Ppt LLC

Stanley P Przybylski, Sr

An apparatus for performing various machining operations on the interior surface areas of a large steam valve or the like which includes a value seat ring with a valve seat thereon secured to a valve seat ring step interiorly of the valve body. The apparatus includes a support plate fixedly secured to the open end of the valve body, a drive tube rotatably and axially supported from the support plate, a spider assembly mounted on the inner end of the drive tube and including radially expandable and retractable jaws or centering members for engaging the interior of the valve body to stabilize and support the rotatable drive tube and orient the drive tube concentric with the valve seat or other interior surface areas to be machined. Axial movement of the drive tube is obtained by a lockable rack gear and pinion gear assembly while rotation of the drive tube is accomplished by a worm gear drive arrangement mounted on the support plate and engaged with a bushing connected to the drive tube. The inner end of the drive tube includes a tool assembly including a cross-slide feed, a slide and tool adapter with the slide feed being finely adjustable from the outer end of the drive tube and the axial position of the tool adapter and tool also being finely adjusted from externally of the drive tube at the outer end thereof thereby providing both a rough axial adjustment, a fine axial adjustment and a fine lateral or radial adjustment of the tool adapter and tool so that the tool can be moved in a circular path having a center coincident with the center of the valve body.

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Lanoka Harbor, NJ, United States of America

Stanley P Przybylski, Sr