Fluid handling – With indicator – register – recorder – alarm or inspection means
Statutory Invention Registration
1996-09-09
2001-06-05
Tudor, Harold J. (Department: 3641)
Fluid handling
With indicator, register, recorder, alarm or inspection means
C137S595000, C137S607000
Statutory Invention Registration
active
H0001962
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention pertains generally to a valve and more particularly to a fast valve capable of ejecting a plurality of gases, simultaneously.
2. Description of the Related Art
In operations, such as the production of a dense plasma, gas is injected into a chamber. In this type of operation, as well as many others, there is a need for a valve to deliver a puff of gas within a short period. A delay between the valve opening the operation may cause the operation to be unsuccessful.
Currently, a typical valve for use in plasma production operates through the use of diamagnetic repulsion, has only one gas chamber and, therefore, operates with only one gas or gas mixture at a time. This type of valve
10
is shown in
FIG. 1
and operates by discharging a capacitor (not shown) into a coil
12
thereby creating a magnetic field that repels an aluminum ring
14
which rests above the coil
12
. The ring
14
is allowed to accelerate through a predetermined distance, thereby achieving a large velocity before striking a nylon poppet
16
. The poppet
16
is then driven off an O-ring
17
, opening the valve
10
and permitting a gas to flow through the gas inlet
18
and out the gas outlet
19
. Use of this two stage process of valve opening reduces the rise time when compared with designs using magnetic forces to open the valve directly. Compare, Simple, fast, puff valve, Rev. Sci. Instrum. 62 (10), pp. 2372-2374, Oct. 91; U.S. Pat. No. 4,771,447, Saitoh et al., 1988; Kriesel et al., and Wong et al., Balanced puff valve for imploding gas-puff experiments, Rev. Sci. Instrum, 57(8), pp. 1684-1686, Aug. 86. Some experiments require the use of two gases, therefore, two, separate, independently working fast valves are required to provide concentric gas streams. See, Finken et al.,
The Gas
-
Liner Pinch—A New Spectroscopic Light Source
, Phy. Ltrs. Vol. 85A, No. 5, pp. 278-280, Oct. 81. However, the use of two valves creates problems with gas rise times which is dependent upon the length that a gas has to travel downstream of the valve. In a two-valve system, one valve has to be displaced farther back or to the side of the other and this requires long flow tubes which in turn causes the gas rise time to be longer. A longer gas rise time allows the gas to diffuse with the other gas or into the chamber and cause electrical breakdown.
SUMMARY OF THE INVENTION
The object of this invention is to provide a valve capable of ejecting a plurality of gases, simultaneously, into an a chamber.
This and other objectives are accomplished by the use of a valve having a plurality of plenum chambers for the storage of several gases under pressure. A poppet within the valve is displaced by an electromagnetic force thereby allowing the plurality of gases to be ejected, simultaneously, from the plenum chambers into a region of lower pressure.
REFERENCES:
patent: 1257070 (1918-02-01), Discher
patent: 2181156 (1939-11-01), Schmidt
patent: 3361045 (1968-01-01), Oertel et al.
patent: 3760225 (1973-09-01), Ehlers et al.
patent: 4063096 (1977-12-01), Roberts
patent: 4223698 (1980-09-01), Reinicke
patent: 4635282 (1987-01-01), Okada et al.
patent: 4707983 (1987-11-01), Gillon
patent: 4771447 (1988-09-01), Saitoh et al.
Kriesel et al.; Simple, Fast, Puff valve; Rev. Sci. Instrum. 62(10) pp. 2372-2374; Oct. 91.
Wong et al.; Balanced Puff valve for imploding gas-puff experiments; Rev. Sci, lastrum 7(8); pp. 1684-1686; Aug. 86.
Finken et al.; The Gas—Liner Pinch—A New Spectro Scopic Light Source; Phy. Ltrs. vol. 85S, No. 5; pp. 278-280; Oct. 81.
Fisher et al.; Fast Valve for Gas injection into Vacuum; Rev Sci Instrum. 49(b); pp. 872-873; Jun. 78.
Fisher Amnon
Peterson Gus G.
Edelberg Barry A.
Stockstill Charles J.
The United States of America as represented by the Secretary of
Tudor Harold J.
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