Browse Prior Art Database

Three-Way Vacuum/Liquid/Gas Valve

IP.com Disclosure Number: IPCOM000104372D
Original Publication Date: 1993-Apr-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 2 page(s) / 66K

Publishing Venue

IBM

Related People

Kott, G: AUTHOR [+2]

Abstract

This valve is capable of evacuating a cavity, then backfilling the cavity with a degassed liquid, all through one orifice.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 58% of the total text.

Three-Way Vacuum/Liquid/Gas Valve

      This valve is capable of evacuating a cavity, then backfilling
the cavity with a degassed liquid, all through one orifice.

      Transferring a degassed liquid from one container to another,
while keeping the liquid under vacuum, is difficult to do through
must be at a vacuum level equal to or greater than the liquid or
gasses (mostly air and water vapor) will be absorbed by the liquid
from anything that is not adequately outgassed.  And it is hard to
keep a valve properly outgassed because gasses become trapped in the
moving parts of a valve.

      It is relatively easy to make good static seals to hold vacuum.
That is, seals that remain fixed, the mating parts don't move.  But
in valves there are moving seals to make it difficult to keep a good
vacuum seal.  A good method for a vacuum valve seal is a simple
o-ring face seal which works very well for opening and closing one
vacuum line, which is the basis used for this device.

      The Invention consists basically of a vacuum valve with an
inherent liquid feedthrough (see figure).

      The valve case is sealed with all face seals, and the face
seal, used to open and close the working path, is movable due to a
welded steel bellows which can flex in either direction.

      With the valve open (bellows down) the working path of the
valve is used to pull a vacuum.  Once the desired vacuum level is
reached (this particular valve easily gets down to the m...