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Патент USA US3095016

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June 25, 1963
s. s. SMITH
3,095,006
VARIABLE FLOW RESTRICTION DEVICE
Filed Dec. 8, 1961
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United ‘States Patent 0.
Patented June 25, 1963
1
2
3,095,006
either of the seats depending upon which side of the valve
element the spring is located. As can be seen from the
VARIABLE FLOW RESTRICTION DEVICE
.Sydney S. Smith, Scarsdale, N.Y., assign‘or to Smith De
drawing, when the valve is in the position shown, ?uid
velopment (10., Pebble Beach, Calif., a corporatien of
California
Filed Dec. 8, 1961, Ser. No. 158,095
9 Claims. (Cl. 137-2695)
can ?ow from the port 54 through the passage 36 and
out port 52. There will be no ?ow from port 52 down
through passage 36 and out port 54-. However, by re
The invention is illustrated diagrammatically in the
tween the crest of the thread 70 and the root of the thread
72. These two spaces are indicated at 74 and 76. The
spaces 74 and '76 are isolated one from the other because
versing the relative positions of the spring 68 and the
valve element 66 there can be substantially unrestricted
This invention relates to a ?uid variable ?ow restriction
?ow in the opposite direction. The plug 58 is removable
device.
10 in order that the direction of unrestricted ?ow can be
A primary purpose of the invention is to provide a
reversed.
variable ?ow restriction device which permits generally
The outer surface of the plug 34 may have a suitable
unregulated ?ow in one direction, and a smaller, regu
thread 76, which is preferably a square thread. In like
lated ?ow in the opposite direction.
manner, the inner surface of the cylinder 12 has a square
:Another purpose is a variable ?ow restriction device 15 thread '72.’ Both the plug and the cylinder 12 are tapered
‘which can be adapted for numerous ?uid measuring and
and the threads 70 and '72 are generally identical. In this
for throttling operations.
way when the plug is in the completely closed position, as
Another purpose is a device of the type described which
in FIGURE 1, the threads will be completely in mesh.
provides precisely controlled ?uid ?ow in one direction.
On the other hand, when the plug 34 is not completely
Other purposes will appear in the ensuing speci?cation, 20 within the body 10 there will be space between the crest
vdrawings and claims.
of the thread 72 and the root of the thread 70 and be
following drawings wherein:
\FIGURE 1 is an axial section through the ?ow device
of this invention in the closed position,
25 the sides of the threads 70 and 72 ?t tightly together.
‘.FIGURE 2 is an axial section, similar to FIGURE 1,
The spaces 74 and 76 de?ne a pair of generally parallel
showing the device in an open position, and
helical ?ow passages that run from the chamber 42 down
FIGURE 3 is an enlarged section showing the details
.to the port 54. The ?ow passages are annular and uni
of the ?ow passages when the device is in an open position.
formly extend in an axial direction. The cross sectional
The generally cylindrical body 10 includes a central 30. area of the flow passages or spaces 74 and 76 may be
‘cylinder 12 having end ?anges 14 and 16. One end of , Varied by moving the plug relative to the body 10. As
the body 10 may be closed by a cap 18 having a ?ange
the plug is moved deeper into the body the spaces 74 and
,24) which is secured to the ?ange 16 by suitable threaded
/'76 will decrease in size and the ?ow of ?uid will be
bolts or the like 22. The other end of the body may have
more restricted. As the plug 34 is moved upward of the
.a cover 24 having an annular ?ange 26 which is secured 35 body 10 the size of the spaces 74 and 76 will be increased
‘ to the ?ange 14- by suitable threaded bolts or the like 23.
and the ?ow of ?uid will similarlybe increased. The
An O-ring 3-0 may seal the ?anges 26 and 14 and an
?ow passages 74 and 76 have a uniform cross section
O-ring 32 may seal the ?anges 16 and 20.
throughout as the threads 71} and, 72 are uniform. When
Mounted within the body 19 is a plug 34 having an
. the plug 34 is in the completely closed position, an O-ring
axial generally central flow passage 36 which extends com
pletely through the plug. Suitably attached to the upper
end of the plug is a shaft or the like 33 which has a ?ow
‘passage 40 in communication with the passage 36 and
opening into a chamber 4-2 formed within the cover mem
73 will form a seal between the plug and the cap 18. The
?ow passages 74 and 76 are arranged to control the ?ow
_ of ?uid in either direction and it is only the size of the
passages that restricts and controls the ?ow of ?uid.
The use, operation and function of the invention are
ber 24 and above the plug. The shaft 33 may be ?xed 45‘ as follows:
‘to the plug and is adapted to rotate the plug to thereby '
The restrictive ?ow device shown is effective to pre
vary the restricted ‘?ow passage hereinafter described.
cisely regulate the ?ow of ?uid in one direction through
The shaft 355 passes through a sleeve 44, which may be
a pair of parallel and annular ?ow passages which extend
integral with the cover 24, and has a suitablehand wheel
in a helical manner from ‘an inlet port toward an outlet
, or the like 46 ?xed at its upper end. An O-ring 48 may 50 port. The size of the ?ow passages and hencethe volume
‘seal the‘ upper end of the shaft 38 and the sleeve 44.
Fixed along one side of the sleeve 44 and attached to
the hand wheel 46 is a suitable indicator 50 which may
be calibrated in any desired manner to indicate the volume
of ?ow can be precisely controlled by moving the plug
34 either into or out of the body 10. At low pressures
the ?ow through the passages 74 and “76 will be generally
laminar whereas at high pressures there will be a turbulent
?ow. Any type of liquid or gas which has a ?ow char
acteristic that can be regulated can ‘be passed through
A port 52 in the cover 24 may function either as an
the ?ow restriction device shown with excellent results.
inlet port or an outlet port, depending upon the direction
Preferably the threads on the plug and cylinder 12 are
of ?ow, and is in communication with the chamber 42 and
square. What is essential is that the threads de?ne ‘an
hence the ?ow passage 36. The cap 18 has a port 54 60 annular flow passage. As shown herein, with square
which also may be either an inlet port or an outlet port
threads there are two annular ?ow passages. Other
and which is in communication with the lower end of the
thread formations may be satisfactory if they provide
flow passage 36 through a check rvalve hereinafter de
for control of the cross sectional area of the ?ow passage.
of ?uid ?owing through the restrictive ?ow passage here
inafter described.
scribed.
For example, the conventional screw thread having in
At the lower end of the ?ow passage 36 is an enlarged 65 clined side surfaces would not be satisfactory, as the
chamber 56, the lower end of the chamber being closed
thread would either completely stop the ?ow or would let
by a plug 58 which has a passage 60 generally the same
a substantially unregulated amount of ?uid ?ow axially
in cross section as the passage 36. The plug 58 may be
through the space between the threads.
suitably screwed into the bottom of the plug 34. The
The invention has particular application in an arrange
opposite ends of the chamber 56 have valve seats 62 and 70 ment where substantially unrestricted ?ow is desired in
64 which are adapted to seat a ball valve 66. A coil
one direction and a limited amount of restricted and
spring or the like 68 biases the valve element 66 against
controlled flow is desired in the other direction. ‘For
3,095,006
3
example, considering the form of the invention shown in
the drawings, substantially unregulated ?ow will be per
mitted from port 54 past the valve element 66, through
4. The structure of claim 3 further characterized by an
axial ?ow passage in said plug from the inlet to the outlet,
said axial ?ow passage being substantially larger in cross
device may also be used as a ?ow meter, without a check
sectional area than either of said helical ?ow passages,
and check valve means in said‘ ‘axial ?ow passage per
mitted ?ow in only one direction.
5. The structure of claim 3 further characterized in
that the threads on said plug and body are generally
square in cross section, with the two ?ow passages being
at the crest and root of the threads.
6. A ?uid variable ?ow restriction device including an
shown and described herein, it should be realized that
in said plug connecting the inlet to the outlet and check
passage 36, into the chamber \42 and then out port 52.
The only flow in the opposite direction would be that
permitted by the flow passages 74 and '76. As mentioned
above, the valve element 66- may be reversed so that the
unrestricted ?ow is in the opposite direction.
The invention has numerous applications as a throttling
device to control the ?ow of r?uid in one direction. The
outer generally cylindrical body and a generally cylindri
valve and central passage, if the pressure drop across the
cal plug
the body, said body having an inlet and
device is known. The device as shown in the drawings
an outlet axially spaced therefrom, vthe outer surface of
has particular application in pipelines, in which it con
trols the flow from fuel racks on diesel engines which 15 the plug and the inner surface of the body being tapered
‘and each having mated square-threaded areas which de
are operating centrifugal pumps. The device shown may
?ne two separate and generally parallel helical ?ow paths
also control valves which throttle pump stations on pipe
from the inlet to the outlet, one path being at the root
lines or the like.
of the threads and the other being at the crest, relative
The device shown and described is a particularly ac
curate flow meter or flow restriction device because of 20 movement between said plug and body being effective to
vary the cross sectional area of said flow paths with said
the long ?ow conduit. A long conduit of small size is
paths being completely shut off when the plug is com
much more reliable and ‘accurate than a short restriction.
pletely received within the body, an axial flow pasage
Whereas the preferred form of the invention has ‘been
'there are many modi?cations, substitutions and alterations 25 valve means in said axial flow passage effective to permit
?ow in only one direction.
thereto within the scope of the following claims.
7. The structure of claim 6 further characterized by
I claim:
an enlarged chamber in said axial flow passage, a valve
1. A ?uid variable ?ow restriction device including an
member in said chamber, and means normally biasing
outer generally cylindrical body and a generally cylin
drical plug within the body, said body having an inlet 30 said valve member against one end of said chamber to
and an outlet axially spaced therefrom, the outer surface
of the plug and the inner surface of the body having
thereby block fiow in ‘one direction.
8. The structure of claim 7 further characterized by a
an annular direction toward the outlet, movement of
member will close said passage at one or the other se
valve seat at each end of said chamber and surrounding
mated surfaces that de?ne a pair of parallel generally
the entrances of said axial flow pasage into said cham
helical restricted annular ?ow paths, each generally uni
form in cross section, said ?ow paths being in communi 35 ber, and means permitting reversal of positions of said
valve member and biasing means wherebysaid valve
cation with said inlet and being directed uniformly and in
lected end of said valve chamber.
9. The structure of claim 7 further characterized in
2. The structure of claim 1 further characterized by 40 that the means normally biasing said valve member in
cludes a coil spring positioned in said chamber.
an axial ?ow path vfrom the inlet to the outlet substan~
tially larger in cross sectional area than either of said
generally helical ‘flow paths, and check valve means in
References Cited in the ?le of this patent
said axial flow path permitting flow in only one direction.
UNITED STATES PATENTS
3. A ?uid variable ?ow restriction device including an 45
said plug relative to said body being effective to change
the cross sectional area of said ?ow paths.
outer generally cylindrical body and a generally cylindri—
1,957,829
Greenwatld ____________ __ May 8, 1934
2,030,251
2,091,764
Greener ___-_ _________ _._ Feb. 11, 1936
‘Martin _______ _'_ _____ __ Aug. 31, 1937
and each having mated threaded areas, the space between 50' 2,323,115
vBryant ______________ __ June 28, 1943
cal plug within the body, said body having an inlet and
an outlet axially spaced therefrom, the outer surface of
the plug and the inner surface of the body being tapered
the threads de?ning two separate and parallel generally
helical ?ow paths in communication with the inlet and
outlet and extending uniformly in an axial direction,
movement of said plug relative to» said body being effec
tive to vary the cross sectional area of said ?ow paths.
FOREIGN PATENTS
405,574
484,369
Great Britain ________ __ Feb. 8, 1934
Great Britain _________ __ May 4, 1938
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