Apparatus and method for machining seats of gate valves

Cutting by use of rotating axially moving tool – Processes – Bit detachable

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408 79, 408 835, B23B 3500, B23B 4100

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active

054294568

ABSTRACT:
Apparatus for machining the annular valve seats of a gate valve has a cradle which slides on and wedges outward against the confronting gate guide rails in the valve chamber to lock the cradle in place between the valve seats. A large gear is mounted on one side of the cradle for rotation by a hydraulic motor about an axis generally aligned with the axis of the facing valve seat through adjustment of a pair of leveling screws. A carriage is driven axially on guide rods projecting from the gear adjacent the periphery thereof by a servo motor mounted in the plane of the gear. A tool carrier is reciprocated radially on slides on the carriage by a lead screw motor mounted on the carriage. When machining of one valve face is completed, the cradle is unlocked, lifted off the guide rails, rotated 180.degree. about a vertical axis and reinstalled on the guide rails for machining of the other valve seat.

REFERENCES:
patent: 4114483 (1978-09-01), Grimsley
patent: 4175471 (1979-11-01), Wilger et al.
patent: 4241623 (1980-12-01), Wilger et al.
patent: 4468158 (1984-08-01), Pearce et al.
patent: 4580931 (1986-04-01), Wilger et al.
patent: 4842452 (1989-06-01), Strait
patent: 5125299 (1992-06-01), Strait

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