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Патент USA US2406927

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_'sept.~ 3, 1946.
w; T, TABB
‘
2,406,927
HIGH PRESSURE FLUID PUMP GASKETING
Filed Marché6, 1945
1.
INVENTOR.
AJATToRNEv/s
Patented Sept. 3, 1946
2,406,927
UNITED STATES PATENT OFFICE
2,406,927
‘
HIGH-PRESSURE FLUID PUMP GASKETING
Warner T. Tabb, Plain?eld, N. J., assignor t0
Eisemann Corporation, Brooklyn, N. Y., a cor
poration of Delaware
Application March 6, 1945, Serial No. 581,289
11 Claims.
1
This invention relates to a high pressure ?uid
pump more particularly adapted for use in fuel
(01. 309-—-2)
2
nection to a substantially low pressure supply
system such as a supply tank of fuel oil and
supply and venting conduit means. In apparatus
such as those of the “Diesel” type, and to features
of improvement disclosed in my application Serial C21 of that type there may be provided a casing struc
ture having a substantially axially arranged bore
No. 429,464, ?led February 4, 1942, now Patent
therein in which is mounted suitable metering
No, 2,372,694 granted April 3, 1945, and of which
valve structure through which low pressure fuel
this application is a division.
may communicate through passages to a plurality
A general object of the invention is the pro
vision of such apparatus which can readily and 10 of pump plunger bores, one for each cylinder of
injection systems for internal combustion engines
economically be manufactured in quantity pro
duction with interchangeable parts, easily as
sembled and effectively and efliciently used.
A more speci?c object of the invention is the
provision of such pump structure so constructed
and arranged as to necessitate quite accurate ?t
ting between mating parts of plunger structure
the engine, arranged circumferentially of the
axial bore with, if desired, such pump plunger
bores being provided by suitable plunger bush—
ings mounted in circumferentially arranged holes
in a‘ casing, the casing and bushings comprising
casing means. These pump plunger bores may
further be suitably vented to low pressure fuel
supply or a chamber connected thereto cooperat
and associated casing means structure, such as
ing in the obtainment of substantially in
bushing structure, of‘ only one relative short por
tion of the length thereof, e. g. of only the port 20 stantaneous cut-off of fuel under high pressure
supplied from suitable nozzle structure to each
section of a. plunger in a plunger bore, and with
of the engine cylinders. Each pump plunger
suitable provision of a low pressure ?uid leakage
bore has associated therewith a suitable pump
chamber to avoid high pressure leakage.
plunger for reciprocative action therein and
Another object of the invention is the pro
vision of efficient low and high pressure gasketing 25 plunger operative means such as a suitable cam
device common to the plurality of pump plungers
of a plunger bushing in a casing bore whereby
for successive operation thereof which latter
effective and simple low pressure ?uid sealing
structure may be located in a chamber in the case
does not interfere with proper positioning of the
ing structure with the chamber serving as a pump
bushing and whereby‘ a plug of a discharge con
duit system may directly engage the bushing 30 sump,’ and more particularly with the means for
and/or engage a gasket on the bushing to move
and hold the bushing in a predetermined position
in the pump ‘bore and to accurately locate the
plug in a predetermined position in the pump
bore.
'
Other objects of the invention will in part be
obvious and will in part appear hereinafter.
For a fuller understanding of the nature and
objects of the invention reference should be had
sealing and accurately locating the bushing in
which the pump plunger bore is formed within
the casing.
Referring to the drawing, like numerals refer
to‘like parts throughout. A casing I0 formed if
desired of metal may, in accordance with one
embodiment of the present invention, be provided
with a bore ll counterbored to provide a shoul
der l2 preferably tapered, that is, conforming ‘to
to the following detailed description takenin cone 40 the surface of a truncated cone as‘shown, and
further counterbored to provide an additional
nection with the accompanying drawing, in
which:
shoulder [3 which may have the surface thereof
lying in a plane substantially normal to the axis
Figure l is‘ an elevational sectional view with
parts broken away of casing means, a pump
of the bore. Inward of the high pressure end
plunger and associated structure of one embodi 45 the bore H- is preferably internally threaded as
ment of the present invention;
shown at M and the outward end thereof is coun
Figure 2 is an elevational view of a pump
terbored at l5 to receive plunger spring rigging,
plunger of the present invention;
cam follower and associated structure. A rela
Figure 3 is a sectional view taken on line 3‘—-3
tively low pressure fluid passage I6 is formed
of Figure 2.
therein communicating with the bore II and
The present invention is adapted for incorpo
adapted to be connected through suitable pas
ration in a pump of the general type disclosed in
sages and metering valve structure to a relatively
Purdy United States: Patent No. 2,166,876 of July
low pressure ?uid supply and may serve both
18, 1939, Which‘ as more speci?cally explained
for supplying and venting relatively low pressure
therein constitutes an apparatus adapted for con 55 ?uid to and from pump plunger bore. An addi
2,406,927
3
tional venting passage I‘! may also, if desired, be
provided.
Bushing means are ?tted into the bore H and
may comprise a main bushing section I8 having
the high pressure end thereof ?tted into the bore
II, snugly if desired, inwardly of the shoulder
I3 such as at I9 for proper location of the bush
ing in the casing and set back in a midsection
thereof such as at 20 to provide a shoulder 2| to
4
In any case the arrangement is such that co
operating shoulders such as at I3 and 2I pro
vide a substantially high pressure ?uid-tight seal
and determine the position of the bushing in the
casing and a gasket such as that at 24 is de
formed by shoulders such as at I2 and 23 to pro
vide a substantially low pressure ?uid-tight seal
without objectionably interfering with the de
sired locating or positioning of the bushing in
the casing. By virtue of such structure it is not
necessary to have the ‘bushing carefully ?tted
cooperate with the bore shoulder I3 with the in
terpositioning therebetween of a high pressure
into the bore II throughout the length thereof
gasket 22, formed of any suitable material such
and as shown it may be spaced from the bore
as, by way of example, dead soft copper. The
wall between paired shoulders I3, 2! and I2, 23
bushing I8 is further set back to provide a shoul
and also outwardly of the latter thereby sim
15
der 23 adapted to cooperate with the bore shoul
plifying manufacturing. As a result the bushing
der I2 and ‘between the latter two shoulders is
is sealed into the casing at two different places
con?ned a low pressure gasket 24 formed of any
simultaneously by the single act of sliding or
suitable material such as, by way of example,
forcing the bushing into the casing to a prede
Babbitt metal. In the preferred form the gas
termined position (where it is to be held), and
ket 24 is made substantially rectangular in sec 20 such locating is determined by only one pair of
tion and deformed (to the shape shown) by the
cooperating shoulders making for convenience in
tapered seat I2 when the main bushing section
dimensioning and manufacturing to tolerances.
I8 is forced into position with the high pressure
Additionally, necessity of carefully aligning the
gasket 22 predetermining such position. Obvi
surface of shoulder 23 with any cooperating cas
ously the tapered shoulder may be provided on 25 ing surface (as would be required if a consider
the bushing and the right-angled shoulder in
able area of ?at gasket surface seating on op
the bore II or both shoulders may be tapered if
posed shoulders was used in lieu of the deforma
desired. Further, the gasket 24 may be provided
tion feature characterizing the present invention)
with a tapered face to cooperate with the ta
eliminated.
pered shoulder but adapted to be further de 30 is Further
high pressure sealing may be attained
formed when the bushing is seated in the casing
by recessing the high pressure end of the bushing
bore thereby to obtain substantially low pressure
I8 such as at 25 and this recess may be so formed
?uid-tight sealing.
as to provide a shoulder 26 substantially normal
The gaskets 22 and 24 may, if desired, be
to the axis of the bushing and a tapered shoulder
formed of similar material that may be relatively 35 21 substantially conforming to the surface of a
resistant to deformation but capable thereof, or
truncated cone. A gasket 28 of suitable deform
relatively softer material readily capable of de
able material such as, by way of example, dead
formation, so long as the seating area of gasket
soft copper, which may be initially substantially
22 is substantially greater than that of gasket 24.
rectangular in section is compressed within the
The latter feature assures that gasket 24 while 40 recess 25 with its outside surface 29 engaging the
providing a substantially low pressure ?uid-tight
wall of the bore I I, one ?at surface engaging the
seal will not prevent a proper seating and sub
shoulder 26 and a portion deformed to conform
'stantially high pressure ?uid-tight sealing at
to the tapered seat 21. This deformation is at
gasket 22 when the bushing I8 is forced into the
tained by the positioning of a plug 30 in the
casing bore II to a desired position determined 45 high pressure end of the bore II such as by
by the cooperating shoulders I3 and 2| and gas‘
threaded engagement therein with the end of
ket 22. The arrangement would be such that
the plug engaging the other flat face of the gasket
the low pressure gasket 24 would be adapted to
28. The plug 30 thus retains bushing l 8 in posi
be considerably deformed, relatively speaking, by
tion
in the bore II and is provided with a cen
positioning of the bushing in casing, whereas 50
tral opening which may have a portion thereof
the high pressure gasket 22 which serves to de~
shaped to provide a seat for a check valve 3|
termine the longitudinal position of the bushing
which
communicates with a bore in the plug
in the casing is not appreciably deformed by the
adapted to receive a coupling member connecting
locating operation. Further, a substantially high
pressure ?uid-tight seal may be attained at ,55 thereto suitable conduit means leading to suit
able nozzle structure in the wall of an engine
shoulders I3 and 2| with the omission of gasket
cylinder (not shown) .
22 by providing a lapped joint between comple
The extent to which the gasket 28 may be
mentary shoulders thereat which would serve to
compressed is limited and accordingly it may be
attain the desired seal and determine the posi
tion of the bushing in the casing with the gasket 60 used with the associated structure accurately to
limit the insertion of the plug 30 into the bore
24 being deformed to attain the low pressure seal.
II due to the fact that after the gasket is de
The gasket 24 may be made of material softer
formed to the shape shown, flat surfaces of con
than that from which the high pressure gasket
siderable area are engaged by shoulder 26 and
‘22 is formed, such as relatively soft deformable
material, for example, soft metal of little elas 65 the end of the plug 30. Obviously the gasket 28
ticity, e. g. copper, lead, alloys thereof, etc., or
from resilient material such as rubber, synthetic
may be initially formed with a bevelled surface
to cooperate with the tapered surface 2'! of the
bushing I8 but provided sufficiently oversized so
rubber, neoprene and the like. In such case it
as to obtain deformation as the plug 30 is forced
would not be essential to make the shoulder I2
into
the bore I I.
70
tapered or of other shape initially to provide a
With respect to the high pressure gasket 28, as
relatively small seating area since obviously a
in the case of gasket 24, reliance may be placed
greater seating area, such as provided by a rel
on a small area of initial gasket seating, such
atively wider, substantially ?at transversely ex
tending shoulder, could be used with the attain
ment of similar ends.
area of seating being increased thereafter during
the ?nal stages of forcing the plug 30 into its
5
aroma?
L?nal position. 'Qbviousl ,‘lthe material forjgasket
wmit .sa {spring ibiaiSBd :valve ;in nozzle structure to
‘.218 will :be :selected which will provide for the
;close thereby cutting voff iiuid’discharge from-the
(nozzle. :Such 1a ifeature, “howevenvis not essential
desired deformation, sealing and limiting of
movement :of the .plug .30 into the end of the
casing bore which, of course, will in part *be .de
to ithe istructune iof the ‘present :invention.
'
‘In the icounterbored portion ~15 of the bore .of
pendent upon dimensions of associated structure
relating to this feature. Fundamentally this fea
tureis characterized by deformationo-f thegasket
the casing 110tis reciprocatively‘mounted a skirted
‘i‘Dr ‘tubular plunger follower 35 having a follower
roller :38 mounted therein, engaging ‘a suitable
duringan initial portion .of the operation of .forc
cam surface 440 ‘which may be .iocated in a pump
;ing ‘the plug 30 ;into .bore ll while enablingplug 11.0 sumporrcamchamber.
~30 ?nally to i?nd a positive seating surface :of
1A pump ‘plunger 42 of :any suitable design may
suliicient area so that termination of its move
be suitably fitted in :the plunger bore (.32 of the
mentinto the bore is ‘well de?ned vand accords
bushing 1118 and preferably comprisesahig‘hipres
with a predetermined position. The ?nal seat
ing surface of area greater .than the initialseat- 5 sure :end 43, a portse'ction :44, a sealing section
‘145, ‘and an outward aoperable end 46»"f0r engage
:ing surface may .here ‘:be :provided by the rel
ment with the projecting portion 14! of the :fol
.:ativelyilarge area offinal seating of the surfaces
‘lower 3-5 for inward :movement lthereby.
of the gasket 28 and the shoulder 26 and this
Circumambient :of the plunger 42 ‘is varranged
in cooperation with resistance by the gasket ma
terial to deformation ‘beyond a certain 'degree{ an :auxiliary bushing section 41 ‘which may be .a
:collar ‘radially spaced ‘therefrom and having 1a
may determine the ‘?nal 'position ofthe plug in
flange T48 ‘in ‘substantially :low ‘pressure ?uid-tight
thecasing. Alternatively ‘the ?nal seating of the
sliding
engagement “with ‘the sealing section '45
.plug 30 may be provided by seating it on the
of ‘the plunger 42 to ‘provide a leakage recess
‘end of the bushing :as shown in Figure '1 and
F419. 'Themaintbus‘h'ing section l8 is’provicle'd with
referred to vmore fully hereinafter. As a con- 1
a -‘shoulder ‘:50 “which 'is engaged by one endof the
“sequence this third gasketing avoids the neces
‘collar "4;? preferably with :a transverse sliding lit
sity of carefully aligning cooperating surfaces of
the bushing and plug and similarly carefully
‘aligning-cooperating surfaces of the bushing and
to assure the formation of a leakage chamber
‘constituted by recess 49 and ‘freely permitting
self-alignment 'of the plunger with respect to the
easing. Aislight misalignment of the plug sur (30
‘bushing and with respect to the collar. The so
face with a transverse bushing surface such as
rormed leakage chamber may be vented in any
26 and likewise similar misalignment of the end
suitable manner ‘such as rby a passage 51 com
surface of the plug with the end surface of the
municating with a passage 52 in communication
“bushing would not give‘rise to any problems and,
with passage I16. The bushing l8 may’be ‘ported
of course, there is no problem of leakage here
'at'5'3.
involved.
vThe collar ‘41 may be held ‘in engagement with
‘The tapered seating surfaces I2 and 21 have
the main bushing section 18 by ‘any suitable
been chosen as a matter of ‘convenience whereby
means. By way of example, a plate 86 having a
the initial small seating area permitting increase
‘spring
seating ?ange ‘81 ‘may be mounted on the
thereof during gasket (deformation is readily ob
end “416 of ‘the plunger 42 by ‘placement of suit
tained. Obviously, however, this may be obtained
able means such ‘as a split ring 88 in the groove
‘by other arrangements such as stepping ‘the
$64,
The opposite end of the spring 54 may 'be
shoulder whereby the seating surface for the in
seated directly against casing structure as by
itial seating is in one or more transverse planes
seating v‘it against a shoulder ‘89 on the casing
10 and the collar 41 may‘be‘held in engagement
with ‘the ‘casing means or ‘bushing 18 by an aux
iliary spring 90 seated at one end on plate 86
and at the other end against the collar~41 or the
‘but of sufficiently small‘total area to permit'ready
deformation of the gasket thereafter and provide
for increase of the seating surface such as by
‘bringing into operation additional seating sur
faces in transverse planes upon such further de
formation.
flange 48 thereof.
:50
It will be seen that with respect to the gas
keting arrangementiproposed above there is pro
vided a structure wherein a bushing ‘is sealed
‘to a casing against low pressure at one place
Means are “preferably provided on the plunger
‘to cooperate with the ?ange 48 of the collar .41
so that a *subassem'bly may be provided. ‘Such
‘means may constitute a pin 63 located in there
without locatively determining the posit'ionof 'the . Or’Ga cess or chamber 49 and 'loosely'held in a trans
verse hole 69 in the plunger 42 ‘by the collar 41.
‘bushing with respect to the casing, is sealed
against ‘high pressure at another place and its
position with respect to the-casing locatively de
termined thereat, and, is sealed against “high
The plunger 42 preferably is provided with a
plurality of sets of supply and'venting ports selec
tively to be used for delivery of different quanti
pressure, but not located with respect to the "(10 ties of ?uid. The set of supply ports may be three
in number arranged “circumferentially of the
casing at a third place, and in addition -a plug
plunger ‘about 120° apart as indicated in Figures
holding ‘the bushing assembled in the casing is
2 ‘and '3 and may comprise ports 10, ‘H and ‘I2
?rst sealed and ?nally locatively positioned ‘at
‘each having a working or effective controlling
that third place.
edge 13 located at a certain point along, ‘the
“The bushing i8 is provided with a plunger
‘plunger. A set of venting ports are paired with
bore 32 which, if desired, may have the high
the‘supp’ly'ports and may comprise the three sim
pressure end thereof counterbored as at 33 with
ilarly arranged as indicated at "l4, l5 and 16,
a passage 34 communicating between the coun
terbored portion 33 and the passage l1. Such a
feature is disclosed in the Tabb »:et a1, United “
States Patent 2,247,421 of July ‘1, 1941, wherein
it is explained that fluid under pressure in front
of the pump plunger is vented through such pas
sages to reduce the ‘pressure of the ‘fluid in the
conduit ‘to the (engine ‘cylinder vsufficier-itly ‘to ‘per- i"
each of. which has an. effective or working edge
"H also arrangedat a ‘certain point. The distance
between. the edges 7-3 and T! of any pair of ports
angularly positioned ‘for cooperation with effec
tive or Working edges of the port or ports of ‘a
passage or passages leading intothe plunger bore
determines thelcapacity of the pump cylinder for
that particular plunger position, This distance
2,406,927
7
.
minus a corresponding distance between the effec
tive or working edges of the casing means port or
ports is the length of the effective stroke of the
plunger. If desired, the effective working edges
of a certain pair of supply and venting plunger
ports may be located at a distance apart di?ering
from that for other pairs of ports, which as shown
only by way of example differs for any one pair
of ports. With one port provided by passage 53
in the bushing serving both as a bushing supply 10
port and bushing venting port for each plunger
bore, as shown by way of example in the struc
tures depicted in the drawing, this distance be
tween effective edges of bushing ports is the dis
8
cating therewith, said bore being counterbored
to provide two shoulders, one on each side of
the ?uid passage, a bushing in said bore ?tted
thereto inwardly of the pair of shoulders and
having a ?uid passage extending therethrough
for communication with the casing ?uid passage
and two shoulders, one on each side of the bush
ing ?uid passage and with each paired for co
operation with one of the bore shoulders and a
high pressure end, a high pressure seal being
provided at the cooperating pair of shoulders in
ward of the passages, and a low pressure sealing
gasket of deformable material between the co
operating pair of shoulders outward of the
passages, said pair of shoulders at the high pres
15
tance between a leading effective edge 53l and a
sure
seal solely cooperating to limit movement
trailing effective edge 532 which is the same for
of said bushing into the bore for proper location
all pump cylinders and for all positions of any
thereof.
one pump plunger, The effective stroke of any
2. In a high pressure ?uid pump the combina
one pump plunger of the depicted structures for
tion comprising, a casing having a bore and a
any one pair of supply and venting ports is the
relatively low pressure ?uid passage communi
distance between edges 13 and 1'! thereof minus
cating therewith, said bore being counterbored
the distance between bushing port edges 53! and
to provide two shoulders, one on each side of the
532. As desired, the supply ports 10, ‘H and 12
?uid passage, a bushing in said bore ?tted there
and venting ports l4, ‘l5 and 16 may be formed
to inwardly of the pair of shoulders and having
with their edges respectively arranged as shown 25
or may be formed with all of the effective trailing
edges 13-43 of the supply ports arranged in the
same transverse plane and effective leading edges
11-11 arranged in different transverse planes.
a ?uid passage extending therethrough for com
munication with the casing ?uid passage and two
shoulders, one on each side of the bushing ?uid
passage and with each paired for cooperation
with one of the bore shoulders and a high pres
A further alternative is the arrangement of all 30 sure end, a high pressure seal being provided at
leading edges 11—11 in the same transverse plane
the cooperating pair of shoulders inward of the
and the trailing edges 13-13 in different trans
passages, a low pressure sealing gasket of de
verse planes.
formable material between the cooperating pair
The outward end of the main bushing section
of shoulders outward of the passages, said pair
l8 may be provided with a ?ange 80 circumam 35 of shoulders at the high pressure seal solely co
bient of the plunger 42 preferably within the
operating to limit movement of said bushing into
chamber 49 and this ?ange may be provided with
the bore for proper location thereof, said bushing
three pairs of diametrically opposed longitudi
having its high pressure end recessed adjacent
nally extending ways or slots 8l--Bl with each
pair arranged about 120°v from the successive 40 the bore wall to provide a gasket seat, a gasket
of deformable material on said seat, and a plug
pair similar to the arrangement of the pairs of
forced into the bore with the last-mentioned
ports in the plunger. A pair of opposed slots
gasket compressed between said bushing and said
8l-—8| are adapted to receive the opposite ends
plug.
of the pin 68 as shown in Figure 1 for positioning
3. In a high pressure ?uid pump the combina
of a pair of supply and venting ports of the 45
plunger in selected communicative relation to
the port end of passage 53.
As described above, the high pressure gasket
28 may predetermine the position of the plug 30
in the high pressure end of the casing bore ll.
Such predetermination of position may addi
tionally be attained, as indicated, by causing the
end of the plug 3!! to engage the high pressure
end of the bushing l8 such as at 9| as shown in
tion comprising, a casing having a bore and a
relatively low pressure ?uid passage communi
cating therewith, said bore being counterbored
to provide two shoulders, one on each side of
the ?uid passage, 2. bushing in said bore ?tted
thereto inwardly of the shoulders and having a
?uid passage extending therethrough for com
munication with the casing ?uid passage and two
shoulders, one on each side of the bushing ?uid
Figure 1 after the gasket 28 has been suitably 55 passage and with each paired for cooperation
with one of the bore shoulders and a high pres
deformed and depressed in the recess 25. The
sure end, a high pressure gasket between the
provision of the gasketing 28 makes possible the
cooperating pair of shoulders inward of the pas
use of such structure without necessitating ac
sage having a certain area of seating therewith,
curate lining up of cooperating surfaces of plug
and a low pressure sealing gasket of deformable
30 and bushing section l8 at 9|.
60 material between the cooperating pair of shoul
It is intended that all matter contained in the
ders outward of the passages having an initial
above description or shown in the accompanying
area of seating therewith less than that of said
drawing shall be interpreted as illustrative and
not in a limiting sense.
high pressure gasket.
4. In a high pressure ?uid pump the combina
It is also to be understood that the following
tion comprising, a casing having a bore and a
claims are intended to cover all of the generic
relatively low pressure ?uid passage communi
and speci?c features of the invention herein de
cating therewith, said bore being counterbored
scribed, and all statements of the scope of the
to'provide
two shoulders, one on each side of the
invention which, as a matter of language, might
?uid passage, a bushing in said bore ?tted there
70
be said to fall therebetween.
to inwardly of the shoulders and having a ?uid
Having described my invention, what I claim
passage extending therethrough for communi
as new and desire to secure by Letters Patent, is:
cation with the casing ?uid passage and two
1. In a high pressure ?uid pump the combina
shoulders,
one on each side of the bushing ?uid
tion comprising, a casing having a bore and a
relatively low pressure ?uid passage communi 75 passage and with each paired for cooperation
amass?
with one of‘ the: bore: shoulders and a . high pres‘
sure: end; a1 high; pressure: gasket between the
cooperating pair' of: shoulders inward of the
passages having a certain area of: seating‘there
with, one of said outwardly paired‘ shoulders be
ing. arranged" at an oblique: angle to the axis of:
said bushing, and a lowv pressure sealing gasket
of" deformable material between‘ the last-men
tioned pairof shoulders with the oblique angu
larly arranged shoulden'providingwan initial area
of gasket seating less than: that‘ of’ said high
pressure gasket and‘ causing gasket deformation
shoulders: at, the high; pressure; seal. solely coop
crating to limit movement‘ of; said bushing into.
the bore for‘proper locatiolnthereof', said bushing.
having its high pressure-end:provided with gas
. ket seating surfaces, a plugforced: into the ‘bore
and having seating surfaces,- and a gasket of de
formable material compressed between said'bush
ing‘ and: said' plug seating. surfaces, one of the~
bushing: and" plug‘ seating, surfaces being initially
of: a certain area‘ and of! increased area as said
plug is forced, to‘ ?nal location determined‘: by
such seating of increased‘ area‘.
8... In a. high pressure ?uid pump the combina
5; In a high pressure ?uid pump the combina
tion‘ comprising, a casing having a: bore and a, 15 tion comprising; a’ casing having a bore and a
relatively: low pressure: ?uid passage communicat
relatively low: pressure?uid'passage communicat
for effective low pressure, sealing.
'
ing. therewith, said" bore being" count’erbored to
provide two shoulders, one on each side of the
?uid passage, a bushing in said bore ?tted thereto
ing therewith, said bore being counterbored‘ to
provide two shoulders; one on. each side of the
?uid passage, ar-bushing in‘said bore ?tted thereto
inwardly.
off the pair of! shoulders andt having a
inwardly of theishould‘ers and having a ?uid pas 20. fluid" passage
extending‘ therethro'ugh for com
sage extending therethrough for communication
munication with the casing ?uid passage and two
with the casing ?uid passage and two shoulders,
shoulders, one on each side of the bushing ?uid
one on each side of the bushing ?uid passage and
passage and with each paired for cooperation
with each paired for cooperation with one of the
with one of the bore shoulders and a high pres
bore shoulders and a high pressure end, a high
sure end, a high pressure seal being provided at
pressure gasket between the cooperating pair of
the cooperating pair of shoulders inward of the
shoulders inward of the passages and a low pres
passages, a low pressure sealing gasket of de
sure sealing gasket of deformable material softer
formable material between the cooperating pair
than that of the high pressure gasket between
the cooperating pair of shoulders outward of the 30 of shoulders outward of the passages, said pair
of shoulders at the high pressure seal solely co
passages.
operating to limit movement of said bushing into
6. In a high pressure ?uid pump the combina
the bore for proper location thereof, said bush
tion comprising, a casing having a bore and a
ing having its high pressure end provided with
gasket seating surfaces, a plug forced into the
ing therewith, said bore being counterbored to 35 bore and having seating surfaces, and a gasket
provide two shoulders, one on each side of the
of deformable material compressed between said
?uid passage, a bushing in said bore ?tted thereto
bushing and said plug seating surfaces, said seat
inwardly of the shoulders and having a ?uid pas
ing surface on the bushing being of such con
sage extending therethrough for communication
?guration with respect to cooperating surface of
with the casing ?uid passage and two shoulders, 40 said last-mentioned gasket as to provide a cer
one on each side of the bushing ?uid passage and
tain initia1 area of seating and when the plug is
with each paired for cooperation with one of the
relatively low pressure ?uid passage communicat
forced into the bore an increased area of seating
bore shoulders and a high pressure end, a high
whereby to determine ?nal plug location.
pressure gasket between the cooperating pair of
9. In a high pressure ?uid pump the combina
shoulders inward of the passages having a sub 45
tion comprising, a casing having a bore and a
stantial area of seating therewith, one of said out
relatively low pressure ?uid passage communicat
wardly paired shoulders being arranged at_an
oblique angle and the other thereof substantially
at right angles to the axis of said bushing, and
a low pressure sealing gasket ring of deformable
material initially having substantially parallel
outward and inward faces arranged substantially
at right angles to the axis thereof con?ned be
tween the last-mentioned pair of shoulders with
the oblique angularly arranged shoulder initially
having a relatively small area of gasket seating
and causing gasket deformation for eifective low
pressure sealing.
ing therewith, said bore being counterbored to
provide two shoulders, one on each side of the
?uid passage, a bushing in said bore ?tted thereto
inwardly of the pair of shoulders and having a
?uid passage extending therethrough for com
‘ munication with the casing ?uid passage and two
shoulders, one on each side of the bushing ?uid
passage and with each paired for cooperation
with one of the bore shoulders and a high pres
sure end, a high pressure seal being provided at
the cooperating pair of shoulders inward of the
passages, a low pressure sealing gasket of de
7. In a high pressure ?uid pump the combina
formable material between the cooperating pair
tion comprising, a casing having a bore and a
of shoulders outward of the passages, said pair
relatively low pressure ?uid passage communicat 60 of shoulders at the high pressure seal solely co
ing therewith, said bore being counterbored to
operating to limit movement of said bushing into
provide two shoulders, one on eachside of the
the
bore for proper location thereof, said bush
?uid passage, a bushing in said bore ?tted thereto
ing having its high pressure end provided with
inwardly of the pair of shoulders and having a
gasket seating surfaces, a plug forced into the
?uid passage extending therethrough for com
bore and having seating surfaces, and a gasket
munication with the casing ?uid passage and two
of deformable material compressed between said
shoulders, one on each side of the bushing ?uid
bushing and said plug seating surfaces, said gas
passage and with each paired for cooperation
ket engaging only a portion of the plug seating
with one of the bore shoulders and a high pres
surfaces from inception of placement of the plug
sure end, a high pressure seal being provided at 70 in the bore with a substantial portion of the re
the cooperating pair of shoulders inward of the
mainder of plug seating surfaces engaging the
passages, a low pressure sealing gasket of deform
high pressure end of said bushing to determine
able material between the cooperating pair of
?nal plug location.
shoulders outward of the passages, said pair of 75
10. In a high pressure ?uid pump the combi
2,406,927
11
nation comprising, a casing having a bore tenni
nating in a high pressure end, a bushing in said
bore ?tted thereto adjacent the high pressure
end, said bushing having its high pressure end
recessed adjacent the bore wall to provide a gas
ket seat having at least a portion thereof ar
ranged at an oblique angle to the axis of said
bushing, a gasket ring of deformable material
on said seat with an outside surface engaging
the bore wall, and a plug forced into the bore 10
with said gasket ring compressed between said
bushing and said plug and with the oblique an
gularly arranged portion causing gasket defor
mation for effective ?uid sealing and an increase
in area of gasket seating to determine ?nal plug
location.
11. In a high pressure fluid pump the combi
nation comprising, a casing having a bore termi
mating in a high pressure end, a bushing in said
bore ?tted thereto inwardly of the high pressure
12
end thereof, said bushing being provided with a
substantially ?at shoulder arranged substantially
normal to the axis thereof and an adjacent seat
ing surface conforming substantially to that of
a truncated cone, a gasket ring of deformable
material having an outside surface engaging the
bore wall and substantially parallel outward and
inward faces arranged substantially at right
angles to the axis thereof with one engaging
against said shoulder, and a plug forced into the
bore engaging the other face thereof with the
gasket ring compressed between said plug and
said bushing and the seating surface causing
gasket deformation for effective ?uid sealing,
said gasket ring initially seating solely against
said coned surface whereby said shoulder pro
vides increased area of seating to determine ?nal
plug location.
WARNER T. TABB.
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