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1 Sept- 10, v‘1946' I ' J. 1.; BLOOMHEART 2,407,221 MULTIPLE PURPOSE GAS 6N1? Filed March ‘20, 1944 4 Sheets-Sheet 1 Sept. 10, 1946.‘ 2,407,221 J. L. BLOOMHEART MULTIPLE PURPOSE GAS UNIT Filed March 20, ,1944 4 Shee't‘s-Sheet 2 ’ A703 42 37 C \fllg 4/ 36’ E 3 - E C t c 2 - - 3 . T 3 a I \ ‘ 26 9*" ‘ 14/20 E345 3/ 30 v > _ Z7 ‘2 _§Z> \- “ 46 . - .- \ ‘ - I» J“; > (I) ; gm /5' l4 " ' 97 @123 45 I5 " 33 95 ' 24 I6 . 52 50 A 9/ ' 5/ \ 7/ / *Cé>* , _ 2 70 93 . . 72 /05 1 . - . 1e 73 2 6/ l8 74 =3 @6 ' 22 Fla 2 JauA/L?iawusngz; V Sept. 10, 1946. J. L. BLOOMHEART ‘ _ 2,407,221 MULTIPLE PURPQSE'GAS UNIT Filed March 20, 13944 w M _, 1iFla/l %4/ / 4 Sheets-Sheet s .Sept. 10, 1946., 'J. '|__. BLOOMHEART 2,407,221 MULTIPLE vPURPOSE GAS UNIT Filed March 20, 1944 4 S'heets-Sheet 4' EXP?NS/BLE BELLOU/J :4 45502552. 21mm . Jafml Embed/f New Patented Sept. 10, 1946 2,407,221 UNITED STATE s PATENT. OFFICE 2,407,221 , . ‘l MULTIPLE PURPOSE GAS UNIT John L. Bloomheart, Toledo, Ohio, assignor to - , Martha F. McKesson Application March 20, 1944, Serial No. 527,249 4_ Claims. (01. 128—188) , 1 a 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 2 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 apparatus. ' “ 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 22. _ 7' '. 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 2,407,221 3 4% 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|. 75 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. Exhalation 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. Absorber 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 2,407,221 '5 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 ‘I9. Vaporizer 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 y 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. i 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}; placed. ‘ engaging stem NH. The holding of the valve de Use 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 ' 7 2,407,221 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. 8 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 ether. 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 able. 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 2,407,221 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 10 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. JOHN L. BLOOMHEAR'I'.