Patent ID: 7614529
Filing Date: 2009-11-10
Classification: B05B,B05C,Y10T

Abstract:
1. A spool valve and valve seat assembly for use within a fluid dispensing control module, comprising: a spool valve having a longitudinal axis, first and second axially spaced valve seat portions defined upon said spool valve, and first and second axially spaced shoulder portions defined upon said spool valve adjacent to said first and second axially spaced valve seat portions; a valve seat member having first and second axially spaced valve seat portions defined upon said valve seat member, and first and second axially spaced shoulder portions defined upon said valve seat member at substantially axially central portions of said valve seat member which are spaced axially remote from said first and second axially spaced valve seat portions of said valve seat member; said spool valve being axially movable, with respect to said valve seat member, between first and second extreme positions, wherein said first valve seat portions of said spool valve and said valve seat member operatively cooperate together, as a result of said first valve seat portion of said spool valve being disposed at a first seated position upon said first valve seat portion of said valve seat member, when said spool valve is disposed at said first extreme position, so as to define a CLOSED position with respect to said first valve seat portion of said valve seat member and thereby prevent the flow of a fluid, through a first space defined between said first valve seat portions of said spool valve and said valve seat member, toward a first fluid passage, while second valve seat portions of said spool valve and said valve seat member operatively cooperate together, as a result of said second valve seat portion of said spool valve being disposed at a second fully unseated position with respect to said second valve seat portion of said valve seat member, when said spool valve is disposed at said first extreme position, so as to define a fully OPEN position with respect to said second valve seat portion of said valve seat member and thereby permit the flow of the fluid, through a second space defined between said second valve seat portions of said spool valve and said valve seat member, toward a second fluid passage, and wherein said first valve seat portions of said spool valve and said valve seat member operatively cooperate together, as a result of said first valve seat portion of said spool valve being disposed at a second unseated position with respect to said first valve seat portion of said valve seat member, when said spool valve is disposed at said second extreme position, so as to define an OPEN position with respect to said first valve seat portion of said value seat member and thereby permit the flow of the fluid, through said first space defined between said first value sear portions of said spool value and said valve seat member, toward said first fluid passage, while said second value seat portions of said spool value and said value seat member operatively cooperate together, as a result of said second valve seat portion of said spool valve being disposed at a seated position upon said second valve seat portion of said valve seat member, when said spool valve is disposed at said second extreme position, so as to define a CLOSED position with respect to said second valve seat portion of said valve seat member and thereby prevent the flow of the fluid, through said second space defined between said second valve seat portions of said spool valve and said valve seat member, toward said second fluid passage; and wherein said first and second axially spaced shoulder positions defined upon said valve seat member operatively cooperate in a slidably engaged manner with said first and second axially spaces shoulder portions of said spool valve, for prevention fluidic communication between said first and second fluid passages, even when both of said first and second valve seat portions of said spool valve are unseated from said first and second valve seat portions of said valve seat member as said spool valve is being axially moved in a transitional manner, relative to said valve seat member, between said first and second extreme positions.