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Патент USA US2375076

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May 1v, 1945-_ l
I
.
Y, M. CASERTA'
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2,375,076
RELIEF AND BY-PASS VALVE ASSEMBLY
,Filed Dec. 4, 194s
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2 sheetsL-sneet 1
N/c/z‘ele Caserta
L May l, [email protected]
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L
M. CASERTA
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2,375,076
RELIEF: ’AN-DV BY-PASS VALVE ASSEMBLY
_
Filed Dec, '4, 1943
2 Sheets-Sheet 2 f
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" .MLC/7de Cade/iwf'.
2,375,076
Patented May l, 194.5.'-
UNITED s'TATi-:s `PATENT orrlci-z-RELIEF AND BVY-PASS VALVE ASSEMBLY
~ Michele caserta, Detroit, Mich., lasslgnor to
ähompson Products, Inc., a corporation o!
Application December 4, 1943, Serial No. 512,891
s claims. (olf. 277-45)
This invention relates to a relief valve and more
particularly to a relief and by-pass valve assembly
for use in pumps such as pumps used for the trans
fer of fuel in aircraft:
v
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’
The present invention constitutes an improve
ment over the valve construction described in my
pending application Serial No. 397,763, ñled June '
12, 1941.
In‘ that application I have shown a
' nested assembly of elements constituting both a
relief valve and a by-pass valve in a fuel pump Io
aircraft.
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FigureG is‘a sectional View taken substantially
along the line VI-VI of Figure 5;
Figure ’7 ls an enlarged sectional, exploded view'
of the relief and by-pass valve assembly showing
_the constituent elements thereof; and
Figure 8 is .a sectional view of a stamped metal
Icy-pass valve disk.
»
`
As shown on the, drawings:
A
The reference` numeral Ill (Figs. 1 and 2) indi
'cates generally an aircraft fuel pump with which
a. relief and by-pass valve assembly of my inven
tion is particularly adapted to be associated. Said
pump lll comprises a pump casing Il, a valve
housing l2 mounted thereon, and a valve housing
ranged as to reduce any tendency of the -by-pass
valve disk to become cocked, hut even if the by 15 cover I3 secured to said vhousing l2 and to the
pump casing ll by means 'of bolts and nuts It.
pass valve disk‘should become cocked, the con
The pump here illustrated ls of the rotary vane
struction is such that it cannot stick in operation.
type, the bore of the pump casing. ll being pro
vThe relief valve is provided internally with 'up-v
According to the‘pi‘esent invention, the relief
and by-pass valves are so constructed and ar
standing, vertical ribs to serve as a guide for the
by-pass valve disk, and the latter, because a disk
like rather than a piston-type element, cannot he
. come stuck even- if it should assume a cocked po
vided with a pump liner I5 within which a rotor
it is adapted to be driven. The pump casing ll
is provided with anintake ll and an outletI lt '
for connecting the pump in a. fuel line-to an en
gine, or other point to which fuel is to be _de
livered. Internally, the pump casing is divided
vided with a depending annular flange for partial
ly enclosing and conñn'ing the upper end of the 25 by a partition lBA, on the intake side of whichV
spring that urges the disk into closed position. ~ is formed a port lll, and on the outlet side of which
isiormed a port Zt both of which are in flow com
The lower, closed bottoni wallet the relief valve
munication with interior portions of the valve
is also upwardly dished centrally ior the purpose
oi centering the lowerlend oi 'the ley-pass valve
Said valve housing it is formed with an axially
concentric, annular partition 2l, which, as best
lt is therefore an important object ci this in
shown in Figures 3 and 4, is integrally cast with
vention to provide a relief and ley-pass valve as
the valve housing it, to which it is connected by
sembly of an improved construction whereby ease
web portions it, it and tt. On the intake side
and certainty of operation are assured and any
35 ci’ the partition tl, in conjunction with the web
danger of the by-pass valve becoming cocked and
it, said partition provides a pair of ports it and
sition with respect to said ribs. The disk is pro
housing li.
spring.
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stuck is practically eliminated.
Other and further important objects of this in
vention will be apparent from the disclosures in
the specification and the accompanying drawings.
On the drawings:
p
y
'
- Figure l is a top‘plan View of a pump with
which my relief and by-pass valve assembly is
particularly adapted to be used;
v
tito that are in communication with the port
it and the ‘intake il. On the outlet side of said
annular partition 2l it is open as at 2t (Fig. 2)
to provide flow communication from the outlet>
port 20 through a port 2l in the valve housing.
to thefìnterior of said WMI-like partition 2l .` The
inner upper edge of sa'. . partition 2| provides a
relief valve seat 23, the full circumference of
Figure 2 is a sectional view taken substantially 45 which is completed by a horizontally ext .ding
along the line II-II of Figure 1, with parts in
Portion `29 of said partition 2l. yThe interior `of
elevation;
«
the valve 'housing iz is thus divided into ¿meer
portion including the port 21 and an upper cavity.
3B. The lower portion ol’ the partition 2l is pro
Figure ¿l is a sectional view taken substantially -50 vided With an open cylindrical bore 3| (Fig. 2)
Figure 3 is a sectional View taken> substantially "
-along the line III--III of Figure 2; .
along the line ïV-IV of Figure 2;
Figure 5 is an enlarged sectional view taken
along a plane passing through the axis of the re-'
lief and lay-pass valve assembly, removed from the
pump housing;
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of reduced diameter, for a purpose that will later
appear. AA gasket 32 having openings conform
ing with the ports I9 and 20, is suitably positioned
between the pump casing H and the valve hous
ing I2 for providing a tight joint therebetween.
2,375,076
Y 2
The lower annular edge of the partition 2| rests
atively very light, being merely suñlcient to hold
the by-pass disk 41 against its seat when the iiuid
' -directly upon said gasket 32. which is clamped
betweensaid lower edge land the partition IBA
of the pump.
pressure above and below the by-pass disk is
substantially the same. said by-pass disk 41 is
depressed to permit the fuel to continue in its
flow through the opening thereby provided and
out through the ports 43, 21 and 2U to the outlet
`
A relief and by-pass valve assembly, indicated
by the reference numeral 33 (Fig. 5) is adapted
to be assembled in nested relationship within the
valve housing I2. Said assembly comprises `a
side I8 of the pump casing.
'
relief valve 34, suitably formed of a metal stamp
In the operation of the by-pass disk 41, there
ing with an upper, outturned cylindrical iiange 10 is no tendency of the disk to become cocked and
35 in sliding contact with the cylindrical bore 36
stuck, since the outer peripheral surface 43 is
formed in the upperportion of said valve hous- ‘
rounded (Fig. 7) to give the effect of a thin cir
ing I2, and with a lower closed bottom portion
cular disk rather than that of a piston. Further
.31, having an upstanding cylindrical side wall 33
more, the coiled spring 45 acts against the under
slidable within the bore 3l. Said relief valve 15 side of said disk with a pressure that is uniformly
34 is further formed with an intermediate offset
distributed about its complete circumference and
portion 35, provided on its outer surface with a
adjacent its outer periphery. The "spring 45 is
beveled seating face 40; and on its inner surface
itself centered by the upstanding central portion
with a flattened shoulder 4|. Above the offset
44 in the closed bottom 31 of the relief valve 34
portion‘39, the side wall of the relief valve 34 20 and its top winding 'is confined within the de
is provided with ports 42, while ports 43 are formed
pendent ?lange 49 of said b_y-pass disk 41, so that
in the lower side wall. The bottom wall 3l of
the spring cannot easily bev displaced. In addi
said relief valve is provided with an upwardly
tion, the amount by which the spring 45 can be
dished central portion 44 for the purpose of cen
compressed is limited by the lower dependent
tering a coiled‘spring 45, adapted to rest there 25 iiange l49 of the by-pass disk 41 striking against
on. The lower side wall of said relief valve 34
the closed bottom wall 31 ofthe relief valve 34,
is provided with inwardly extending ribs 46, which
' so that the spring 25 can never be compressed be
are parallel to the axis of said relieî valve and
yond its elastic limit.
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which serve for guiding a by-pass valve disk 41,
As a'matter of fact, the movement of the by
as will later be explained in greater detail.
30 pass disk 41 is very slight in actual practice, since
The by-pass valve disk 41 is formed with an
the opening that is uncovered is of such large
upper disk-like portion presenting an outer pe-.
diameter as to permit substantially unobstructed
riphery 48 for sliding engagement with said ribs
flow of the fuel upon slight depressiony of the
46, and with a lower dependent annular flange 49
by-pass disk.
for partially enclosing and confining the upper
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Between the valve housing cover |3uand the
valve housing I2, a diaphragm 58 is clamped about
end of said coiled spring 45. The by-pass valve
disk 41 is also provided, on its upper face, with a
its periphery by the same‘bolts I4 that hold the
pump casing II, valve housing I2 and cover I3
together. With the relief valve 34 properly
explained.
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40 seated, the upper face 59 of said by-pass valve 5I
In Figure 8, there is illustrated a stamped
extends into ktouching contact with said dia
raised, fiat annular surface 5I) which constitutes
the seating surface of the disk, as' will later be
metal disk 41a having parts corresponding to
phragm 58.
those of the 'valve 41 designated by the same
reference numerals with the subscript a.
A lay-pass valve 5I is adapted to be nested with
in the relief valve 34 to provide a seat for the
bY-pass disk 41. Said member 5I is formed with
a dependent annular flange 52 having 'an outside
diameter equal to the diameter of the circle de
A stamped metal washer 60I is positioned above
said diaphragm 58 to-rest thereagainst with its
downwardly oiîset peripheral portion 6I opposing
the upper annular surface 59 of said by-pass
fined by the inwardly extending ribs 46. The
lower surface of said flange 52 provides a plane
annular face 53 against which said by-pass disk
41 is adapted to be urged by the spring 45. Above
said dependent annular iiange 52, the by-pa'ss
valve 5I is provided with an'annular shoulder
54, the bottom face 55 of which is plane and
adapted to rest upon and be supported by the
shoulder 4I of the relief valve 34. A thin washer
56 of iiexible material, may suitably be positioned
between the shoulders 55 and 4I to insure a seal
therebetween. The upper portion of the by-pass
valve 5I is provided with a plurality of radial
ports 51 for permitting free iiow of ñuid from
the upper chamber 30 through the ports 42 in the
relief valve 34 to the interior of said relief valve
5| above the by-pass disk 41.
.
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Thus, in casethe rotor I6 is not operating and
it is necessary to by-pass said rotor, the fuel can
be caused to ñow under pressure, as by means
of an emergency hand pump (not shown), up
through the port I9, through the corresponding
ports 25 and 25a in the valve housing I2, through
the ports 42 in the relief valve 34 and through
4.
valve 5|.
,
Said disk 60 is further formed with a
semi-spherical, centrally depressed portion 62 for
A second stamped metal disk
64 is formed with a complementary semi-spheri
cal portion 65 which rests against said ball 63 to
be centered thereby. Said disk 64 is also pro
vided with a downwardly oiiset peripheral por
tion 66 which forms a seat for the bottom turn
. of a regulating spring 61 for adjusting the pres
sure against said diaphragm 5"
The regulating mechanism icludes a screw 68,
which is adapted to extend through an opening
' 69, centrally positioned in the top of said cover
UIL I3. _Said screw 68 is provided-with an integral
flange 10, between which and the underside of
the cover I3 is positioned a gasket 12. _A check
nut 13 serves to draw the flange and gasket tight
ly up against the under surface of the top wall
of the cover I3 to provide a fluid-proof seal. A
flanged disk 14 is operatively threaded upon the
lower threaded end `of the screw 68 and is pro
vided with an offset peripheral iiange 1,5 for
,bearing against the upper end of the coiled spring
61. For the purpose of guiding said disk 14, a
‘ receiving avball 63.
plurality of longitudinally extending integral ribs
'I6 are formed on the inside of the side wall of
said cover I3, and the peripheral iiange 15 of
the ports 51 in the relief valve 5| to act against
said disk 14 is recessed as at 1.1 for sliding en
the by-pass disk 41. Since the spring 45 is rel' 76 gagement with said ribs. ‘I‘he screw 68 is further
2,375,076
valve structures of my invention should be ob
served. With the valve housing l2 open, it is
provided with a. screw-driver slot 18, bymeans
of which the desired adjustment can be made
from the outside, without removing the cover I3
or any accessory thereto.
merely necessary‘to drop the various elements
making up the assembly into place in "proper
order, ñrst the relief valve proper 34, next the
’
To _accomplish the adjustment of the' regulating
spring 61, and thereby regulate the amount of
spring 45 and the by-pass disk 41, and finally the
by-pass valve 5I. The gasket 56 can be c'on
'veniently slipped over the lower annular flange
pressure exerted downwardly against the dia- .
phragm 5B, it is merely necessary to loosen the
52» of the seat member 5I, before the latter is `
` check nut 13 and turn the screw 68 in the desired
dropped into place. Because of the guiding and
>centering means provided, the parts nest into
their assembled relationship without any partic
ular care being required and without the neces
direction. By virtue of the threaded engagement
between the disk ‘lll and the threaded portion of
the screw t8, said disk 14 will be moved upwardly
or downwardly to lessen or increase the compres
, sion force of the spring 6l. The slidable engage
sity »of using any special tools to effect the
ment between the ribs 16 of the cover I3 and the
slotted periphery 'Il of the disk 1.4 prevents said
assembly.
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Features of the pump construction here illus
trated but not claimed are described and claimed
disk lt from turning and insures a positive down- '
ward pressure against the spring 6l.
3
t
in my copending application entitled "Rotary
,
pump,” Serial No. 480.278, filed March 24, 1943.
Furthermore, any tendency of one end of the
It will, of course, be understood that various
spring tl to'be deflected from the horizontal due- 20
details of construction may be varied through a
to movement of the disk 14 is neutralized by rea
wide range _without departing from the princi
son of the free mobility of the disk 64 about the
ples of this invention and it is, therefore, not the
ball td. As a result, only the axial component
purpose
to limit the patent granted hereon other
of the tension of the spring is transmitted, with
out any interfering factors, through the disk t4, 25 wise than necessitated by the’scope of the ap
pended claims.
the 'ball 63 and the disk 60 to the diaphragm 5t.
What I claim is:
.
The downward pressure on the diaphragm is
1.
A
relief
and
lay-pass
valve
assembly,
com
further transmitted through the by-pass valve 5l
prising a relief valve member having a closed
to the relief valve til, through the gasket 5t,
and a ribbed lower cylindrical side Wall
whereby the relief valve is held against its seat 30 bottom
provided with ports, a by-pass valve nesting in»
with the desired Ipressure.
.
If it is desired, the interior of the cover it `may
be connected through a bore, shown in Figure 1
to be closed by a plug it, to the supercharger.
When so connected, the pressure upon the dia
phragm 5t varies in accordance with the pres
sure developed in the supercharger and is inde
pendent of circumarnbient air pressure.
ln the‘ operation of the pump illustrated here
in, the relief valve 3d is prevented» from “chat
tering” by reason of the dashpot action brought
about by the construction shown. lSince the relief
valve is provided with a closed bottom 3l, and the
lower portion of the relief valve has a sliding nt
within the bore Ell, this dashpot action is set up
beneath said closed bottom 3l during movement
of said relief valve either upwardly or down~
wardly. The relief yvalve ttl is also held against
misalignment by reason of the upper cylindrical
guiding surfaces >t'b which have a sliding fit with
the internal wall of the valve housing l2, and by
the lower cylindrical side wall 3d of said relief
valve that has a sliding fit in the bore :il provided
by the partition tl.
_
side said relief valve memberand providing an
_ annular seat, a by-pass, disk slidable along said
ribbed side wall for- seating against said annular
35
seat, and a spring confined under compression
between said closed bottom and said by-pass disk
to urge the latter against said seat. 4
2. A relief and lov-pass valve assembly, com
prising a relief valve member having a closed
bottom and a ribbed lower cylindrical side wall
provided with ports, a ley-pass valve nesting Kin
side said relief valve member and providing an
annular seat, a by-pass disk slidable along said
ribbed side wall for seating against said annular ,
seat and having a` lower annular skirt, and a
spring confined under compression between said
closed bottom andV said by-pass 'disk within said
skirt to urge the latter against said seat.
3. In a. relief and by-pass valve assembly, a
stamped metal relief valve member having an up
wardly dished closed bottom, a by-pass valve
nested within said relief valve member to progA
vide an annular seat spaced from said bottom, a
‘by-pass disk within said space having a dependent
By virtue of the construction above described,
the pressure of the fluid delivered by the pump
annular skirt, and acoiled spring centered by said
dished bottom and confined at the top by said
annular skirt for urging said ‘oy-pass disk. against
can be maintained at that desired.4 .In case the
said seat.
pressure tends to build up beyond that for which
the relief valve is set, the fluid pressure acting
upwardly against ‘the offset portion [email protected] of said
relief valve 3d and against the _under `side of the
byßpass disk ¿ll will tend to lift the relief valve
td off of' its seat 23', and fluid will pass into the
cavity td and through the ports ¿l2 and lil into the
port lil on the intake side of the pump. Fluid
also passes through the port t3 in the lower por
tion of the relief valve 3ft and out through the
opening provided when the seat 2t is uncovered.
Since the opening provided when the valve 3d is
lifted off of its seat 28 is of relatively largeldiam
eter, the valve need b'e lifted only slightly to
provide for the flow of a 4considerable volume of
the fuel from the outlet to the intakeside of the
pump.
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_
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The ease of assembling the relief and by-pass
.
4. In a relief and by-pass Valve assembly, a
stamped metal relief valve member having an up
wardly dished closed bottom and a vertically
ribbed cylindrical side wall extending therefrom,
a lay-pass valve nested within said relief valve
member to provide an annular seat spaced from
said bottom, a by-pass disk within said space
guided by said ribbed side wall for movement'
therealong and having a dependent annular skirt,
and a coiled spring centered by said dished bottom
and conñned 'at the top of said annular skirt for
urging said by-pass valve against said seat.
5. A relief valve comprising a stamped metal
cup-like member having a closed bottom, an inter
mediate external seating surface and upper and ’
. lower ported cylindrical‘side walls, the lower of
said side walls being provided with vertical inter
nal ribs for guiding a by-pass disk.A
.
_as
2,875,076
6. A relief valve comprising a stamped metal
cup~likemember having a closed bottom, an inter
mediate external seating surface and upper and
lower ported cylindrical side walls, the lower of
said side walls being provided with vertical in
ternal ribs for guiding a by-pass disk and said
bottom being upwardly dished centrally to center
>the lower end of a coiled spring to be positioned
thereon.
»
7. A relief and by-pass valve assembly com
priaing a stamped metal cup-like relief valve mem
ber having a closed bottom, an intermediate ex
ternal annular seating surface, and rupper and
lower ported cylindrical side walls, the lower of
said side walls being provided with vertical in
ternal guiding ribs, said bottom being upwardly
dished centrally, a ported by'-pass valve nested
pendent annular skirt, whereby to urge said by
pass disk against said lower annular seating sur
face.
8. A relief and by-pass valve assembly comprising a stamped metal cup-like relief valve member
having a closed bottom, an intermediate external
annular seating surface, an internal annular
shoulder and upper and lower ported cylindrical
,side walls, the lower of said side walls being pro
vided with vertical internal guiding ribs, said
bottom being upwardly dished centrally, a ported
by-pass valve nested-within said relief valve to
rest upon said internal annular shoulder and hav
ing a lower annular seating surface, a by-pass
disk having an upper peripheral annular surface
for seating against said lower annular seating sur~
face, a thin disk-like outer surface for guidance
along said ribs and having a lower dependent an
nular skirt, and a spring between said by-pass
within said relief valve and having a lower annu
lar seating surface, a by-pass disk having an upper
peripheral annular surfaceI for seating against 20 disk and said bottom centered by the upwardly
said lower annular seating surface, a thin disk
dished central portion of said bottom and con
like outer surface for guidance along said ribs _and
ñned within said dependent annular skirt, where
having a-lower dependent annular skirt, and a
by to urge said by-pass disk against said lower
spring between said by-pass disk and said bot
tom centered by the upwardly dished central por-
tion of usaid bottom and confined within said de- -
V annular seating surface.
MICHELE CASERTA.
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