Patent ID: 6142980
Filing Date: 2000-11-07
Classification: A61M,Y10T

Abstract:
A multi-function medical control valve comprising;a housing assembly including an inlet housing defining an inlet passage and an outlet housing defining an outlet passage;a unidirectional flow valve mounted in said housing assembly and operable to only permit fluid to flow from said inlet passage into said outlet passage;a positive pressure relief valve supported from said outlet housing and operable to vent pressure from said outlet passage to ambient when the pressure in said outlet passage exceeds a predetermined maximum positive pressure value; anda negative pressure relief valve supported from said outlet housing and operable to draw ambient air though a flow path into said outlet passage when the pressure in said outlet passage exceeds a predetermined maximum negative pressure value, said negative pressure relief valve including a valve member movable between a closed position preventing air flow through said flow path and an open position permitting air flow through said flow path, a spring exerting a preload on said valve member for urging said valve member toward its closed position, andan end cap secured to a shank segment of said valve member for acting on said valve member for selectively varying the preload exerted by said spring on said valve member by adjusting a position of said end cap relative to said valve member to thereby cause a corresponding change in said predetermined maximum negative pressure value.