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US 4,397,505 AGranted
Control valve
AssigneeKelsey-Hayes Company
InventorHerbert L. Linkner, Jr.
Life of this patent
Estimating the term…
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AssigneeKelsey-Hayes Company
InventorHerbert L. Linkner, Jr.
Estimating the term…
Pneumatic valve construction comprising a valve chamber having opposing inlet ports with opposing axially located valve seats, and a ball therebetween constructed and arranged to move off of one valve seat into engagement with the other valve seat upon an unbalance in pressure. The construction includes a bottom outlet port that extends to the top of another larger cylindrical chamber having an elastomeric piston therein with fluid flow clearance between the piston and the side walls of the chamber. A tubular exhaust port extends axially inwardly from the bottom side of the chamber to abut the bottom side of the rubber piston. An annular fluid flow chamber exists between the tubular exhaust seat and the side walls of the cylindrical chamber to allow flow past the piston through the space to a delivery port. The rubber piston includes a conically shaped lip which extends out into engagement with the side walls of the cylindrical chamber to help center the piston in the cylinder and to prevent reverse flow from the outlet port back to the inlet ports.
A backpressure valve for maintaining a pressure on an outlet port equal to or greater than that at an inlet port comprising:
A valve piston comprising:
A backpressure valve for vehicular air braking systems and the like comprising a valve body having a first cylindrical chamber opening outwardly thereof, an annular plug in the outer end of said chamber, said annular plug having an axially extending inner tubular projection spaced from the sidewalls of said cylindrical chamber to form an annular outlet chamber, said tubular projection having an annular exhaust valve seat on its inner end, a valve piston in said cylindrical chamber inwardly of said annular valve seat and having a main body portion with fluid flow clearance between itself and the sidewalls of said chamber, an annular flexible skirt depending angularly outwardly from said main body portion into engagement with the sidewalls of said cylindrical chamber to form a one way seal therewith against flow from said outlet chamber past said valve piston, a second chamber extending through said valve body with a control port at one end and a supply port at the other end, valve means in said second chamber functioning to close off whichever port has the lowest pressure, and means communicating whichever port is open to the side of said piston opposite from said exhaust valves seat, thereby allowing the highest pressure of said supply or control port to be directly communicated to said outlet chamber, and means for moving said piston off of the exhaust valve seat when the pressure in said supply or control port decreases to a predetermined fraction of the pressure in said outlet chamber, thereby allowing flow exhaust to the atmosphere through said tubular projection and through said annular plug.
Dependencies are inferred from the claim text.