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Патент USA US2406373

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Aug. 27,1946.
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H. E. HElGls
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'2,406,373
TANK PURGING APPARATUS
Filed sept. 19, 1942 `
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2 sheets-sheet ,2
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INVENTOR
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¿Md
ATTORN
Patented Aug. 27,' 1946
l 2,406,373
Y UNITED STATES
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PATENT j-»ÓF?I-CE ï .
'2,406,3ráj-
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TANK PURGING Arraiwrus
’ß ç_.fneilrynrnèst Heig'is, Nutiey, N. „1.,.assignerto4
'__ffSzpecialties Development, Corporation, Bloom.-V
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field, N. .La corporation ofNew’JeI-sey
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Application september 19, 1,942, serial No. 459,022 y
` 21 claims.
1
The present-invention _relates to fuel .tank
.purging and vapor diluting apparatus, and to a
adapted ¿tebe 4.used in :connection with
(Otago-[sci
into `thef»purginglor. .vapor diluting vmedium delivi
<ery conduit :is
prevented.
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. VV'Etre-.fuel„tanks vof military aircraft usually are
qAnother.object
to provide »a iitting of the
foregoing character which «is >automatic «in oper
eration yand requiresrfa `minimum amount of vin
_provided with onehor more )venting 'passages or
spection andrepair..`
such» apparatus.
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openings which _permit the‘rapid escape cf-fuel
vapors vformed vin the tanks, wh'erebyexplosive
ÍvaporY .mixtures Vare ¿minimized or eliminated,
which .are likely -to explode
the. event the
ltanks are pierced `by ¿guniire orlthe like. These
ventingpassages normailylare open, but may be
closed by -a valve~inember„responsive vto :inert-ía
or nthe nsurge of .theiuel `in 4the »tank when .plane
is .eatapuited .into-night or is .brought to a‘sudden
stop While landing, whereby theçspillage'oi fuel
through venting passages is prevented.
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Another object Visto provide -a fitting- of the
foregoing. . character Whichfis readily7 assembled
installed.
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A-¿further object consistsïin- the construction,
arrangement and operation of parts, Wherebyzthe
Y „foregoingtobjects are attained.
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l Other and `further objects of the «invention will
be obviousupon :an understanding .of the-illus
VAtrative»embodiment 4about nto «be described., for »Will
be .indicated .in `the appended claims, and var
ious advantages not referred to herein will occur
It .is customary ’to-further minimize or elim»
to .oneskilled in the-.art uponempleyment of Athe
inate the presence of explosive vapor 1mixtures
invention
.A preferred.
‘inpractice..-embodiment of theÍ~ , inventionhas
.
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Vin the fuel tanks while» the plane is ina combat
area by introducing an inert, »non-combustible
Íbeen- chosen for A.purposes-fof lillustration and: de
gas, such as carbon dioxide, which purges the
scription andois »shown lin .the accompanying
vapor space or dilutes the vapor ’suñiciently to
drawings, forming a part of the specification,
render them non-explosive. Where lsuch. a purg-Y
v,vvhereini¿. n
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ing or vapor diluting medium is introduced into 25 . . Figure l is; _aidiagranimatiel view `-oiî an airplane
tanks having an inertia, or surge operated fvalve,
having ¿fuel tank purging or .vapor diluting appa~
it has been found that the pressure of the me
ratua ¿illustrating .aner'nbodiment ¿of the inven
dium operates the valve to cloee the-venting pas
sages. The closing of the valve Acauses the rne
»Figure .2 .is an -elevation-.al View of a giitting «.u-ïti-l .
tion.:
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dium to build up a pressure in the' tanks which
li-zed in connectionwith-theapparatus shovvn'fin
may eventually burst the tanks, and valso'prevents
Figure
the vapor mixtures from being Yremoved from the
tanks.
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An object of the present invention 'is to provide
a, fuel tank purging and vapor diluting appara
tus which overcomes the foregoing dilliculties.
Another object is to provide an improved ap
paratus, wherein an inert medium’ 'under pres
sure is introduced into the vapor space of a fuel
tank and the pressure of the medium is utilized
for maintaining the vent passage valveA in open
position.
Another object is to provide an apparatus of
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. Figureß .isa bottom _plan View off'the ñtting..
>Figure 4 is ka sectional view taken along the
yline 11-4 ori-Figure 2..
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Figure 5 is a partial sectional `View »taken sub`stantiallv along the yline 5_5 on »Figure 2.
Referring to the drawings, and more particu
larly -to Figure 1. there -is shown an airplane hav
ing a kfuel tank lß in >its fuselage. Adjacent each
end of the tank., a ñtting AIl is Vattached to the
top wall of the tank.. The rñttìngs have an open
ing adapted to vent the vapor `space of the tank
to `the atmosphere .by Way of a conduitß, and
the foregoing character which assures _proper 45 have means for >introducing an inert purging and
vapor diluting medium, such `as gaseous >car-bon
purging or vapor dilution While the plane is in
dioxide under pressure. The fittings ~are each
eight.
provided with. valve member l2. suchas a Hap
Another object is to provide a simple.. com»
per, ‘for closingla ventopeninginthe ñttings in
pact, inexpensive fitting comprising a. vent, an
response >to inertia orV surges ofthe fuel. The
inertia or rsur-ge operated valve -for closing the
fitting at Fthe forward end of the tank is arranged
vent, means for introducing an inert medium,
so that the valve member or flapper IÍ2 closes the
and means for _preventing the valve from closing
vent .opening upon a forward surge of the fuel
'while the medium is Vbeing introduced.
which may occur when the plane is «brought to an Y
Another object is to provide a ñtting of the
abrupt stop whilelanding; and the ñtting at `*the
foregoing character, wherein leakage of the fuel 55 rearward end of the tank’is arranged sovthat its
2,406,373
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erally described, the body 25 houses a piston oper- ~
flapper closes the Vent opening upon a rearward .
surgevof the fuel which'may occur when the
ated plunger 65 adapted to extend outwardlyV
from the body and engage the extension 32 of _the
plane is catapulted into iiight. The, fittings are
flapper to prevent it from closing the venting
flapper from closing the opening while the purg Ril passage. The conduit 2 I is suitably connected to
the body 25 and supplies the purging or vapor
ingor vapor diluting medium is introduced, as
further provided with means for preventing the
diluting medium under pressure which is adapted
will'be described in detail hereinafter. f.
to operate the plunger. Provision -islma'de in ther
The source of the purging'or vapor diluting
body for conducting the medium operating the
medium adapted to be supplied to the tank may
,
>>plunger to an orifice 33A which meters the medium
be a cylinder I4 containing carbon dioxide, which .
into the tank. Preferably the Vorifice 33 is formed
I4 is provided with Ya discharge control heard `I5 Y ’ , in a sleeve38, closed at one end and removably
secured to the body by aV threaded connection. '
, of suitable design adapted to 'be operated in any ._
' is suitably located in the fuselage. . The cylinder
.
Y v,In order to accomplish the foregoing, the body
having
desired amanner,
handle I1forattached
example,
thereto
by ai and
pull mounted
cable: I6 'Y 15 25 has an upper po‘rtion'35 which extends above
the flange 22, and has a lower portion 35 adjacent
theventing body 24 which is adapted to extend
into> the tank. The lower body portion is pro
vided with a chamber<31, which is enlarged at
two pounds perV square. inch above the atmos-`
' _'pheric pressure to which the tank is subjected. 20 its upper end, and _which terminates in an open
ing 40 vat its lower end. "Adjacent the opening, ,
Since the pressure V'of the carbon- dioxide in the
an annular shelf 4I is provided in the> chamber
Y cylinder I4_w may vary between 145' and ‘3000‘
, for supporting Ya flanged bushin`g`42 extending
pounds per square inch, depending upon `atmos
through the opening. A second annular; shelf` 44
pheric conditions, suitable pressure regulating
Yand reducing meansy are provided. y Preferably, 25 is located at the lower end of the enlarged upper
portion of the chamber 31 and la ring-shaped gas
` » these means comprise a pair of pressure regulat
Y ket 45 is supported, which is retained on 4the shelf
ors I9 and 20 connected in series in a conduit 2|
by a cylindrical sleeve 45 ñtted into the enlarged
leading from the'cylinder I4 to the fittingsv I'I.
chamber portion. The sleeve 46 has an'aperture
The ñrst regulator I9 may be adjusted to reduce
the-'pressureat its outlet to atleast 200 pounds,v 30 41 adapted to conduct the-purging or vapor dilut
per squareV inch, while lthe second regulator 20 y ing medium to a passage~49 leading to the orifice
33 for delivering the medium to the tank. In
VVmay be adiusted to reduce the pressure Vat 'its
on the instrument panel.
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During purging or vapor dilution, .it is desired `
that the pressure in the fuel tank does not exceed .
order'to maintain the slèeveïaperture 41 in align- .
outlet tor about ,115`V poundsper square inch. As
ment with the passage 49, a set screw 50 Vmay be »
will be described hereinafter, the ñttingsiII are
threaded through the wall of the body to ñt >into
provided with a metering orifice adapted to re-l`
duce the pressure to labout two pounds per square
inch.
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a notch 5| or recess formed in the sleeve,
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The the upper end of 'the' chamber, av ring
shaped gasket 52 is seated on a shelf 54 and on the
upper end of the sleeve v4e, and a iiange 55 _of a
.
By providing a primary and secondary'regu
lator for regulating the pressure in two stages,
more accurate regulation is attained. Suiiicient‘ 40 disc-shaped member 5_5 is' in turn seated on the
‘gasket 52. A gasket 51 is seatedv on the ñange 55 »
vcarbon dioxide is supplied at all times without
and is engaged by the lower end of a chambered
bushing member 59 threadedly secured in the up
per portion 35 ofthe body 25. The upper end of
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InFigures >2. 3, 4 and 5, the Lfitting II'Y is illus#
ï ,'trated in detail. The fitting comprises a'ñange 45 the bushing member has a threaded connection for
Asecuring the conduit 2 I. f When the bushing _mem
`22adaptedto be securedto the wall ofthetank,
ber 59 _is threaded into position, pressure is ex»
‘and a venting body 24 kand body 25 housing the
danger >ofV bursting the tank due to excessive
pressures . ì
erted on the gaskets 45, 52 and, 51 to form seals
_flapper operating means carried by the ñange
between .thelparts which 'the gaskets are inter
(Figure 2). The ventingbodyis _substantially
tubular and has a venting passage or openingv 2B 50
posed.
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` The disc-'shaped member 55 has a central aper
extending therethrough (FigureA). The upper>
ture 6D into which isV insertedgat its'upper end,
a cylindrical strainer 6I housed in the 4chamber
of the bushing member. This strainer prevents
portionpf the Vventing body extends above the
flange 22 and is in the form of a „threaded sleeve
21 adaptedfoi` connectingÍ the venting conduit 9
thereto. 'I'helower portion of the venting> body 55 foreign matter such as dust or’corroded'metal
particles from reaching the orifice 33 and caus
is adapted to extend into the tank andthe lower
ing it to become partly or completely clogged.
'end thereof is provided with ran, annular lip 29,
_inclined slightly with respect to the horizontal,
against which the ñapper or valve memberV I2 is
adapted to abut to close the venting passage 26.
, As shown in »Figures 2 and 4, the _flapper I'2 is ,
pivotally supported by a rod or pin 30 carried byV
At the lower end of the aperture 59, a downwardly
facing annular valve seat 52' is provided against
which a valve member, about to be described, is
Vadapted to abut;
VThe meansfor preventing the flapper i2' from _
closing the venting passage, comprise ‘the plunger
v`bearings 3l formed at the lower end of the vent
55 located in thechamber 31 of the body 25, one
ing body 24. The iiapperr I 2 vmay comprise a sub-`
stantially fiat member having a surface adapted 65 end of which is adapted to extend downwardly
and >outwardly‘through the opening 4€) and en
to abut the lip 29 to close the ventingpassage,
gage the extension 32 of the .flapperg and apis-V '
and having an arm or extension 32 positioned'be‘
ton 6.6 attached to the other end ofthe plunger
and slidably positioned in the sleeve 45. The
piston is provided with an upwardly facing valve
disc 51 adapted to abut the valve seat Bland
neath lthe bodyzräland adapted to beengaged by
`the.,_i‘lap'pe'r operatingmeans about to bede
lscribed.` The flapper I2 may be provided with a
Vcounterbalancing larm 34 Aadapted to facilitate'
with a downwardly facing annular seater sealing Y
ridge 68 adapted to engage the gasket 45. ,
` The plunger is adapted to be normally main
‘actuation of _the flapper in response to inertia .or
surgeof the fuel. Y
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Y LIn Figure 5, the body 25 housing the flapper
‘operating means is Villustrated in detail.,
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tained in the position'shown in >Figure 5 by a
2,406,373
-‘cylindrical helical spring 69 .telescoped about the
plunger. The .spring is under compression 'and
has one end engaging the underside of the piston
and has itsother end seated on the flanged bush
ing 42, whereby the piston ’is urged upwardly
to Icause the ‘valvedisc 61 to close 'the >opening 60.
‘The piston -and 'the aperture 4.1 inthe sleeve are
-so »related that 'the piston >may be moved down
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boats, armed motor vehicles .and “tanks” ymay be
protected with apparatus substantially .inaccord
.ance with the .invention
From the foregoing description it will ‘be seen
that the present invention .provides :improved
.fuel vapor diluting and purging apparatus. "The
appara-tusis readily operated, and once put into
wardly beyond the aperture 41, whereby .the me
operation, functions automatically. 'The danger
of bursting the tanks is eliminated. The fitting
dium 'under Lpressure .acting on the piston passes
‘through the aperture 41 .and is conducted to the
.orifice 133. When ‘the piston is driven .down
wardly, the .ridge 68 vengages the gasket ~4'5 to pre
vent leakage of the medium through .the opening
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serves .as a'ñapper valve, `a ñapper valve operat
ing means, a check valve, and fa -purging medium
¿introducing means. lThe parts thereof are rugged
.in construction and Acan readily withstand any
'rough usage :to which they may be subjected.
various changes may be `made .in the form,
.inthe operation of the apparatus, the plunger
.65 normally is in its .retracted position, as shown
in Figure 5, and the iiapper is spaced .slightly
away from the lip 29 .of the fventin'g passage 26,
construction andarrangement of the parts herein,
without departing from the spiritzand scope of the
invention and without vsacrificing any of its ad
vantageait is to be understood `that all matter
as shown in Figures 2 and 4. ’In the event the :20 herein is to be interpreted as illustrative and not
plane is catapult-ed into night, a surge of fuel to
in any limiting sense.
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ward .the .fitting .fl I will »cause the flapper to close
VIt is also to be understood that the following
the venting passage. During normal flight the
claims are intended to Icover all the vgener-ic and
flapperzremains spaced away 'from .the passage to
.specific vfeatures of the invention herein Ide
.allow fuel vapors to -pass to the atmosphere by 25 scribed, 'and all statements of the scope of the
way of the conduit 9.
invention which, <as a, matter of language, .might
While the plungei-.is retracted, dueto the spring
69 urging the piston upwardly, the valve Idisc V61
closes the `opening .6.0, whereby >the plunger and
its :associated parts fact las a check lvalve 'for Apre
venting ;fuel from .getting into .the purging me
dium »conduit 2|.
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When the pilot venters :a combat area or .antic
be said to fall therebetween.
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I claim:
1. `In .an apparatus of the class described, Ithe
30 combination of ‘a fuel Átank .having a venting pas
sage, valve means for closing said >passage in re
sponse to inertia or in response to the >surge »of
fuel in said tank -towards .said passage'. a source
ipates `.being attacked, ‘he operates the vapor
of inert mediumunder pressure, .means .for intro~
diluting `or purging apparatus by pulling the 35 'ducing the medium into said tank, and :means
handle ‘l1 .attached tothe .pull :cord ~Hi which .in
associated `with .said last :means ~and operablel vby
turn :operates .to control head |:5 to :effect dis
themedium for preventing .said valve meansffrom
charge of the carbon dioxide or other medium
closing said passage.
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in the cylinder 14. The pressure of the vine
y 2. .Inl an apparatus yof vthe class described, the .
vis ¿reduced ¿by 'the two ,regulators 19 .and 29 .40 .combinationlof a fuel tank having a venting pas
.andfiiows ‘through the .conduit .2| to the .fittings
sage, yalvemeansfor closing said passage in re#
il.; 'The medium enters the bushing member 5B, ` rsponse to inertia or in Vrcsponselto the surger of
<isiiltrere'd or .strained by the strainer 'Bl 'and
fuel in said tank towards said passage, ayzsource
:enters the opening 159) lea-ding to the chamber
of ,inert :medium underpressure, means for'releas
131. The medium is 'effective to unseat the -valve
ing 'the medium from its source, .means for ~introdisc `v6l zand ‘to vdrive the .piston downwardly ¿past
ducing the medium linto said tank, and :means
the aperture '41„ whereby rthe >medium flows :to -the
associated with said .last means .and operable- 'by
vorifice and :is ‘introduced into the tank. The
the medium for `preventing 4said valve means :from
medium is 'effective to dilute or Ídisplace the fuel
closing said passage.
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vapors which may be formed in the space above y.
43. 'In lan apparatus -of the class described, th
the fuel.
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>combinanon :of a fuel tank having a venting
The ilapper Ll2 ’is prevented from closing. the
passage., valve means :for closing said passage
venting ‘passage 26 by therplunger, which, Yas
in response to inertia ‘or in response to the surge
shown in broken lines in Fig-ure 5„-zis now ex
Io'f'fuel.1in-said tank towards >said passage., a source
tended from the body 25 and engages the ex- ,
lof inert medium under pressure, means `-for `intro
tension 32 of the dapper and maintains the nap
ducing lthe medium into said tank -including pres
>per away from the venting opening, thereby per
sureregulating means, `and'mea'ns >associa-ted with
mitting free .passage of the fuel vapors to the
said introducing means and operable by `the me
conduit v9.
dium for Ipreventing 'said valve means .from clos
When >it is desired to restore the system to its 760 ’fing said passage.
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normal condition, the source (of the purging me
4. In an apparatus of the Aclass described, the
dium is disconnected and `t-he »conduit 2| is
:combination of .a fuel tank having a venting pas'
vented to 4the atmosphere. rllhis permits the
sage, valve means in said :tank adjacent said pas»
.spring 69 to yreseat the valve disc 'of the piston
.sage for closing said passage î'n Aresponse to ‘in
and retract the plunger. Thereafter, if the pilot 65 ferïtia Ior .in response to the surge of fuelnln said
lands a't ahigh speed and stops abruptly, a surge
tank 'towards said passage, a container ,of inert
of .fuel is again adapted to cause the flapper to
medium under pressure, means for‘releas’ing the
close the venting passage.
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medium ¿from said container, means ¿for introduc
While the present invention has been described
in »connection with an aircraft fuel tank purging
or vapor diluting .system by Way of example, it
will be understood that the principles involved
»sta-ge pressure regulator, and means operable >by
can be applied to systems for >other craft or ve
hicles 'where itis vdesired to 'purge or :dilute ¿fuel
sage.
vapors.
ing the íinedilnn 'into said ta'nk including a. two
-the medium .introduced into said `-tank for pre
venting said valve means ‘from closing said pas
;5. A .fitting
la venting
forpassage
.fuel tanks
therein,
comprising
~inertia respon
a
For example,V the fuel tanks :of .speed 75 having
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>sive‘valve means for closing said passage, said
»body having asecon'd-passage for introducing a
medium under pressure into a Vfuel tank, and
means adapted to be operated by the pressure
medium ñowing through said second passage for
Avpositioning said valve` means to maintain said
passage
open.
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and a plunger carried by said 'piston adapted to
engage >said valve means and prevent said valve
means from closing said venting passage.
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13. A fitting for fuel tanks vcomprising-body
means having a venting passage therein, inertia
yoperated valve means for closing said passage,
said body means having a chamber provided with
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pressure medium inlet and a pressure medium
6.' A ñtting for fuel tanks comprising a body
outlet and a passage leadinghfrom said outlet and
havingY a -venting passage therein, a pivotally
mounted inertia responsive valve `member for 10 terminating in a metering orifice, a piston in said
closing said passage, and means adapted to be
operated by a pressure medium for positioning
^ >said valve memberto maintain said passage open.
7. Aiitting for fuel tanks comprising a body
having a venting passage therein, an inertia re
sponsive pivotally mounted valve member for`
closing said passage, and a plunger adapted to
bev operated by la pressure medium vfor position
ing said'valvemember- to maintain said passage
open.
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8. A fitting for fuel tankscomprising a body
havingf‘a venting passage therein, a pivotally
-mounted". inertia responsive valve member adja
`eentsaid'passag'e for closing said passage, Vsaid
chamber having a valve member for closing said
inletto shut off communication between said inlet
and said outlet, resilient means for normally 'urg
ing said piston towards said inlet, anda plunger
:15 carried by said piston adapted to extend out of
said body and engage said valve means and pre
vent said valve means from closing said venting
passage.
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14. In a system of the class described,~the com
20 bination of a fuel tank having a venting> passage,
a pivotally mounted valve member for closing said
passage inres'ponse to inertia `or in response .to
the surge of fuel in said tank towards saidy pas
sage, a source of inert'medium under pressure,
valve? member having an extension thereon and 25 means for introducing tne medium into said tank,
and means associated with said last means ladapt
‘a‘counterbalancing arm, means including a pas
sage for conducting Sa medium under pressure
ed to be operated by the medium for preventing
through the fitting, a piston adapted to be oper
said valve member from closing said passage. i
--ated -by the medium, and a plunger on said piston
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adapted to'engage said extension' and position 30 bination of a fuel tank having aventing passage, .
a pivotally vmounted valve member. for closing
said valve member to maintain said venting pas
sageopen;`
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‘ . 9. ‘A fitting for'fuel tanks comprising a body
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said passage in responsev to inertia or in response
to the surge of fuel in said tank towards said Y
passage, a, `source 0f inert medium under pressure,
means having aventing passage therein, valve
~means for closing .said passage, said body means 35 means for introducing the medium into said tank,
and a plunger associated with said `last means
having .a chamber provided with a pressure me
adapted to be operatedïbythe `medium for pre:
.diurninlet and a pressure medium outlet, a, piston f
Y in'said'chamber having a valve member for clos
Y -ing saidlinlet- to shut oiî communication between
»said inlet and said outlet, and a plunger 'carried
by said pistonV adapted to engage said valve means
’ .and prevent said valve means from closing said
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vventing'passage.
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venting said valve! member from -closing, said
passage'
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16. In a system'of the class described vthe com
’ bination of a fuel tank having >a venting passage
therein, a- pivotally mounted inertia responsivey
valve member adjacent> said passage for closing
Y 10. i?ivñttingcforv fuel tanks comprising body
means-having a venting passage therein, valve
means for closing >said passage, said body means
said passage in response to' inertiagor in response
to the surge of fuel in said tank towards said
passage, said valve member having an' extension
having a chamber provided with a pressure me
thereon and a counterbalancing arm, a source of
inert medium under pressure,.means for intro
dium` inletA and a pressure medium outlet and
ducing the medium into said tank, 'a ‘piston- asso
a passage leading from said outlet and terminat
ing in a metering orifice, a piston in said cham 50 ciated with said last means adapted to be op
erated by the medium, and a plunger 'on` said
ber'having a valve member for closing vsaid inlet
piston adapted to engage said extension and posi- '
Y f 'to shut off communication between said inlet and
tion said valve member to maintain said venting
said;outlet, resilient means for normally urging
' said vpiston towards said inlet, and a plunger car
.ried by said piston adapted to extend out of said
vbody means and engage said va-lve means and pre
i vent -said valve means from closing said venting
passage.
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passage
open;
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V17. The combination of a‘fuel tank and a ñt
ting attached to said tank comprising a body hav
ing a venting passage therein, valve lmeans. for
yclosing said passage in response to inertia or in
response to the surge of fuel in said tank towards
having a venting passage therein, a flapper valve 60 said' passage, said body having a chamberfpro
vided with a ‘pressure medium inlet and a' pres
_member- adjacent f said passage for closing said Y
sure medium outlet for introducing the pressure
passage,V said valve member having an extension
medium into said tank, a piston in said chamber
thereonand a counterbalancing arm, a piston
having a valve member for closing said inlet to
„adapted to be operated by a pressure medium, and
shut off communication between said inlet and
aplunger on said piston adapted to engage said
said outlet, 'and a plunger carried by said piston
extension on said valve member and position said
adapted to'engage said valve means and prevent
valve member to maintain said'passage open.
said valve means from closing said venting pas
V12.Y -A fitting for fuel tanks comprising body
means having a` venting passage therein, inertia
18. The combination of a fuel 'tank and a ñt
responsive'valve means-for closing said passage,
ting attached to said tank comprising a body hav
said body- means having a chamber provided with
ing a venting passage therein,- valve means for
pressure medium inletand a pressure medium
Y Y V11.»A fitting for fuel tanks comprising 'a body
sage.
outlet, aV piston in said chamber having a Ívalve
member for closing'said inlet- to shut-.off com
munication between said inlet andsaid outlet',
.
,
"
‘
=
'
_ closing said passage inresponse to inertia or in ,
response to the surge of fuel insaid tank to
wards said passage, said body'having- a chamber
2,406,373
provided with a pressure medium inlet and a
pressure medium outlet and a, passage leading
from said outlet and terminating in a, metering
oriñce, a piston in said chamber having a valve
member for closing said inlet to shut oñ com
sage, valve means for closing said passage, a
source of inert medium under pressure, means for
introducing the medium into said tank including a
'metering oriñce, and means associated with said
last means and operable by the medium to main
munication between said inlet and said outlet,
tain said valve means from closing said passage
resilient means for normally urging said piston
towards said inlet, and a plunger carried by said
piston adapted to extend out of said body and
engage said valve means and prevent said valve
While the medium is being introduced into said
tank.
21. In a system for purging fuel supply means,
the combination of liquid fuel storage means nor
mally conditioned for venting vapors of the fuel
means from closing said venting passage.
19. In an apparatus of the class described, the
combination of a -fuel tank having a venting pas
sage, valve means for closing said passage, a
source of inert medium under pressure, means
contained in said means, fuel operated means ef
fective for sealing said storage means to retain
the fuel in said storage means, external fluid
pressure operated means associated with said fuel
for introducing the medium into said tank, and
operated means for rendering they latter ineffec
tive for sealing said storage means, and means
connecting said external means With the interior
erable by the medium to maintain said valve
of the tank to permit purging of said storage
means from closing said passage while the me
dium is being introduced into said tank.
20 means by the medium for operating said :duid
pressure operated means.
20‘. In an apparatus of the class described, the
means 'associated with said last means and op
' combination of a fuel tank having a venting pas
HENRY ERNE‘ST I-IEIGIS.
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