Isolation valve used in a single crystal pulling apparatus

Details Isolation valve used in a single crystal pulling apparatus Isolation valve used in a single crystal pulling apparatus

1990-03-20

1991-06-04

Walton, George L.

Valves and valve actuation

Mechanical movement actuator

Plural motions of valve

251301, 251303, 251333, 251900, F16K 124, F16K 310, F16K 31143

Patent

active

050207750

ABSTRACT:
An isolation valve used in a single crystal pulling apparatus, having a frame (11), a vertical passageway for communication between a main chamber and an upper pull chamber of the single crystal pulling apparatus, a shaft (13) capable of turning about its axis and reciprocating vertically, a lever (20) for turning the shaft, a drive means (18) for reciprocating the shaft (13), an arm (14) fixed to the shaft (13), a circular shutter (15) held by the arm (14) for closing and opening the vertical passageway, and a flange (9) defining a hole which communicates the passageway with the main chamber, wherein a cylindrical cavity is made in the bottom of the circular shutter (15); the flange (9) has a circular raised rim (9b) extending upward whose outer diameter is slightly smaller than the diameter of the cylindrical cavity of the shutter; and an endless circular seal means (17) is embedded partially in either the external vertical wall of the raised rim (9b) of the flange or the internal vertical wall of the shutter (15).

REFERENCES:
patent: 241568 (1881-05-01), Spratt
patent: 786033 (1905-03-01), Herrick
patent: 1197583 (1916-09-01), Sheridan
patent: 1468502 (1923-09-01), Keller
patent: 2782800 (1957-02-01), Hillebrand
patent: 2805836 (1957-09-01), Taylor
patent: 3511475 (1970-05-01), Pfau
patent: 4132386 (1979-01-01), Lee

Affiliated with

Also associated with

Rating

Isolation valve used in a single crystal pulling apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Isolation valve used in a single crystal pulling apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Isolation valve used in a single crystal pulling apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1021618