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Патент USA US2407221

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1 Sept- 10, v‘1946'
Filed March ‘20, 1944
4 Sheets-Sheet 1
Sept. 10, 1946.‘
Filed March 20, ,1944
4 Shee't‘s-Sheet 2
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Sept. 10, 1946.
Filed March 20, 13944
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4 Sheets-Sheet s
.Sept. 10, 1946.,
Filed March 20, 1944
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Patented Sept. 10, 1946
John L. Bloomheart, Toledo, Ohio, assignor to
, Martha F. McKesson
Application March 20, 1944, Serial No. 527,249
4_ Claims. (01. 128—188)
This invention relates to predetermining the se
lection of a gas or. gases in a respective‘ratio or
quantity, with range for maintaining or varying
the control thereof, more particularly in the ad
ministration uses for- analgesia and anaesthesia,
flow lines indicated therefrom to the various con
trol valves at the valve chamber body.
Pedestal and‘ gas supplies thereto
as well as for resuscitation.
This invention has utility when incorporated
to respond to varying inhalation demands, with
possible de?nite modulation therebetween. The
Fig. ‘7 is a diagrammatic showing of the valves
at the supply region on the manifold, with the
Casters I support spider arms 2 radiating from
a‘ central boss mounting column 3 (Fig. 1). ‘A
depending tubular portion 4 mounts .a head 5'
disclosed equipment therefor conducts the gas or 10 atop the column or post 3., The head 5 is a pri
gases prescribed to‘ respond to volume measure
mary section or supply manifold carrier for the
ment, with rate indication. Efficient and ‘eco
nomical handling may be readily adopted, involv
The major volume ‘gas of supplies whether vit
ing treatment of exhalation gases and return or
reous oxid or oxygen may be each a compressed
re-use of the exhaled gases according to a‘de .15 gas‘of' tank or cylinder 5 having a head valve
sired program. The manifold-carrying head with
1 adapted to be connected thru a reducing valve
the closely adjacent diverse passage controlling
8 to a ?exible duct 9 with a connection or ?tting
valve body set up a panel-approximating instru
Ill to the under side of the after portion of the
ment-board-like grouping of the indicating de
head 5. With a, ?tting, [0 for each gas supply,
vices with the manually operable valves directly .20 these mayconstitute a row across the back under
adjacent to forthwith disclose performance.
side of the head 5. In providing for having sev
Referring to the drawings:
eral gases available; there is rendered readily ac
Fig. 1 is a general side-elevation of the com
cessible awide range for adaptations for use.
prehensive unit embodiment, with parts broken
An instance consistent with the set-up herein dis‘
away; the set-up being of a portable apparatus 25 closed may be for supply of nitrous oxid at the
for anaesthesia administration in hospitals or
left (Fig, 2) and oxygen at the right. In inter
even in emergency at the location where the pa
mediate these two supplies there may be cyclo
tient requires. service;
propane, ethylene, carbon dioxid and helium.
.Fig. 2 is a plan view of. the unit of Fig. 1, ‘par
Direct nitrous‘ oxid and oxygen
tially in section, of the ‘post-carried head and 30
‘ valve body;
' Fig. 3 is a somewhat diagrammatic showing of
the gas routing or travel thru a flow gage as
The nitrous oxid, from its receiving ?tting II]
at the head 5, has a duct II to a T or branch
?tting l2, with a way It on to a manually oper
carried on the head, the diagram of the layout
able direct flow nitrous oxid control valve It.
forv the flow having top and bottom plans in
This valve 14 ‘as manually opened, say for emer
appropriate register with the intermediate por
gency, or to bring the patient quickly to the de
tion, the sequence being illustrated in the three
sired response, is connected by a duct [5 to a valve
sections at the upper portion of Fig. 2.
body It, there to be delivered into a chamber I‘!
Fig. 4 is a view looking down into the absorber
(Fig. 4) to pass on therefrom by way of inhala
vaporizer control valve body, with the top wall
tion duct 18 to a ?tting I9 (Fig. l) . The Y-?tting
removed; and even to a slight extent in portions
.19 has a manually adjustable valve 20. At one
therebelow, to show the flow-interrelation valve
position for the valve 20, the inhalation. and ex
chambers, not only for fresh gas‘ supply, but of
halation‘of a patient at‘ a mask 2| is thru the
exhalation gas modifying control for absorber
valve‘ 29 from and to the atmosphere. At an
handling for carbon dioxide removal, with pos 45 other position of the valve 20, the patient’s
sible supplemental substance supplied by the va
breathing is not independent of the gas admin
porizer, such as ether;
' i .
istration unit, but is now connected up to re
V. Fig. 5 is a fragmentary detail view in vertical
ceive gas supply from the-duct IS. The exhala
section of the absorber valve in the valve body,
tion by the patient at ‘the mask 2| may then be
approximately on'the region medially of the ports
byway. of the ?tting is into an exhalation duct
16, 64 at the upperright quarter of Fig. .4;
Fig. 6 is also a section from the valve ‘body,
approximately in the direction,- of the line I34
extended upwardly to the left across the port Hill,
Fig. 4, showing parts of the vaporizer valve; and
This handling -of nitrous oxid is usually to
establish the desired stage of analgesia or anaes
thesia. For resuscitation, or “bringing back,” at
the oppositeside ‘of the head 5, a manually oper
able valve 23 may connect an oxygen supply tank
for direct oxygen ?ow by a duct 24 to the body 16.
The fresh oxygen gas supply is now in the valve
body chamber IT for ready flow by way of the
The gas from the passage 39 has a top cross
over way 4| to a down ?ow way 42, to a bottom
cross~over 43, thence to a midback short riser 44,
thru a ?oat gage housing mounting ?ow-off pas
sage 45 to a manifold 46 (Fig. 1) having a hollow
inhalation duct I8 and the ?tting I3 and the
mask 2| to the patient requiring attention.
Flow gages
post 41 to mount it upon the head 5 for a flow
connection with a way 48 in the housing 5. The
way 48, as under the upper forward edges of the
The branch ?tting I2 (Fig. 1) for the nitrous
head 5, extends to a delivery ?tting 49 having
has, as its upwardly extending branch, a duct
there in communication with' the chamber l1.
Mixed gas ?ow cut-017
On the body I6 is a manually operable cut-01f
oxid supply, as is the case for the oxygen supply, 10 mounting connection for the valve body l6, and is
25 to a valve housing 26 in which is located a
manually adjustable valve 21 at the base of a
?ow-gage or indicator housing 28. The housing
28 has a front window 29 thru which may be
noted rising ?oat positions as to gage markings
or graduations along (Fig. 2) a minor scale 33
and a major scale 3I. The minor scale 33 may
be for smaller readings, as decimal parts of a liter.
The major scale 3|, even tho of similar overall
length, may be hereunder for a plurality of full
volume units, as say up to ten liters.
The flow directions of travel in this indicating
instrument, one for each of the respective gases,
as passing the manually adjustable valve 27, is
by a passage 32 (Fig. 3) to the lower portion
of an upwardly extending tapering, and in this
instance slightly inclined at the top rearwardly,
way 33. The broken away portions of the hous
ings 28 (Fig. 2) have placements for the passages 30
diagrammatically set forth (Fig. 3). The indi
cating means are ?oats, or light weight objects
which may be poised and shifted according to the
impetus from the moving gas. A ?oat herein is
shown as comprising a base convex portion 34
connected to an upper disk 35 by an intermediate
narrowed or neck portion 36.
The taper for the upward way 33 is for a uni
form slight enlargement in the cross-sectional
areav of the passage. Furthermore, with the top
or upper portion tilted back or rearwardly, say
in the range of 5°, such is su?icient to cause the
convex portion 34 of the ?oat to ride along the
underside wall and the disk 35 to slide along the
upper side wall. The gas ?ow thrust as inclined
upwardly is opposed by the vertical gravity force
component in the resultant balance. The ex
perience is that, notwithstanding the gradual en
largement of the crescent clearance about the disk
35 as it ascends, and the converse crescent en
largement as to the lower portion 34, there is min
imized, if not total absence of, ?utter action for
the top-shaped ?oat.
The disclosure is of a construction for accuracy
in gage measurements for a low ?ow rate, while i
there is available a higher ?ow rate. The larger
?ow rate indicator 34, 35, 36 is in the passage 33.
The upper end of the passage 33 has a cross
over 36' therefrom to a down duct 31, a bottom
cross-over 33, thence to a riser upwardly taper
ing way 39 parallel to but of less diameter than
the way 33. The taper proportioning for the
graduations 30, in tenths of a liter, are for a ?oat
40 in the way 39; and the graduations 3| along
the way 33, in liters, for the float 35, 36, 34. The Li
?oat 40 is of a general similar contour to the ?oat
34, 36, 35, and may be more buoyant as well as
of less diameter. As the ?oat 40 is lifted, say to
full liter height and so poised, it does not close
notched exit from way 39. This gas ?ow to oper- '
ate the float 40 is at just slightly lifting or pois
ing of the ?oat 35, 35. 34, near the lower end of
the way 33. The further gas flow increase, after
the ?oat 43 has fully ascended, now causes the
?oat 35, 35, 34, to rise along the scale 3|.
valve 50 (Figs. 1, 2, 4) having an open or “on”
position 5|, and, at half turn in the selected di
rection therefrom, a closed or “off” position 52.
The valve member 50 extends into the chamber
I‘! of the body I6 and there has ?xed therewith
an eccentric 53 adapted to pull a valve disk 54
against the resistance of a compression spring
55, for thereby positioning the valve disk 54 away
from a seat 56. The valve, as thus normally
open, allows gas flow 51 from the head 5 into
the chamber I‘! in the body I6.
The gas ?ow 57, with or independent of nitrous
oxid direct ?ow I5 or oxygen direct ?ow 24, may
be from the chamber H by way of the inhalation
duct I8 to the mask 2| and from thence by way
of the exhalation duct 22 back to the housing I5.
The duct 22 to the body I6 has its flow into a
chamber 58 (shown at the lower right of Fig. 4),
and thence by an under passage or valve cham
ber way 59 in the lower portion of the body I6
to the underside of a ?utter check valve 60, visi
ble thru a window GI (Fig. 2). The up flow as
lifting the check valve 60' is to an upper chamber
way 62 (Fig. 4i), from which there is ?ow—1ater
ally and down (shown at the middle right of Fig.
4) thru a passage 63 to the underside of a valve
disk 54 (Fig. 5). The valve disk 6-3 may be more
or less open for flow control into a carbon dioxid
absorber or fragment-carrying canister 65, say
of soda lime.
Conservative practice is for carbon dioxid to
contribute to some extent in promoting condi
tions desired to prevail in anaesthesia. In some
proportions, carbon dioxid is an excitant for
respiration. In other proportions, it may con
tribute to the desired stage of analgesia or anaes
thesia. It thus is within the control of the oper
ator to remove all or only a portion of the carbon
dioxid from the exhaled gas.
The absorber usually has at least some slight
heat from exothermic reaction in removing the
carbon dioxid from the gas exhaled by the pa
tient. Additionally there may be some moisture.
Should the moisture carry thru, gas out?ow from
the canister 65 by way of its perforate bottom 56
may at once expand into rebreathing bag 6?’, as
a condensing chamber for a more complete re
moval of moisture, due to the extended outer sur
face. However, a compact assembly is for the
bag 61 to envelop the canister 65. Inasmuch as
the bag is readily removable, there is convenient
access for canister replacement as such degen
erates from a period of use. A minimizing of
condensation or moisture in the equipment is an
important factor for retaining accuracy in valve
performance and the resultant gas supplies.
. The positioning of the valve disk 64 away from
a lower valve seat 68 is to‘ open the absorber, and
toward a valve seat '69 is to check flow of gas exi
‘halation from bypassing the absorber. This
go ‘to theunderside of a ?utter check valve‘ I01,
manual adjustment is eifected thru a knob or
‘visible thru a window I05 (Fig. 2).
' ‘.With’ the valve 50 closed, whether or not the
head ‘I0 (Figs. 2, 5).
knurled head pieces or‘ knobs ‘I0, 9I , be in position
With the knob 10 in register with a position ‘H,
such may be for full “on” for the absorber, that
is, for the full volume of the exhalation from the
to shut off the absorber and rebreathing bag,
and also the vaporizer, there may be exhalation
relief by manually opening a valve I06 in the
mask 2|, duct 22, to the body I6, chamber 58, up
body I6 (Figs. 1, 2).
thru the ?utter valve 60 as shown thru the win
The extent to which the absorber is used may
dow 6|, thence to pass into the chamber 62, down
be recorded, say as to time intervals of ?fteen
to the chamber 63, and as the valve 64 is now in
minutes each, at a ‘scale I01, by a handle I08, at
its fully liftedposition (Fig. 5), the seat 69 is
the top of the valve body I6 (Fig. 2) at the other
‘fully closed and the seat 68'therebelow is fully
side from that for the valve I06.
open. The total exhalation flow is accordingly
, Bellows
down into the canister 65 ‘for the CO2 to be re: 15
0n the head 5 is a handle or knob I09, adapt
moved from the exhalation by the soda lime
ed as freely turned to carry therewith a pointer
charge therein. The CO2 extraction has the re
I I0 over a scale I I I, say in liters (Figs. 1, 2) . Ro
sidual gas therefrom pass out thru the perforate
tation of the knob I09'is effective thru‘ a toothed
bottom 66 into the rebreathing bag 61. "With
disk H2 in mesh with a toothed disk H3 at an
clockwise turning, therefrom to a scale ‘I2 for
angle thereto, thereby to Wind a cable H4 hav
fractional stages to a closed or “off” position 13
ing a, Wrap about the hub of the disk H3. One
(shown in Fig. 2). A still further turning and
end of the cable H4 is connected to a tension
also clockwise to a position ‘I4 is effective thru a
helical spring II 5 ?xed with the head 5. The
lever ‘I5 (Fig. 5) to move a valve disk ‘I6 against
the resistance of a compression helical spring 11 25 other end of the cable II4 has a wrap at an en
largement I I6 ?xed with a shaft I I‘! having ex
to close a seat ‘I8 and thereby shut off or cut out
terior Of the housing or head 5 an upstanding
the rebreathing bag 61. At this fully down posi
arm II8 extending to bellows back section II9.
tion, ‘the valve disk 64 is on the seat 68 and the
Opposite thereto is a ?xed bellows front section
gas flow from the way 63 is bypassing the ab
I20 having a duct way I2I therefrom in the
sorber and going past the seat 69 into a chamber
housing 5 to the way 48. To counterbalance the
bellows, is a spring I2 I ’.
The rebreathing bag 61 may be shut off, in the
A‘ valve disk 60 (Fig. 6) clear of a seat 8I,,allows
gas flow into a wick-carrying perforate cylinder
82 of an ether vaporizer. The cylinder 82 is in
a glass jar or container 83 having a mounting
ring 84 to connect the jar with the underside of
the valve body I6. Along an exposed vertical
side of the jar 83 is a scale of graduations 85
(Fig. 1) which may permit direct reading of the
quantity of liquid, as ether, in the jar 83‘up to a
graduation line. Between the cylinder 82 and
the jar 83 is a chamber 89 into which the vapor
laden gas from the cylinder 82 may pass, and by
a passage 89 in the body I6 to an upper chamber
90 (Figs. 4, 6).
A knurled head 9| (Fig. 2) has a position 93
event such be not a rigid envelop for the absorber,
and‘a de?nitely disclosed rebreathing checked at
the scale ill for the full rebreathing to take
place in the bellows. The knob 109 may be
turned to locate the pointer, say at zero,'in an
adjusted capacity for the bellows. As the varia
tion be plus or minus, the operator may thereby
determine gas reduction or replenishment.
For a minor cylinder or gas supply, as for
cyclopropane, there may be a ring I22 on the post
3 below the boss or tubular portion 4 (Fig. 1).
Fromthis ring I22, an arm I23 may have a,
clamp I24 to engage a valve head I25 of a cyl
inder I26, thereby to be sustained from the post
3 of the portable unit. From the cylinder I26
for full “on”, with adjacent clockwise scale 94
there may thus be "controlled
therefrom for ether proportion reduction to an 50 I23 and therefrom by a, duct
“off” position 95. With the handle or head 9| at
proximate‘parallelism to the
the position 95, a manual valve 91 at a pouring
?ttings I0 to connect at the
funnel 98, may be opened, for volatilizable me—
of the head 5.
gas flow to the arm
I21 lined up in ap
ducts 9 for similar
rear under portion
dium, as ether, to be supplied to the jar 83, there
In the instance of some administration gases,
to be absorbed by the wick in the cylinder 82.
55 condensation may occur. To promote accuracy
The weight of the respective knobs ‘I0, 9| is
in anaesthesia control, advantage arises in pre
carried by compression helical springs 86. Each
cluding such liquid disturbance factors from fur
knob has a depending internally threaded sleeve
ther travel. into the valve regions of the equip
or nut 81. For the knob ‘I0, the sleeve 81 lifts
ment. To this end, the valve housing 26, below
and lowers externally threaded stem 81’. The 60 the flow ‘gage main housing 28, say for cyclo
knob 9| operates to lift and lower an externally
threaded stem 92.
propane, may have a drip tube I20 protruding
from a'hollow depending boss I29 at which is
detachably mounted a glass receiver or cup I30.
As condensation is noted to collect therein, the
cup I30 vmay be removed, emptied and then re
As the disk 80 (Fig. 6) moves clear of closing the
seat 8I, it shifts toward closing a valve seat 99.
The head 9| operates not only the disk 80, but also
a disk I00, which has key against turning or for};
engaging stem NH. The holding of the valve de
vices at the knob ‘I0 from rotation with the knob
The unit as herein disclosed is ‘one which may
10 is e?ected by the lever ‘I5.
With the disk 80 at the seat iii to close the 70 be connected up for the desired gas or gases at
the head 5. With the valve body I6 mounted on
vaporizer intake ?ow, the disk I00, is at a seat
the head 5, and the mask 2I connected by the
I02, to cut off the chamber 90 outflow from the
‘ducts I8, 22, the assembly is complete for han
ether vaporizer, from a chamber I03, whereby
dling'a patient. Exhalation-inhalation cycle is
the gas flow from, or as bypassing the absorber,
may likewise fully bypass the ether vaporizer to 75 disclosed by the flutter valves 60, I04,_t0 be seen
thru the windows GI, I05, in the top of the valve
body It. The cutoff valve 50 may be to clear of
the dosage gases, or to leave the way clear for
direct oxygen supply thru the valve 23, for a
quick come back or resuscitation.
In an emer
gency to anaesthetize the patient, the nitrous
oxid direct flow valve I 4 could be operated.
haled breath before such be returned for inhala
tion. The additive treatment means 82, 83, of the
vaporizer, to the extent used, may be a further
supplemental supply of a relevant substance, as
The control of the apparatus may be set for
fully cutting out the absorber. This is accom
The normal operation of the equipment is with
plished by locating the valve disk 64 (Fig. 5) on
the valve 59 open. The operator may set the
the seat 68 and the valve disk 15 on the seat ‘I8.
pointer H0 at upper mid position when the gas
The result is that the direct or bypassing gas
administration has started.
Whenever the
?ow from the chamber 63 is to the chamber 19,
pointer I I0 shows change, the dosage gases and
as indicated by an arrow I32 (Fig. 4) .
their ?ow rate quantity may be reset thru the
The control may go still further with the treat
valves 21. There may be total bypassing of the
ment means at the body I6. Whether or not the
vaporizer. For administration gas economy in 15 absorber be wholly, partly, or not at all bypassed,
recirculation, the extent of absorber operation
a somewhat similar range of control is available
may be adjusted.
atthe vaporizer 82, 83. As there may be a total
There is an important factor available to the
shutting off of the absorber, as to intake and out
operator in the matter of changing of the cycle
let, such steps may be taken at the vaporizer (Fig.
or swing of the pointer H0 in response to the 20 6). With the disk 80 on the valve seat 8|, the
rebreathing functioning of the bellows. For the
inlet port is closed. With the valve _ disk I00
full exhalation to come back thru the absorber
against the seat I02, out?ow from the vaporizer
to the bellows, the gradual decrease in the bel
into the stream for inhalation is shut off. That
lows maximum capacity position as shown by the
is, the incoming gas ?ow from the chamber ‘I9 is
pointer H6, is a check on the oxygen consump 25 now to a chamber I33 above the valve disk 80,
tion should the apparatus be manipulated with
with the way open therefrom thru the open valve
such end in view. Should the patient be in some
seat 99 for free communication with the cham
stage of analgesia or anaesthesia which it be
ber IE3. This bypassing of the vaporizer is in
desired to maintain, the drop in capacity maxi
dicated by an arrow I 34 (Fig. 4) for the ?ow to
mum as indicated by the rebreathing bellows, 30 the underside of the check valve disk I04. The
may be a clue to hold the patient against shift
rising gas, opening the check valve I04, is now
ing from the condition established and which it
in the chamber IT, to the extent treated or un
be desired to maintain, that the de?ciency should
treated from exhalation, and is now ready to
be made up by the supply of additional oxygen.
?ow from the body I6 by the inhalation duct I8.
In conducting this replenishment, it is in order 35 What is claimed and it is desired to secure by
to avoid introducing such quantity in excess, but
Letters Patent is:
to bring the operation up to swinging the pointer
1. Respiration equipment comprising a head, a
IIIl just to the mid position. In the event the
manifold unit mounted on the head having a line
needle or pointer I II] gets to swinging too far, or
of parallel intakes thereto, a common discharge
to show a capacity in excess, then it is in order
therefrom with an intermediate chamber, a panel
to reduce or out oif the oxygen supply, to bring
provided with individually adjustable controls for
the pointer 'I II] in its cycle back to the selected
gas supplies to the respective intakes for the
limit. Also, the gradual supply of oxygen, even
manifold, a variable capacity gas receiver mount
at an increasing rate, may be adopted for chang
ed with the head and in open communication at
ing from anaesthesia to analgesia, or fully back;
all times with the manifold chamber, an addi
altho for quick response the valve 23 is avail
tional flow control body medially forward from
the panel in the extent of the panel transversely
The quantity or pro-portion of the treatment
of the head, said body being in communication
or anaesthestizing gas or gases may be estab
with the manifold chamber by way of a passage
lished to the satisfaction of the operator with
thru the head, said body including a plurality of
the bringing of the pointer I II) to the upper mid
valve chambers, an absorber unit, and laterally
position. This turning of the knob I09 is against
therefrom, a vaporizer unit, each unit directly
the frictional resistance of the cable H4 at the
and independently upwardly connected to differ
hub of the gear I I3 and is not to operate the
ent chambers from the underside of the body’ to
bellows. However, as the knob is released, the
be there supported by the body, relatively mov
operation of the bellows is effective to shift the
able valves in the body for the absorber and va
pointer IIG. In the event the absorber be not
porizer units, a mask, and in addition to said rela
removing the carbon dioxid, this may be de
tively movable valves, a manually operable single
tected by the gradual increase in the capacity
way valve in the passage from the head to the
disclosed for the rebreathing bellows by the 60 body for restricting gas ?ow from the head to the
pointer I III. Effort should be made to have such
body, and duct means extending from the said
overcome by the absorber. Here as with oxygen
?ow control body to the mask.
consumption, the safeguarding course is by re
2. Respiration equipment comprising a head,
sort to oxygen supply.
a manifold unit providing a chamber having a tu
The counterbalance spring I2 I ’ renders the bel 65 bular discharge post to mount the unit on the
lows sensitive to rebreathing operation. Such in
head, said manifold having a line of parallel in
coming supply of gas or gases as may be deter
takes to the chamber, in alignment a panel-like
grouping of individually adjustable gas supply
mined at the manifold on the head 5, may pass
therefrom to the plural or multiple chamber valve
?ow controls to said intakes, a variable capacity
II, as indicated by an arrow I31 (Fig. 4).
70 gas receiver mounted back of the intakes adja
The integral unit or single body It has ap
cent the controls and in open communication at
pended thereto a plurality of gas treatment
all times with the manifold chamber, an assem
means. The absorber 65, 61, is subtractive, in
bly of indicators on the head for the respective
that it is designed to e?’ect the reduction in the
controls, each indicator with its control and in
closed circuit of the carbon dioxid in the ex 75 take forming an element of the grouping arranged
symmetrically side by side for the extent of the
panel unit, a manually adjustable indicator for
disclosing receiver ?uctuation from a preset indi
cation position therefor, a valve body, there being
a passage from the manifold chamber thru the
head and providing mounting for the body with
the head, exhalation and inhalation passage
means to and. from the body, and independently
relatively movable valve means at the body de
termining gas ?ow thru the body and independ
ent of the head.
3. Respiration equipment comprising a head,
administration gas supply connections independ
ently thereto, said head having a chamber iso
means from the head chamber, ?ow controlling
valve means along said way including a housing
having partitions therein forming passages in said
housing, said partitions being provided with a
pair of aligned ports and a third port, a common
control valve element reciprocable intermediate
the aligned ports, an additional valve element for
the third port reciprocable in parallel with the
other element, and an inter-connected single
control in said housing for moving the elements
into and ‘out of port closing positions.
4. For respiration equipment, a controllable gas
supply including ?ow‘gage means embodying in
a gas ?ow circuit, duct means providing a plu
lated from said connections, a manifold having 15 rality of successive passage-forming sections in a
a chamber provided with a tubular post mount
single connected series, sequential calibration dis
ing connection providing communication between
closing means in distinctive sets along the respec
the head and manifold chamber, an adjustable
tive sections and indicators adapted to have dif
receiver in open communication at all times with
ferent ranges of location in the duct means in
the manifold chamber, valve means from the re 20 successive response to common gas stream ?ow
spective supply connections including gage dis
closing duct means from the different valve means
each into the manifold chamber, gas ?ow way
through the sections.
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