Patent ID: 7779842

Claim:
A suction system having a suction tube, a source of suction, and a suction control valve, said suction control valve comprising a housing having a first central circular passageway extending through and thus creating an air and fluid flow path area through said housing and in fluid communication at one end thereof with the suction tube and with the suction source at the other end thereof, said housing having a second circular passageway which traverses said first central passageway and terminates in an airtight lower terminal portion defined by said housing, a resiliently molded manually movable and releasable plunger operable in connection with said second passageway wherein said plunger includes an upper portion and a lower portion, said lower portion having a first slideable seal to seal said first central passageway and said upper portion having a second slideable seal positioned above said first slideable seal, said second slideable seal having straight sided sidewalls including an outwardly expanding completely circular wiper seal protrusion compressively form fitted into said second passageway, said lower portion being normally positioned with said plunger in a normally downwardly resiliently compression biased non-suction applied position and further manually movable to a suction applied position said plunger having a cross lumen of a cross-sectional area at least as large as the cross-sectional area of said first passageway such that when the cross-sectional area of said cross lumen is aligned with the cross-sectional area of said first passageway, said cross lumen does not restrict the flow path area of said first passageway so as to create an unrestricted and unobstructed negative pressure air flow path and unrestricted and unobstructed fluid secretion flow path communication between said suction tube and said source of suction, and said second slideable seal preventing fluid access to said upper portion of the plunger during the manual movement of said plunger to said suction applied position.