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Inline valve assembly having a body with an axial bore and guide slots extending in a direction perpendicular to the bore, a flexible tubular liner having an axially extending flow passageway with a generally cylindrical side wall disposed in and supported by the bore, throttling pins mounted in the

Inline valve assembly having a body with an axial bore and guide slots extending in a direction perpendicular to the bore, a flexible tubular liner having an axially extending flow passageway with a generally cylindrical side wall disposed in and supported by the bore, throttling pins mounted in the guide slots in engagement with the side wall on opposite sides of the liner, and cam members rotatively mounted on the valve body for urging the pins together against the side wall to restrict flow through the passageway.

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1. An inline valve assembly, comprising a valve body having an axially extending circular bore and guide slots extending in a direction perpendicular to the bore, a flexible tubular liner having an axially extending flow passageway with a generally cylindrical side wall disposed in and supported by

1. An inline valve assembly, comprising a valve body having an axially extending circular bore and guide slots extending in a direction perpendicular to the bore, a flexible tubular liner having an axially extending flow passageway with a generally cylindrical side wall disposed in and supported by the bore, stub shafts extending from opposite sides of the valve body, cam members rotatably mounted on the stub shafts and connected together for rotation in concert on opposite sides of the valve body, throttling pins mounted in the guide slots on opposite sides of the liner with end portions of the throttling pins extending into recessed areas in the cam members, and cam surfaces formed by side walls of the recessed areas in driving engagement with the end portions of the throttling pins for urging the pins together against the side wall of the liner to squeeze the liner on both sides in a substantially identical manner to restrict flow through the passageway. 2. The valve assembly of claim 1 wherein the valve body comprises an elongated housing with connecting flanges at opposite ends thereof, and the liner has a tubular body with gaskets that form seals with outer sides of the flanges. 3. The valve assembly of claim 2 wherein the tubular body and the gaskets are molded as a unitary structure of a single material, with the passageway extending continuously and smoothly through the tubular body and the gaskets, with no crevices or other areas in which contamination can collect. 4. The valve assembly of claim 1 wherein the liner has loops which encircle the throttling pins. 5. The valve assembly of claim 1 including cavities formed in the valve body in communication with opposite sides of the bore between the guide slots to permit controlled expansion of the liner in a direction parallel to the pins as the liner is squeezed together between the pins. 6. The valve assembly of claim 1 wherein each of the cam members has a generally circular end wall in which the recessed area and a bore for the stub shaft are formed and spacers which position the end walls of the two cam members parallel to each other, with the side walls of the recessed areas in the two cam members aligned to keep the throttling pins parallel to each other and moving in a substantially identical manner to apply substantially equal forces to both sides of the liner. 7. The valve assembly of claim 1 including a latch pin on one of the cam members engagable with a notch in the valve body to hold the valve assembly in a closed position. 8. The valve assembly of claim 1 wherein the liner is fabricated of a material selected from the group consisting of EPDM rubber, polytetra-fluoroethylene (PTFE), and other elastomers. 9. The valve assembly of claim 1 wherein the guide slots have end walls that limit travel of the throttling pins toward each other and prevent over-squeezing of the liner. 10. An inline valve assembly, comprising a valve body formed in two sections with an axially extending circular bore and guide slots extending in a direction perpendicular to the bore, a flexible tubular liner having an axially extending flow passageway with a generally cylindrical side wall disposed in and supported by the bore and a flange that extends lengthwise of and outwardly from the side wall and is secured between the two sections of the valve body, throttling pins mounted in the guide slots on opposite sides of the liner, and cam members which are connected together for rotation in concert on opposite sides of the valve body and have cam surfaces that engage end portions of the throttling pins and urge the pins together against the side wall to squeeze the liner on both sides in a substantially identical manner to restrict flow through the passageway. 11. The valve assembly of claim 10 wherein the guide slots have end walls that limit travel of the pins toward each other and protect the liner from being squeezed too tightly. 12. The valve assembly of claim 10 wherein the valve body has connecting flanges at opposite ends thereof, the flexible liner has a tubular body with radially extending gaskets formed integrally with and at opposite ends of the tubular body, with the flow passageway extending continuously and smoothly through the tubular body and the gaskets with no crevices or other areas in which contamination can collect, the tubular body fitting snugly in the bore and being supported radially by the valve body throughout substantially the entire length of the tubular body, and the gaskets positioned on the outer sides of the connecting flanges for sealing engagement with corresponding connectors in an external line. 13. The valve assembly of claim 12 wherein the tubular body and the gaskets are molded as a unitary structure of a single material. 14. An inline valve assembly, comprising: a flexible liner having an elongated tubular body with an axially extending flow passageway, radially extending gaskets at opposite ends of the tubular body, loops extending from opposite sides of the tubular body, and flanges that extend lengthwise of the tubular body and outwardly from the opposite sides of the tubular body, with gaps between the loops and the flanges permitting limited movement of the tubular body and the loops relative to the flanges;a split valve body having an elongated housing formed in two sections with connector fittings at opposite ends thereof, an axial bore extending through the housing and the fittings, the tubular body of the liner extending through the bore, the gaskets positioned on the outer sides of the connector fittings for making fluid-tight connections between the liner and an external flow line, the liner flanges disposed between the two sections of the valve body, shafts extending from opposite sides of the valve body along an axis of rotation perpendicular to the axis of the bore, and guide slots spaced equally from the axis of rotation extending in a direction perpendicular to the axis of the bore on opposite sides of the bore;laterally movable throttling pins passing through the loops on opposite sides of the liner and constrained by the guide slots in the valve body for movement parallel to each other along a line perpendicular to the liner; andcam members which are mounted on the shafts extending from the valve body and are connected together for rotation in concert, with cam surfaces disposed eccentrically of the axis of rotation engaging the throttling pins for pushing the pins together to squeeze the liner from opposite sides in a similar manner to restrict flow through the passageway. 15. The valve assembly of claim 14 wherein the body shafts are received in aligned bores in the cam members, with rounded ends of the shafts engaging flat bottom walls of the aligned bores. 16. The valve assembly of claim 15 wherein the cam members are connected together by screws, and the two sections of the valve body are held together by the bottom walls of the bores. 17. The valve assembly of claim 14 including a latch pin on one of the cam members engagable with a notch in the valve body to hold the valve assembly in a predetermined position. 18. The valve assembly of claim 14 including cavities formed in the valve body in communication with opposite sides of the axial bore between the guide slots to permit controlled expansion of the liner in a direction parallel to the pins as the liner is squeezed together between the pins. 19. The valve assembly of claim 14 wherein the cam members have generally circular base walls with recessed areas having side walls that form the cam surfaces, and the aligned shaft bores extend from the recessed areas. 20. The valve assembly of claim 14 wherein the shafts extending from the valve body have laterally extending openings through which the throttling pins pass in moving toward and away from each other. 21. The valve assembly of claim 14 wherein the guide slots have end walls that limit travel of the throttling pins toward each other and prevent over-squeezing of the liner.