Steam pressure reducing and conditioning valve

Details Steam pressure reducing and conditioning valve Steam pressure reducing and conditioning valve

2002-01-04

2004-04-06

Hepperle, Stephen M. (Department: 3753)

Fluid handling

Processes

With control of flow by a condition or characteristic of a...

C137S605000

Reexamination Certificate

active

06715505

ABSTRACT:

TECHNICAL FIELD OF THE INVENTION
The present invention concerns a steam pressure and conditioning valve.
RELATED APPLICATION
The present invention includes common subject matter disclosed in U.S. application Ser. No. 10/039,345, entitled Steam Pressure Reducing and Conditioning Valve by the same inventor Hiroyuki Higuchi, filed concurrently on Jan. 4, 2002, the disclosure of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION
Applicant has discovered a further refinement and improvement to the steam pressure reducing and conditioning valve (hereinafter “conditioning valve”) for which he has made application for letters patent in application U.S. Ser. No. 10/039,345 by inventor Hiroyaki Higuchi filed concurrently with this application on Jan. 4, 2002 under.
A first embodiment of the invention as described and claimed in the aforementioned related application may be described as follows.
As illustrated in
FIG. 3
, a first embodiment of the present invention comprises a vapor change valve
18
for passing hot and high pressure steam S inflowing from a first port
1
through a pressure reducing section
2
, and supplying subcooled water W and discharging desuperheated and depressurized steam S
2
from a second port
3
. One or more nozzles
4
for supplying subcooled water W are provided in proximity to said pressure reducing section
2
. A flat nozzle
4
a
injects subcooled water W in a planar pattern r. Nozzle
4
is positioned so that there is a predetermined distance L between the jet pattern r of subcooled water W injected from flat nozzle
4
a
and the pressure reducing section
2
. In the first embodiment, conditioning valve
18
includes a pressure reducing section
2
with a bottom and a cylindrical shape. The subcooled water W jet pattern r is selected to be substantially parallel to the bottom of the pressure reducing section
2
. It will be understood by those skilled in the art that one or more of nozzles
4
for injecting moisture W may be juxtaposed in several stages in the a moisture supply section
5
of valve
18
. The nozzle
4
disposed in the position nearest to the pressure reducing section
2
is a flat nozzle
4
a
. Other nozzles
4
disposed further away from the pressure reducing section
2
may have jet patterns of either planar or conical.
Applicant has tested the first embodiment of the conditioning valve as illustrated in FIG.
3
and determined the following limitations:
First, as shown in
FIG. 4
, the vapor discharge area
19
has an annular shape narrow in width L
1
. Consequently, during the collision of outflow vapor S
1
with the sub cooled water mist W, a part of subcooled water mist W crosses the moisture supply section
5
, and impinges against the opposite side wall face
5
a
and liquefies (condenses), reducing the effective amount of subcooled water mist W to be contacted by the steam S
1
flow.
Second, as shown in
FIG. 4
, the vapor discharge area
19
is near the wall face
5
a
of the body
6
. The collision with the subcooled water mist W tends to occur in the vicinity of the wall face
5
a.
As the result, a part of chilled water mist W is directed back to the proximal side wall face
5
a
and liquefied (condensed), so the subcooled water mist W does not work as effectively as it might.


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