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Title: Double-disc gate valve

Abstract

This invention relates to an improvement in a conventional double-disc gate valve having a vertically movable gate assembly including a wedge, spreaders slidably engaged therewtih, a valve disc carried by the spreaders. When the gate assembly is lowered to a selected point in the valve casing, the valve discs are moved transversely outward to close inlet and outlet ports in the casing. The valve includes hold-down means for guiding the disc-and-spreader assemblies as they are moved transversely outward and inward. If such valves are operated at relatively high differential pressures, they sometimes jam during opening. Such jamming has been a problem for many years in gate valves used in gaseous diffusion plants for the separtion of uranium isotopes. The invention is based on the finding that the above-mentioned jamming results when the outlet disc tilts about its horizontal axis in a certain way during opening of the valve. In accordance with the invention, tilting of the outlet disc is maintained at a tolerable value by providing the disc with a rigid downwardly extending member and by providing the casing with a stop for limiting inward arcuate movement of the member to a preselected value during opening of the valve.

Inventors:
 [1]
  1. (Oak Ridge, TN)
Issue Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
OSTI Identifier:
863258
Patent Number(s):
4134571
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
double-disc; gate; valve; relates; improvement; conventional; vertically; movable; assembly; including; wedge; spreaders; slidably; engaged; therewtih; disc; carried; lowered; selected; casing; discs; moved; transversely; outward; close; inlet; outlet; ports; hold-down; means; guiding; disc-and-spreader; assemblies; inward; valves; operated; relatively; differential; pressures; sometimes; jam; jamming; gaseous; diffusion; plants; separtion; uranium; isotopes; based; finding; above-mentioned; results; tilts; horizontal; axis; accordance; tilting; maintained; tolerable; value; providing; rigid; downwardly; extending; stop; limiting; arcuate; movement; preselected; valve disc; outlet ports; downwardly extending; differential pressure; assembly including; preselected value; gaseous diffusion; gate valve; valve discs; slidably engage; valve casing; vertically movable; horizontal axis; double-disc gate; slidably engaged; gate valves; selected value; diffusion plant; /251/

Citation Formats

Wheatley, Seth J. Double-disc gate valve. United States: N. p., 1979. Web.
Wheatley, Seth J. Double-disc gate valve. United States.
Wheatley, Seth J. Mon . "Double-disc gate valve". United States. https://www.osti.gov/servlets/purl/863258.
@article{osti_863258,
title = {Double-disc gate valve},
author = {Wheatley, Seth J.},
abstractNote = {This invention relates to an improvement in a conventional double-disc gate valve having a vertically movable gate assembly including a wedge, spreaders slidably engaged therewtih, a valve disc carried by the spreaders. When the gate assembly is lowered to a selected point in the valve casing, the valve discs are moved transversely outward to close inlet and outlet ports in the casing. The valve includes hold-down means for guiding the disc-and-spreader assemblies as they are moved transversely outward and inward. If such valves are operated at relatively high differential pressures, they sometimes jam during opening. Such jamming has been a problem for many years in gate valves used in gaseous diffusion plants for the separtion of uranium isotopes. The invention is based on the finding that the above-mentioned jamming results when the outlet disc tilts about its horizontal axis in a certain way during opening of the valve. In accordance with the invention, tilting of the outlet disc is maintained at a tolerable value by providing the disc with a rigid downwardly extending member and by providing the casing with a stop for limiting inward arcuate movement of the member to a preselected value during opening of the valve.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1979},
month = {1}
}

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