Abstract: A check valve nozzle having at least two discharge ports and providing improved mixing between the discharged fluid and the receiving fluid. The check valve nozzle may be of a “duckbill” type or a “pancake” type. The “duckbill” type may have discharge ports that vary in size, orientation with respect to the longitudinal centerline of the check valve nozzle, and/or construction materials. The “pancake” type may discharge the fluid from the check valve nozzle in a perpendicular, forward, or rearward direction. The check valve nozzle assembly contains a number of check valve nozzles that can vary in size, orientation with respect to the longitudinal centerline of the end cap of the assembly, and/or construction materials.

Abstract: A check valve nozzle having at least two discharge ports and providing improved mixing between the discharged fluid and the receiving fluid. The check valve nozzle may be of a “duckbill” type or a “pancake” type. The “duckbill” type may have discharge ports that vary in size, orientation with respect to the longitudinal centerline of the check valve nozzle, and/or construction materials. The “pancake” type may discharge the fluid from the check valve nozzle in a perpendicular, forward, or rearward direction. The check valve nozzle assembly contains a number of check valve nozzles that can vary in size, orientation with respect to the longitudinal centerline of the end cap of the assembly, and/or construction materials.

Abstract: A flow control pinch valve comprises a flexible outer sleeve and a flexible inner sleeve concentrically disposed within and spaced from the outer sleeve, wherein the inner sleeve defines a passageway for allowing fluid to pass therethrough. The sleeves are attached to each other at each end thereof and adapted to be attached to an inner surface of a fluid conduit. An annular space for receiving pressurized fluid is defined between the inner sleeve and the outer sleeve such that the inner sleeve is configured to deflect inwardly thereby controlling fluid flow through the passageway. A first clamping ring is concentrically disposed within the inner sleeve and the outer sleeve at one end; and a second clamping ring is concentrically disposed within the inner sleeve and the outer sleeve at an opposite end, wherein the clamping rings are used to secure the control valve within a pipe.

Abstract: An apparatus (16) for preventing stagnation in a fluid reservoir (2) comprised of: an inlet/outlet conduit (6); a manifold (8), which communicates the inlet/outlet conduit (6) to inlet check valves (10) and outlet check valves (12); the inlet check valves (10) being positioned on the manifold (8) and being oriented such that a fluid (14) will flow from the manifold (8) through the inlet check valves (10) to the reservoir (2) during reservoir filling and fluid flow is prevented through the inlet check valves (10) during reservoir draining; and the outlet check valves (12) being positioned on the manifold (8) and spaced from the inlet check valves (10) to provide fluid flow within the reservoir (2) in the general direction from the inlet check valves (10) to the outlet check valves (12), the outlet check valves (12) being oriented such that fluid flows from the reservoir (2) through the outlet check valves (12) into the manifold (8) during reservoir draining and fluid flow through the outlet check valves (12) i

Abstract: A large diameter check valve has an upstream inlet part mountable on a discharge end of a conduit, a downstream outlet part adapted to prevent backflow of fluid through the check valve, and a transition part located between the upstream inlet part and the downstream outlet part. A support is included in the check valve to prevent drooping of the check valve via a cantilever effect. A method for supporting a check valve is also disclosed.

Abstract: A large diameter check valve has an upstream inlet part mountable on a discharge end of a conduit, a downstream outlet part adapted to prevent backflow of fluid through the check valve, and a transition part located between the upstream inlet part and the downstream outlet part. A support is included in the check valve to prevent drooping of the check valve via a cantilever effect. A method for supporting a check valve is also disclosed.

Abstract: A pinch valve for connection between an upstream pipeline and a downstream pipeline, the pinch valve including a body having a fixed upper pinch bar and a moveable lower pinch bar, an elastomeric sleeve, wherein the elastomeric sleeve is situated between the fixed upper pinch bar and the moveable lower pinch bar, and means to raise and lower the moveable lower pinch bar. A method of regulating fluid flow is also disclosed.

Abstract: An apparatus (16) for preventing stagnation in a fluid reservoir (2) comprised of: an inlet/outlet conduit (6); a manifold (8), which communicates the inlet/outlet conduit (6) to inlet check valves (10) and outlet check valves (12); the inlet check valves (10) being positioned on the manifold (8) and being oriented such that a fluid (14) will flow from the manifold (8) through the inlet check valves (10) to the reservoir (2) during reservoir filling and fluid flow is prevented through the inlet check valves (10) during reservoir draining; and the outlet check valves (12) being positioned on the manifold (8) and spaced from the inlet check valves (10) to provide fluid flow within the reservoir (2) in the general direction from the inlet check valves (10) to the outlet check valves (12), the outlet check valves (12) being oriented such that fluid flows from the reservoir (2) through the outlet check valves (12) into the manifold (8) during reservoir draining and fluid flow through the outlet check valves (12) i

Abstract: A support mechanism for a tide gate valve having an internal cavity, wherein the support mechanism includes a support body receivable in the tide gate valve cavity to help prevent the tide gate valve from collapsing in on itself when subjected to backflow pressure. The support mechanism is positioned adjacent to a pipe end and can take the shape of a ring having legs or flanges, a cage, a partial or more than partial cone, or other suitable shape. Moreover, arms can extend from the ring to provide further support and orifices can be added to the support mechanism to increase or decrease flow characteristics.

Abstract: A passive flow control valve including a barrier member positioned in a fluid conduit between an upstream conduit portion and a downstream conduit portion. The barrier member substantially prevents fluid flow around a barrier member perimeter. The passive flow control valve also includes barrier member orifices extending through the barrier member, which allow controlled fluid flow through the barrier member orifices. When the fluid flows through the upstream conduit portion and encounters the barrier member, the fluid is prevented from passing around the barrier member perimeter and is forced to flow through the barrier member orifices.

Abstract: A passive flow control valve including a barrier member positioned in a fluid conduit between an upstream conduit portion and a downstream conduit portion. The barrier member substantially prevents fluid flow around a barrier member perimeter. The passive flow control valve also includes barrier member orifices extending through the barrier member, which allow controlled fluid flow through the barrier member orifices. When the fluid flows through the upstream conduit portion and encounters the barrier member, the fluid is prevented from passing around the barrier member perimeter and is forced to flow through the barrier member orifices.

Abstract: A check valve for placement in a fluid conduit, includes a separator element with at least one opening; the opening allows fluid flow through the separator element. A pliant sealing member is attached to a downstream side of the separator element, covering the opening. During forward flow, this pliant sealing member deforms, allowing fluid to pass around it. However, during reverse fluid flow, this pliant sealing member flattens and covers the opening, preventing reverse fluid flow through the opening.

Abstract: A diffuser includes a substantially rigid base member having a first side and a second side, and an inlet conduit defining a central bore depending from the second side of the base member. A resilient dome member having a plurality of perforations is sealed to a peripheral edge of the first side of the base member. A coupling member, preferably in the form of a check valve, provides cooperation with a fluid source. As the diffuser is pressurized the dome member expands away from the base member and fluid is diffused by the perforations.

Abstract: A check valve having an upstream inlet part mountable on a discharge end of a conduit, a downstream outlet part adapted to prevent backflow of fluid through the check valve, and a transition part located between the upstream inlet part and the downstream outlet part. A longitudinal dimension of the downstream outlet part extending in a direction transverse to a direction of flow is at least approximately 1.57 times the diameter of the upstream inlet part.

Abstract: An air diffuser system contains a manifold and a plurality of elastomeric "duckbilled" check valves. The manifold is constructed from a conduit material and can be arranged in many different configurations. The valves are made from an elastomeric material, such as rubber, preventing the valves from being clogged with sludge, sediment, or other debris commonly found in waste treatment water. Additionally, the valves can be bored with predetermined orifice sizes, allowing the volume and pressure of escaping air to be determined prior to installation. To make installation of the valves easier, various types of coupling devices may be used to attach the valves to the manifold. Examples of coupling devices include restrictive orifices, "Y"-shaped conduits, and nipple conduits. Multiple valves can also be fabricated on a common cuff prior to installation.

Abstract: An asymmetrical check valve has an inlet end, a transition part and an outlet end, with a pair of vertical lips facing one another. The lips may be flat or they may be curvilinear. The check valve is asymmetric about a horizontal longitudinal plane through the check valve. The bottoms of the transition part and outlet end may be aligned, with a major portion of the lips extending above the horizontal plane. It is thus possible to install conventional or wide bill check valves in installations with little or no clearance between the outlet end and ground level.

Abstract: The present invention is directed to an inversion-resistant tide gate valve comprising a generally tubular sleeve bounding a longitudinally-extending flow-through passage for fluids, the sleeve having an upstream fluid inlet end region adapted to be affixed to an effluent conduit and a downstream fluid outlet region, the downstream fluid outlet region of the sleeve being integrally formed with a longitudinally-extending trough, where the trough is formed of an integral bottom wall and an integral pair of side walls. A disc is affixed along a first portion of its periphery with a flexible member to the downstream fluid outlet region of the sleeve, and a second portion of the periphery of the disc opposite the first portion rests within the trough on the bottom wall of the trough.

Abstract: An inversion-resistant check valve or tide gate valve which comprises a sleeve bounding in a longitudinally-extending flow-through passage for fluids. The sleeve has an upstream fluid inlet end region mountable on a discharge end of a conduit which is elongated along a longitudinal axis of symmetry. The sleeve also has a downstream fluid outlet end region comprised of two or more lips which are opposed to each other and symmetrically arranged relative to the axis, wherein the lips extend a defined length along the axis, the defined length being within the range of about 1:1.5 to 1:9 times the diameter of the conduit.

Abstract: A method of making a pressure relief valve includes embedding a pair of opposed plates within a pair of valve lips, forming holes in the lips, inserting springs into the holes into engagement with the plates, and tensioning the springs to constantly urge the lips toward each other.

Abstract: A pressure relief valve has coil springs embedded within valve lips for constantly urging the lips closed. The internal springs resist environmental corrosion, and eliminate multi-part complex valve actuators.