Fluid handling – With leakage or drip collecting
Patent
1997-04-16
1999-07-20
Michalsky, Gerald A.
Fluid handling
With leakage or drip collecting
1376255, 13762566, 2513352, F16K 11048
Patent
active
059244410
ABSTRACT:
The invention comprises a three-way diaphragm valve. The valve has a housing having three flow ducts each leading into an open interior chamber. The open interior chamber is divided into a central chamber, an upper chamber and a lower chamber. A first valve seat is positioned between the central chamber and the upper chamber. A second valve seat is positioned between the central chamber and the lower chamber. A central valve stem assembly is slidably mounted in the valve and has a first valve member and a second valve member positioned to alternately engage the first valve seat and second valve seat respectively, to direct flow from one passageway to another. A spring bears against the valve stem assembly to bias the relative position of the valve members and valve seats in a first predetermined position. An actuator comprising a piston is slidably mounted in a piston chamber and attached to the valve stem assembly to overcome the force of the spring and move the valve stem assembly into a second actuated position. The piston may be moved by pressurized air or hydraulic fluid to automatically actuate the valve into the second actuated position. Diaphragms are integrally formed on each valve member and attached to the valve body to form a barrier or outside walls of the open interior chamber to prevent fluid from leaking from the valve. An additional diaphragm may provide secondary containment of the spring to provide additional protection against contamination of the process fluid.
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Leys John A.
Stein Michael A.
Fluoroware, Inc.
Michalsky Gerald A.
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