Abstract: A valve assembly is disclosed for permitting relatively free flow in a flow path in a first direction and for preventing flow in the path in a second, opposite direction. The assembly includes a resilient flow regulator including a pair of lips arranged in a converging relationship to define a normally closed slit at the outer ends of the lips. An annular flange extends outwardly about the opposite end of the regulator. A housing outlet portion defines a housing interior approximating the shape of the regulator. The housing outlet portion further includes an annular collar disposed outwardly adjacent the base of each planar surface. The regulator is diposed within the housing outlet portion with the flange contained within the collar, and with the lips being adjacent to but not in contact with the interior housing surface. A cover plate is attached to the collar for securing the regulator and for sealing the housing.

Abstract: A needle valve is formed by molding a resilient tip to a rigid body having a tip receiving cylindrical portion or barrel which includes tip retaining means for securing the resilient tip thereto. The tip is then ground until the outer edge of the barrel is engaged to form a resilient single angle or simple conical tip to thereby eliminate distortions which may be present in the molded tip. The tip retaining means comprises either a socket formed into the distal end of the barrel or a mushroom-shaped bayonet projection extending therefrom.