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Патент USA US2133983

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Oct. 25, 1938.
A. D. GASTON
2,133,983
_
VALVE
Filed Aug. 26,- 1956
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INVENTOR._
Oct. 25, 1938.
2,133,983
A. D. GASTON
VALVE
Filed Aug. 26, 1936
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Oct. 25,- 1938.
A. D. GASTON
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2,133,983
VALVE
Filed Aug. 26, 1936
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INVENTOR.
2,133,983
Patented Oct; 25, .1938
UNITED STATES2,133,983PATENT- OFFICE
VALVE
Audley D. Gaston, IBaytown, Tex.
_Application August 26, 1936, Serial No.,98,051
(CI. 137-139)
of illustration only, it being understood that
18 Claims.
This invention concerns valves for the control
either type of end connection may be used with
either type of stem.
of the ?ow of ?uids in piping systems, and is
intended to provide a valve for general indus
trial service, so arranged that the valve may be
‘ The corresponding parts in all views of the '
drawings bear identical reference numbers. ,
5 conveniently and economically lined throughout
Referring now to the several ?gures, part 2
the ?uid passageway with suitable corrosion and,
or, erosion resisting metals or alloys, the con
is a valve body or housing provided with a boss
22, and ?anges I or conically tapered threads 4,
‘said body 2 being suitably machined to receive
struction' being preferably adapted to permit the
introduction of the proper type of lubricant back
10 of the parts comprisirg the lining to further
and retain the various component parts. Part 10
segregate and protect the ‘body and operating
‘I is an inlet bushing or tubular member of cor
parts from the harmful effects of the ?uid being
handled, and to accomplish this purpose with
the least possible turbulence in the ?owing
l5 stream and therefore the least possible loss of
rosion and, or, erosion ‘resisting material, pro
‘
vided with a seat 6, threads 5 and bearing 9. Part
I1 is an outlet bushing or tubular member, sim
ilarly of corrosion and, or, erosion resisting ma 15
terial provided with a bearing l6. Parts ‘I and I1,
the inlet and outlet bushings respectively will be
head, the valve being conveniently arranged for
manual operation and control.
,
machined and ?tted as shown in Fig. 1 or Fig. 3
Thus, among the ultimate objects of this in
vention is to provide a valve for general use
20 which shall have a greatly increased life in serv- ‘
ices handling ?uids of a more or less corrosive
or chemically active nature, or which may be.
depending upon the type of end connection de
sired. In the ?anged design as shown in Fig. 1 20
parts 1 and I1 are provided with lugs 49 and
?at headmachine screws 50 to secure them in
place in body 2,'whereas in_ the screw end de
abrasive due to extremely high velocities or be
cause they carry particles of hard substance or ' sign shown in Fig. 3 parts 1 and I1 are secured
and made tight in body 2 by means’. of conically 25
tapered threads 4. Lugs 49 and ?at head ma
chine screws 50 are not necessarily intended to
have sufficient ‘strength to compress gaskets 3’
and I 8 to complete closure of the joint between "
bushings I and I1 and body 2, chief reliance in 30
this, respect being placed in the customary com
panion ?anges and bolts by, means of ‘which the
26 substances tending to cut or erode parts con
tacted at intermediate velocities, or in services
handling ?uids which may combine these cor
rosive and erosive characteristics, and to accom—
plish the desired increase in life with small by
30 draulic losses, all of which is brought out more
particularly and in detail in the description
hereinafter given of several embodiments of the
valve is installed’in- the piping system. Part 8
invention illustrated in the accompanying draw
ings, in which drawings
is a cage or sleeve, or tubular body, also of suit‘
able corrosion and, or, erosion resisting material, 35
provided with internal ribs l I, which in turn sup
port internal hub 14. Cage 8, ribs ll andhub It
may be cast in one. integral part or may be sepa
'
Fig. 1 shows a valve, embodying the features
and objects" of. this invention in sectional ele
vation, the section being taken along the longi
tudinal center line of the valve.
Fig. 2 is a sectional elevation of the same valve
40 as shown in Fig. l, the section being taken nor
mal to the center line of the valve and through
rately provided and assembled by welding or,
other means, but in‘ any event they are prefer
ably of a suitable corrosion and,_or erosion re
sis‘ting material. Part 8 is machined to provide.
threads 5, meshing with corresponding threads
the center of the operating mechanism.
- Figs. 1 and 2 show‘a valve having ?anged end
45 connections and rising stem.
.
on part ‘I, helical gear teeth l5, meshing with a 45
companion helix on solid stem 20, and'bearing
,
Fig. 3 is a similar view to Fig. 1 except that it
illustrates a valve having screwed ends and non
~ rising .stem.
'
Fig. 4 is a sectional elevation of the' valve shown
in Fig. 3, the section being taken normal to the
center line of the valve and through the center
of the operating mechanism.
'
>
40
_
surfaces at 9 and I6 whereguiding bearings are
respectively provided on inlet bushing ‘I and
outlet bushing IT. The hub I‘ is machined and
provided with threads 5| to receive and retain 50
' valve bolt l3. Disc I0 is fastened to bolt [3,»
by means of the retaining nut l2. Bolt I3 is'
screwed into threads 5| in the hub I 4 by means
The combination of ?angedfend connections
with rising stem and of screwed end connection ,of screw driver slot in its end and locked in
position by lock nut l9- which is also provided 55
55 with non-rising stem were selected for purposes ~
2
2,188,988
with screw driver slot. Disc l8, bolt l3, retaining
nut l2 and lock nut l8 are also to be of suitable
corrosion and, or, erosion resisting material,
thus providing a passageway in which all parts
that are contacted by the moving ?uid are of
materials especially suited to give long life in the
particular service.
Moreover disc l8, hub 14 and lock nut l9 are
so shaped as to provide, when assembled, a con
10 tour commonly known as streamlined, which, in
combination with the carefully proportioned
annular passageway between parts l8, I4 and I8,
as assembled, and cage 8, forms a fluid passage
way through the valve which causes the least
15 possible turbulence, the least possible deviation
of the fluid particles from a straight line, and
the least possible velocity changes, thus reducing
hydraulic losses to a minimum.
The annular space between cage 8 in combina
20 tion with inlet bushing 1 and outlet bushing l1,
which will be made of suitable corrosion and. or
erosion resisting material and which form a pro
tective lining throughout the length of the ?uid
passageway, and body 2 is advantageously ?lled
25 with a suitable grease or lubricant not only to
facilitate the operation of the valve but also to
serve as additional means for protectingbody 2
and external operating parts against any harmful
eifects arising from or owing to the nature of the
fluid being handled by the valve and the piping
system in which it is used. A suitable grease or
lubricant applied to the surface of a metal or
‘ alloy and so located that it cannot be readily re
moved by dissolution or washing away is in itself
an excellent protection against corrosion and it is
one of the purposes of this invention to provide the
annular space above mentioned and suitable
means for replenishing the lubricant from time
to time, which means will be described in further .
detail later.
-
The cage 8 together with its integral parts II
and I4, and the removable parts I8, l2, l3 and
I8, constitute a revolving, endwise movable mem
ber under control of the handwheel 28 through
45 valve stem 28 and helical gear thereon. It will be
evident upon referring to the several ?gures, that
turning handwheel 28 rotates cage 8 on bearings
8 and I8, bymeans of helical gear I5 and valve
stem companion helix, thus‘ bringing into play
rotation of handwheel 28 causes cage 8 to move
to the open position, shoulder 52 on outlet bushing
l1 being provided as a stop to limit the opening
movement to the full open position beyond which
no further gain in flow can be expected. Any
further counterclockwise rotation of handwheel
28 will lift valve stem 28 until its shoulder con
tacts shoulder 26 forming an auxiliary seal under
packing 21. Since both in the case of screw
threads 5 and helical gear I5 the tangent of the 10
helix' angle is less than the coeil‘lcient of friction
valve stem 28 is locked with its shoulder tightly
closed against shoulder 26 on bonnet 24 and pack
ing 21 may be safely'removed for renewal while
the valve is in service and wide open under full 15
pressure. In this design handwheel 28 is mounted
on solid valve stem 28 and secured in the usual
’manner by means of a key, washer and nut.
In Figures 1 and 2 illustrating the rising stem
design, the valve stem is divided into two parts, 20
solid stem 28 and hollow stem 31, which are keyed.
together by means of sliding key 34 and keyways
provided therefor. Bonnet 24 is provided with in
ternal threads 25 and machined shoulder 26, and
the hollow stem 31 is provided with companion 25'
threads and shoulder, so that upon clockwise ro
tation of handwheel 28 the hollow ‘stem 31 moves
down and upon counterclockwise rotation moves
up, the upward movement being stopped upon
contact of the shoulder on the stem with shoulder 30
26, when the valve is in the wide open position.
Contact of shoulder on the stem with shoulder
26 forms an auxiliary seal under packing 21 mak
ing it possible to remove gland'follower 33 and
gland 32 and renew packing 21 with the stem in 35
this position and the valve wide open and under
full pressure. ,Key 34 is a long key arranged to
,slide in both the keyway in solid stem 28 and
hollow stem 31. . Key 34 is provided with a hook
on its upper end so as to be readily removable 40
through top of hollow stem '31 upon removal of
lubricating plug body 42. In assembling the
valve, key 34 isv temporarily inserted in the key
ways and handwheel 28 is rotated counterclock
wise until cage 8 contacts shoulder 52. Then they 45
handwheel is rotated clockwise a suilicient amount
to back cage 8 away from shoulder 52 approxi
mately one eighth of an inch; Key 34 is then
removed and handwheel 28 rotated counter
screw threads 5 between inlet bushing 1 and
cage 8 causing an endwise movement of the valve
disc l8 to its seat 6, and conversely an opposite
clockwise until shoulder 28 is contacted by the
shoulder on hollow stem 31. Key 34 is then 50
permanently inserted at the ?rst angular match
rotation of handwheel 28 reverses the function of ing point of keyways in solid stem 28 and hollow
the helical gears and screw thread 5, causing valve. stem 31. Thus the opening of the valve is limited
55 disc l8 to move away from its seat, thus closing by shoulder 28 which forms the auxiliary seal 55
under packing 21 making it possible to repack
or opening the valve as the operator may desire.
The tangent of the helix angle of thread 5 and the gland when the valve is wide open and in
the tangent of the helix angle of helical gear 15 _ service under pressure. Since the tangent of the
may be, and preferably will be, selected'to be less helix angle of screw threads 25 is less than the
than the coe?icient of friction of the contacting _ coefilcient of friction, hollow stem 31 when in this
materials so, that ‘when valve is closed with valve top position is locked,with its shoulder in contact 60
disc 18 firmly seated against valve seat 6, cage 8 against shoulder 28 en- bonnet 24, and yoke 35
is doubly locked against any change in position ‘may safely be removed if desired to facilitate the‘
through the locking action of threads 5-and of removal of gland parts 32 and 33 for renewing
65
‘
packing 21. Part 48' is an end thrust washer or
Part 24 is a valve bonnet held in place by ca’p
screws or studs 23 and "provided with gasket 2|,
gland 32, gland packing 21 and gland'i'ollower
33. Gland follower 33 is provided with studs 48
bearing limiting the movement of solid stem 28 in
helical gear l5.
_,
'_ j
and nuts 41- for adjustment or removal for re
packing as the case may be.
-
In Eigures 3 and 4, illustrating the non-rising
stem design, bonnet 24 is provided with a ma
an upward direction.
"Referring to Figures 1 and 2,,a top ?ange and
bearing is provided on bonnet 24 to receive hand
wheel 28, which is secured by means of handwheel
retaining ring 29 and cap screws 38. Yoke 35 is
fastened to handwheel 28 bymeans of cap screws
3| and fitted with feather keys 33 which are
chined shoulder 28, a, companion shoulder being ' engaged in keyways 38 in hollow stem 31. Thus
75 machined on‘ solid stem 20. A counterclockwise the operation of handwheel 28 in either clockwise
5,
2, 133,988
3,
or counterclockwise direction causes a‘ corre
sponding rotation of hollow stem 31 and of solid
of the operator by means of the handwheel 28
stem 20, thereby controlling the movement of the
valve ‘within the body.
In practice, hollow rising stem 31 may be cali
brated‘and marked along the edges ‘of keyways
Attention is
threads 5 may
bushing l1 and
cage 8, without
and helical gear I5.
‘
called to the fact that screw‘
be introduced connecting outlet
cage 8, or connecting body 2 and
destroying the functional opera
38 from zero to one hundred percent in suitable tion of' the various parts, the'location shown~
subdivisions thereof, using top of key 38 as an ‘being chosen because expansion strains due to
indicator, to show percentage opening of valve
10 disc It) with respect to valve seat 6. Thus, hollow temperature differences are eliminated.
The following are given as examples of the
rising stem 31 becomes an indicator which may corrosion and, or erosion resisting metals or alloys
be observed from a distance to tell whether the of which parts 1, 8, III, II, l2, l3, l4, l1 and
valve is in the closed or open position, and, upon I9 may be made: Monel metal; eighteen eight‘
closer inspection, the percentage opening at which chrome nickel steel; ‘stainless steel of either the
the'valve is set.
’
-
Hollow stem 31 is provided with conically ta~
pered threads in its top to accommodate lubri
hardenable or non-hardenable variety; acid re
15
sisting brass, that is to say brass of the type
composition
copper, 10% tin and 5% lead;
cating plug body 42. This plug body 42 is ?tted ulow chrome 85%
nickel
cast iron; high chrome cast
with, lubricating plug 45 which is held in place
20 by means of conically tapered threads 39... Gland ,1’ iron; cast hard chemical lead; hard'brass or
Feast iron. For corrosive services where erosion is
44 is provided with a shoulder 43 which prevents oi‘ consequence the hardenable stainless steels- or
the plug 45 from beingtotally unscrewed‘ from high chrome, cast iron, may be used and heat
plug body 42. Lubricating plug 45 is sealed by treated
for extremely high resistance to abrasion.
gland packing 41 and gland 44 and is ?tted with Although the parts 1, 8, 10, ll, l2, l3, I4, l1 and
a lubricating ?tting 46, comprising a ball check‘ I9 have been described above as being formed of
(not shown) and a lubricant passageway 40.
corrosion or erosion resisting metals, it will be
Thus, to lubricate the inside working parts of evident from the foregoing description that the
the valve, lubricating plug 45 is ‘partially un
invention is not confined to use of the said metals, "
screwed" from conically tapered threads 39 and
30 seated against shoulder 43. A lubricating pres‘ since it is evident from the foregoing description’
that the said parts may be formed from any
sure gun is then applied in the usual manner‘ metal or material suitable for use under the con
forcing lubricant through tapered threads 39
_- which-are in a partially opened position. Since
keyways in'solid stem 20 and hollow stem 81 are
ditions under which the device is to be vused.
‘The following services in which metals or alloys
of the above type maybe expected to greatly pro- "
slightly deeper than necessary to accommodate long'the useful life of ‘the valve over what is cur
the key 34, passageway is,provided for lubricant rently obtained arev given as examples: natural
from the space below lubricating plug 42 to-the gasoline, natural 'gas and absorber oil, produced
space below hollow stem 31. Thrust washer 49’ or circulated innatural gasoline plants particu
is loosely ?tted in boss. 22 and around solid stem ; larly if the ?eld is in a sour crude district; inter
28 so that lubricant may pass through to all the
space around the helical gears and between inlet
bushing 1, outlet bushing 11 and body 2. After
~ replenishing the lubricant as above set forth plug
45 is returned by means of wrench or pliers to a
45 tight ?t in tapered threads 39, thus closing the
system without placing ?nal reliance on the ball
check, which is part of lubricating ?tting 46. An
mediate products-in an oil re?nery such as un
treated naphtha or refined oil distillates, acid
sludge, water washafter acid treating, caustic
40
and doctor solution lines and weak acid; mine
waters; chemical plant products handling ?uids
-which are destructive to-iordina'ry iron or steel 45
parts; salt water from salt wells; sea water in
marine services; sour crudes from oil wells or
crudes from wells where salt water and gritty
particles of sand are entrained; gas repressuring
important feature of the construction is that
gland packing 21 is separated from the corrosive
?uid by the lubricant interposed between it and ‘plants where the-gas is' not perfectlyfree from
the ?uid passageway. Packing 2.1 is therefore sulphur compounds or hydrogen sulphide.
kept lubricated and in an ideal operating condi
The metals and alloys given above together
tion. Although the lubricating device is shown
with the services mentioned are merely intended
mounted on the top of the stem, it need not to be illustrative since it is obvious that many
necessarily be at that point but may be screwed ‘ other metals or alloys or other materials may be
into the body as is shown in Fig. 4 or at any selected to meet the needs of a particular service
other suitable location. It is to be understood and that there are many other services .wherein
that any other- suitable means of introducing this invention will advantageously function. It
lubricant‘may'be
used in conjunction with this is, not the intention to limit the invention to
60 valve.
‘
the use of materials, or to the services to which
In Fig. 4 illustrating the non-rising stem design ' it may be applied, given as examples.
~
the lubricating device will be screwed directly
into body 2, as shown, or in any other convenient
65
Having described my invention, I claim:
1. A device for controlling the ?ow of ?uids '
locationrrbut functions otherwise in a similar
comprising a housing provided with an external
manner to the one described above.
boss, the housing having secured therein inlet 65
and outlet bushings, one of said bushings being
_. 1
I
It is. to be noted that .the cage 8 is sup‘ rted
internally of'the housing 2 by the bushings 1
provided with screw threads to mesh with an
and I1 and that the longitudinal axes of the,
internally supported and guided concentrically
70 cage 8', bushings 1 and I1 and the streamlined
valve are-all‘ in the same straight line, so that
upon rotation of the sleeve 8 about its'axis the
streamlined valve is moved along the same axis
by screw threads 5 towards or away from the
valve seat 5, said movement being under control
rotatable and endwise movable cylindrical cage
provided with corresponding companion threads 70
and with a valve attached and ?xed concentri
cally therein, said cage being further provided
with helical gear teeth cut on the‘external cy
lindrical surface thereof, the said-bushings and
cage providing a lining through the housing 75
2,188,988’
4
throughout the ?uid. passageway, a helix for the
gear teeth on the cage, said helix being ?tted
within said boss, and a stem attached to said
helix for rotating said helix.
'
2. A device for controlling the ?ow of ?uids
.comprising a housing, two ‘bushings extending
within the body of said housing, one of said
bushings serving as an inlet for ?uid and the
other serving as an outlet for ?uid, a tubular body
10 within said housing connecting said two bushings,
said two bushings and said tubular body' forming
a continuous passageway and said tubular body
being rotatable about its axis and endwise mov
able; a valve in said tubular body, spaced from
15 the interior-wall thereof, and movable there
with; a seat for said valve in said passageway,
and means for rotating said tubular body and
for imparting endwise motion thereto operable
from the exterior of said housing to move said
'20
valve towards or away from its seat.
3. A device for controlling the ?ow of ?uids
comprising a housing, two bushings extending
within the body of said housing, one of said bush
ings serving as an inlet for ?uid and the other
25 serving as an outlet for ?uid, a tubular body
within said housing connecting said two bush
ings, said two bushings and said tubular body
forming a continuous passageway and said tubu
lar body being rotatable about its axis and end
30 wise movable; a, valve in said tubular body, spaced
from the interior wall thereof, and movable
outlet means extending within the said housing
with their innermost ends separated, a tubular
body within the housing connecting said tubular
inlet and outlet means, said tubular inlet and
outlet means and said tubular body forming a
continuous passageway and said tubular body be
ing endwise movable without destroying the con
tinuity of said passageway; a valve in said tubu
lar body, spaced ~from the interior wall thereof,
and movable therewith; a seat for said valve in 10
said passageway, and means operable from the
exterior of said housing for moving said tubular
body endwise to move said valve towards or away
from its seat.
.
'7. A device for controlling the flow of ?uids 15
comprising a housing, tubular inlet means and
outlet means extending within the said housing
with their innermost ends separatedya tubular
body within the housing connecting said tubular
inlet and outlet means, said tubular inlet and 20
outlet means and said tubular body forming a
continuous passageway and said tubular body
being rotatable about its axis and endwise mov
able; a valve in said tubular body, spaced from
the interior wall thereof, and movable therewith; 25
a seat for said valve in said passageway, and
means for rotating said tubular body and for im—
. parting endwise motion thereto operable from the
exterior of said housing to move said valve to
wards or away from its seat.
30
-
8. A device for controlling the ?ow of ?uids
comprising a housing, tubular inlet means and
therewith; a seat for said valve in said passage- _
way, means engaging the exterior of said tubular outlet means extending within the said housing
body operable from the exterior of said ‘housing with their innermost ends separated, a tubular
for rotating said tubular body, and means for body within the housing connecting said tubular 35
imparting endwise motion to the tubular body inlet and outlet means, said tubular inlet and
outlet means and said tubular body forming a
upon rotation thereof to move said valve towards
or away from its seat.’
-
4. A device for controlling the ?ow of ?uids
comprising a housing, two bushings extending
40
within the body of said housing, one of said bush
ings serving as an inlet for ?uid and the other
serving as an outlet for ?uid, a tubular body
within said housing connecting said two bushings,
said two bushings and said tubular body forming
45
a continuous passageway, said tubular body and
each bushing with which'it is connected‘ ?tting
one within the other in a relationship permitting
continuous passageway and said tubular body be
ing rotatable about its axis and endwise mov
able; a valve in said tubular body, spaced from 40
the interior wall thereof, and movable therewith;
a seat for said valve in said passageway, means
engaging the exterior of said tubular body op
erable from the exterior of said housing for ro
tating said tubular body. and means for im
45
parting endwise motion to the said tubular body
upon rotation thereof to move said valve towards
or away from its seat.
}
'
/
9. A device for controlling the ?ow of ?uids
comprising a housing, tubular inlet means and 50
to be moved endwise; a valve in said tubular ‘
outlet means extending within the said housing
50 body, spaced from the interior wall thereof, and
their innermost ends, separated, a tubular
movable therewith‘; a seat for said valve in said with
body within the housing connecting'said ‘tubular passageway, means engaging the exterior of said
tubular body operable from the exterior of said inlet and ‘outlet means, said tubular inlet'and
housing for rotating said tubular body, and means outlet means and said tubular body forming a
55 for imparting endwise motion to the tubular body continuous passageway, said tubular body and
of’ said tubular-inletand outlet means with
upon rotation thereof tomove said valve towards each
which it is connected ?tting one within the other
or away from its seat.
'
<
in a relationship permitting said tubular body to
5. A device for controlling the ?ow of ?uids be rotated about its axis and to be moved end’
60
comprising
a
housing,
tubular
inlet
means
and
60
wise; a‘valve in said tubular body, spaced from
outlet means extending within the said housing
interior wall thereof, and movable therewith;
with their innermost ends separated, a tubular the
a seat for said valve in said passageway; means
body within the housing connecting said tubular engaging
the exterior of said tubular body oper
inlet and outlet means, said tubular inlet and able from the exterior of said housing for ro
outlet means and said tubular body forming a tating said tubular body, and means for impart
continuous passageway ‘and said tubular body be
ing endwise motion to the tubular body upon ro
ing endwise movable without destroying the con
tation thereof to move said valve towards or away
tinuity ' of said passageway; a valve and seat
said tubular body to be rotated about itsaxis and
therefor positioned in said passageway and one"
from its seat; "
-
operablev from the exterior oi.’ said housing for
moving said tubular body endwise to vary the dis
three sections within said body, the central of
10. A device for controlling the ?ow 0i ?uids 70
70 of which moves with said tubular body, and means , comprising a body and conduit means comprising
tance between said valve and valve seat.
6. A device for controlling the ?ow of ?uids
75 comprising a housing, tubular inlet means and
said three sections being supported by the two >
end sections and endwise movable without de
stroying the continuity of said conduit means; a 75
5
2,138,983
valve within said movable section, spaced‘ from
the interior wall thereof, and movable ‘there
with,‘ a seat for said valve on one of said end
sections within said conduit means, and means
for moving said movable section endwise to move
said valve towards or away from its seat.
11. A device for controlling the ?ow of ?uids
comprising a body and conduit means comrising
three sectionswithin said body, the central of
'10 said three sections being supported by the two
end sections and rotatable about its axis and end-_
wise movable without destroying the continuity
of said conduit means; a valve within said mov
able section, spaced from the interior wall there
15 of, and movable therewith, a seat for said, valve
on one of said end sections within said conduit
means, and means for rotating and endwise mov
ing said rotatable section to move said valve to
wards or away from its seat.
20
'
12. A device as'de?ned in claim 2, in‘ which
the two bushings, tubular body and valve are of
corrosion resisting material.
13. A device as de?ned in claim 2, in which
‘the two bushings, tubular body and valve are of
25 erosion resisting material.
.
14. A device as ‘de?ned in claim 5, in which
the tubular inlet and outlet means, the tubular
body and the valve are of corrosion resisting ma
terial.
15. A device as de?ned in claim 5, in which
the tubular inlet andioutlet means, the tubular
body and the valve- are of erosion resisting ma
terial.
'
i 16. A deviceas de?ned in claim 10 in which
the three sections and valve are of corrosion re
sisting material.
>
17. A device as de?ned in claim 10 m which‘
the three sections and valve are of erosion resist
10
ing material.
18. A device for controlling the ?ow of ?uids
comprising a body and conduit means compris
ing three sections within said body, the central
of said three sections being supported by the two
end sections and endwise movable without de 15
stroying the continuity of said conduit means; a
valve within said movable section, spaced-from
the interior wall thereof and movable therewith,
‘a seat for said valve on one of said end sections
within said conduit means, means for moving 20
said movable section endwise to move said valve
towards or away from its seat, the exterior sur
face'of said conduit means being spaced from the
interior surface of said body to provide a space -
for the reception of lubricant and means for in
troducing lubricant into said space.
AUDLEY D. GASTON.
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