Mac Valves, Inc.

Walter J Bowman

James A Neff

Richard A Fagerlie

A four-way directional control air valve having a valve body in which is formed a valve spool bore having a valve spool movably mounted therein. The valve spool bore has a pair of longitudinally spaced apart air supply chambers formed in the wall thereof. An exhaust chamber is formed in the wall of the valve spool bore in a longitudinal central position between the pair of air supply chambers. A first cylindrical chamber is formed in the wall of the valve spool bore in an intermediate position between the exhaust chamber and one of said air supply chambers. A second cylinder chamber is formed in an intermediate position in the wall of the valve spool bore between an exhaust chamber and the other air supply chamber. The valve spool has a pressurized air flow chamber formed therethrough, and it is connected to the air supply chambers formed in the valve spool bore to provide an air supply flow path through the valve spool. The valve spool is adapted to be moved to a first positon to connect one of the air supply chambers to the first cylinder chamber and the exhaust chamber to the second cylinder chamber, and to a second positon to connect the other air supply chamber to the second cylinder chamber and the exhaust chamber to the first cylinder chamber. In one embodiment, the valve spool is shifted in one direction by pilot air or a spring means to a first position, and by pilot air in the other directon to a second position. In another embodiment, the valve spool is shifted to first and second positions by pilot air, and to a third neutral position by a spring or a spring with air assist means mounted in the air flow chamber in the valve spool.

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Detroit, MI, United States of America

Walter J Bowman