Abstract:
The tube of a constrictable tube valve is formed with a plural wall of which the outermost wall is shorter than the innermost wall. A metal housing with internal surfaces of varying perimeter or girth closely fits around the separate walls with the innermost wall extending outside the housing where it is radially flared over the faces of flanges on the housing. A plurality of connecting elements pass through the outermost wall of the tube and connect with the innermost wall. The free ends of the connecting elements are coupled to one or the other of two compressor members which exert closing pressure upon the tube. A separate metal fork having its tines inserted in a corresponding base on the innermost tube wall serves to anchor the respective connecting element thereto.
Abstract:
Clamps disposed at opposite sides of a tube of PTFE resin or other crack sensitive material maintain regions at each side of the tube in constantly constricted fluid sealing condition free from crack inducing flexure secured in sealing embrace about a smoothly curving filler piece. In combination with a pair of compressor members there is thus provided a constrictable tube valve having a tube of crack sensitive material which wild not crack upon valve manipulation.
Abstract:
A tube of P.T.F.E. resin with external bosses is produced by extruding the tube with external longitudinal ribs followed by removing sections of said ribs to leave said bosses. Thereupon connecting elements are secured to said bosses.
Abstract:
Notched edge clamps cooperate with lateral extensions on the compressor members for ensuring sealing while the clamps have smoothly rounded diverging mouths for preventing crack inducing flexure of the tube in a constrictable tube valve. A limber wishbone shaped yoke maintains sealing pressure. Wings on the compressor members with transition curves guide the tube during flexure. Connections with lost motion between bosses on the tube and respective wings provide positive opening. Resilient extensions are provided on a modification of the compressor members. The tube and bosses are formed by extruding a tube with longitudinal ribs and then machining away the undesired sections of the ribs.