Control Valve for Vacuum Systems
AssigneeThermwood Corporation
InventorsBrian Scott SMIDDY, Jonathan Fuquay
Life of this patent
Estimating the term…
Abstract
A valve assembly including a housing having first and second ports; a cylinder assembly mounted on such housing having a piston rod displaceable along an axis of such first port, provided with a valve plug including a first component having a passageway therethrough intercommunicable with the interior of such housing and such first port, and a second component supported on and displaceable axially relative to such first component, wherein upon extension of such plug into closing engagement with such first port, such passageway will be obstructed and upon retraction of such plug out of closing engagement with such first port, such passageway will be unobstructed.
Claims15
A valve assembly comprising:
- a housing provided with a first port disposed on an axis and having a peripheral seating surface, and a second port;
- a cylinder assembly including a cylinder mounted on said housing and a piston rod displaceable along said axis;
- and
- a valve plug including a first component having a passageway therethrough intercommunicable with the interior of said housing and said first port, and a second component supported on and displaceable axially relative to said first member,
- wherein upon full extension of said rod, said first component is caused to displace said second component into sealing engagement with said peripheral seating surface of said housing and correspondingly mask a port of said passageway, and upon a limited retraction of said rod from a full extension thereof, said port of said passageway is caused to unmask as said second component remains intact.
A valve plug mountable on the piston rod of a cylinder assembly mounted on a housing provided with a first port communicating with a conduit, having a seating surface relative to the axis of travel of said rod, and a second port disposed between said first port and said cylinder, comprising:
- a first component mounted on said piston rod, provided with a pair of opposed, forwardly and rearwardly facing abutment surfaces, and a passageway including an inlet port disposed in a leading surface thereof communicable with said conduit and an outlet port rearwardly disposed relative to said first port, communicable with said second port;
- and
- a second component mounted on said first component, engageable by said rearward abutment surface of said first component upon extension of said rod to displace said second component into sealing engagement with said seating surface, masking said outlet port of said passageway, and engageable by said forward abutment surface of said first component upon retraction of said rod, to displaced said second component, unmasking said outlet port of said passageway.
Dependencies are inferred from the claim text.