A device and method for selectively closing and opening a flow path through a sealing element. The device includes second and third tubulars positioned within a bore of a first tubular. A sealing element having a bore is positioned between the second and third tubulars within the bore of the first tubular. The sealing element may be connected to one or both of the tubulars. Bores of the second and third tubulars communicate with the bore of the sealing element to provide a flow path. Movement of the third tubular with respect to the second tubular buckles the sealing element inward to selectively close a portion of the flow path. The third tubular may be moved away from the second tubular to reopen the flow path. The sealing element may engage a structure within the bore of the sealing element to selectively close the flow path through the sealing element.

A drinking straw diaphragm is provided. The drinking straw diaphragm may provide a body circumscribing a flow opening fluidly communicative to straw portions on opposing end of the body. The flow opening is defined by opposing first and second edges cut through the body, wherein the first and second edges are biased in an open condition, but selectively movable between the open condition and the closed condition wherein the first and second edges engage, substantially reducing the flow opening in a controllable manner.

Wearable rubber parts for fluid handling systems include a four layer structure, wherein the inner most layer of the four layer structure is a polyurethane layer. The polyurethane can be millable polyurethane. The polyurethane used in the inner most layer can be produced by reacting diisolcyanate with a polyester and/or polyether polyols and a chain extender. The wearable rubber part can be an expansion joint, a pinch valve, or a hose.

Wearable rubber parts for fluid handling systems include a four layer structure, wherein the inner most layer of the four layer structure is a polyurethane layer. The polyurethane can be millable polyurethane. The polyurethane used in the inner most layer can be produced by reacting diisolcyanate with a polyester and/or polyether polyols and a chain extender. The wearable rubber part can be an expansion joint, a pinch valve, or a hose.

Embodiments include tubular diaphragm valves with a preformed mechanical closure point and optionally concave or convex convolution areas located near the flanges. These mechanical closure points and convolution areas give the embodiments an extended operational life, as compared to that of conventional cylindrical diaphragms.

Embodiments include tubular diaphragm valves with a preformed mechanical closure point and optionally concave or convex convolution areas located near the flanges. These mechanical closure points and convolution areas give the embodiments an extended operational life, as compared to that of conventional cylindrical diaphragms.

An anti-free-flow valve for use with an enteral feeding or infusion pump is disclosed. The valve includes a first component connectable to a first tube and has a first cavity and a sealing element and a second component adapted to be connected to the first component and a second tube and having a second cavity, a valve seat and a flexible portion. The sealing element and the valve seat are sealingly engageable to control fluid flow between the first and second cavities. The valve is configured such that applying an axial tension force between the first and second components brings the valve into an open position. The second component's flexible portion includes a bellows which has a spring function in the axial direction and a housing at least partially covering the second component and configured to operate as a stop limiting the axial movement of the second component.

An anti-free-flow valve for use with an enteral feeding or infusion pump is disclosed. The valve includes a first component connectable to a first tube and has a first cavity and a sealing element and a second component adapted to be connected to the first component and a second tube and having a second cavity, a valve seat and a flexible portion. The sealing element and the valve seat are sealingly engageable to control fluid flow between the first and second cavities. The valve is configured such that applying an axial tension force between the first and second components brings the valve into an open position. The second component's flexible portion includes a bellows which has a spring function in the axial direction and a housing at least partially covering the second component and configured to operate as a stop limiting the axial movement of the second component.

A system and method for the use of magneto-rheological fluids (MRF) and magnetically controlled elastomers (MCE) for use in fluid control and distribution apparatus which are responsive to control by a magnetic field are disclosed.

A system and method for the use of magneto-rheological fluids (MRF) and magnetically controlled elastomers (MCE) for use in fluid control and distribution apparatus which are responsive to control by a magnetic field are disclosed.