbulent flow of the hydraulic fluid into a laminar flow of the hydraulic fluid.

A combination valve for pressure building and final-line gas regulation is disclosed. An example valve includes a body defining a first tank port and a second tank port, an outlet port, and a linking chamber fluidly connected to the second tank port. The valve includes a first piston diaphragm at least partially defining a first pressure cavity fluidly connected to the first tank port and a first plug operatively connected to the first piston diaphragm. The first pressure cavity is fluidly connected to the linking chamber when the first plug is in an open position. The valve includes a second piston diaphragm at least partially defining a second pressure cavity fluidly connected to the outlet port and a second plug operatively connected to the second piston diaphragm. The second pressure cavity is fluidly connected to the linking chamber when the second plug is in an open position.

A combination valve for pressure building and final-line gas regulation is disclosed. An example valve includes a body defining a first tank port and a second tank port, an outlet port, and a linking chamber fluidly connected to the second tank port. The valve includes a first piston diaphragm at least partially defining a first pressure cavity fluidly connected to the first tank port and a first plug operatively connected to the first piston diaphragm. The first pressure cavity is fluidly connected to the linking chamber when the first plug is in an open position. The valve includes a second piston diaphragm at least partially defining a second pressure cavity fluidly connected to the outlet port and a second plug operatively connected to the second piston diaphragm. The second pressure cavity is fluidly connected to the linking chamber when the second plug is in an open position.

A device is provided for controlling the flow of a fluid through a conduit from an upstream side to a downstream side of the device. The device includes a valve aperture, a cylindrical mounting member on the downstream side of the valve aperture, a valve member on the outside of the cylindrical mounting member that moves reciprocally to open and close the valve aperture, a control volume defined between the cylindrical mounting member and the valve member, an arrangement for introducing a control pressure into the control volume, and a seal between the outer surface of the cylindrical mounting member and the inner surface of the valve member that substantially seals the control volume. The valve member is acted on by the pressure of the upstream side (P.sub.1) and the control pressure (P.sub.4) so as to be moved by the difference between these pressures.

An apparatus, especially adapted for regulating flow of in-line drip irrigation device emitters. The disclosed apparatus converts high liquid flow to a low flow rate as low as 0.02 gallons per hour. The liquid is introduced at a controlled high flow rate, such as by the use of a pressurized fluid supply conduit. The liquid then flows into a number of inlet inflow gates before traversing a pressure responding diaphragm. The closing pressure response of the pressure responding diaphragm, provided primarily by a number of elastomeric o-rings, must be overcome by the pressurized fluid entering through the inlet inflow gates before transmitting regulated fluid flow through an outlet means, wherein said ancillary elastomeric o-ring is a rubber annular component assembled with a tubular rigid insert prior to insertion of drip line extrusion. The present invention provides an apparatus and method for regulating flow of pressure-responding diaphragms of extruded in-line irrigation device emitters'.