Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1991-11-14
1993-05-18
Rivell, John
Fluid handling
Line condition change responsive valves
Direct response valves
F16K 2102
Patent
active
052111920
ABSTRACT:
Apparatus and method are disclosed by which a pent up supply of compressed air in a pneumatic supply line is slowly bled off after the line is disconnected from its air supply source. The apparatus and method are well adapted for use in pneumatic tool lines. The invention includes a housing which may be inserted in a line attached to a supply of high pressure air, such as a pneumatic line. Flow restriction means are contained in a passageway within the housing for permitting the relatively free flow of pressurized air in one direction, such as is needed to operate a pneumatic tool, and for partially restricting the flow of air in the opposite direction once the line has been disconnected from its supply source. The flow restriction means incorporate a movable member which allows air to freely flow around it when the line is operating a tool, but allows only limited air flow in the opposite direction when the moveable member is forced against a seat, thus gradually, rather than immediately, releasing compressed air trapped in the line to avoid fishtailing of the line.
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patent: 5004010 (1991-04-01), Huet
Goar Keith J.
Rivell John
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