US1620881A

US1620881A - Fluid-controlling mechanism

Info

Publication number: US1620881A
Application number: US424144A
Authority: US
Inventors: Fisher James Powell
Original assignee: Doherty Research Co
Current assignee: Doherty Research Co
Priority date: 1920-11-15
Filing date: 1920-11-15
Publication date: 1927-03-15
Anticipated expiration: 1944-03-15

Description

J. P. FISHER FLUID CONTROLLING MECHANISM March 15, 1927a 2 Sheets-Sheet 1 V I I o 7 March 15, 927 J P. FISHER FLUID CONTROLLING MECHANISM 2 Sheets-Sheet 2 Filed Nov. 15, 1920 Patented Mar, 15, 1927.

UNITED/STATES,

JAMES POWELL nrsnnn, or BARTLESVILLE, OKLAHOMA, ASSIGNOR, BY MESNE AS- SIGNMENTS, 'ro nonnn'rvnnsnnncn COMPANY, on NEW roux, N. Y.,-A conrona- TION OE DELAWARE.

FLUID-CONTROLLING ECHAN SM. a

Application filed November This invention relates to fluid controlling mechanism and more particularly to mechanism adapted for use in a gas distributing system to limit the quantity of gas which may flow through the individual service lines and to regulate the pressure of the v either'through accident'to a service line or because of abnormal demand on the part of theconsumer, gas might be taken from the supply mains along the line in quantities many times greater than the normal demand on the line. Manifestly, such an ex cessive demand might occur simultaneously on a number of service lines. Under such conditions, in order, so far as possible, to

sumers at all times, it has been necessary to maintain relatively high pressures in the supply mains, entailing greater leakage and loss of gas than Would occurat lower pressures. Moreover, damage and annoyance have often been caused to consumers, more especially to. those who derive their supply of gas from portions of the mains relatively remote from the source of supply to ,the

mains. through inability to obtain a normal supply of gas by reason of excessive demands on the part of other consumers.

Gas distributing systems are commonly divided into districts, each having a. regulator for determiningthe pressure at which gas is supplied to the, district mains. The ,district mains are preferably large enough so that an adequate supply of gas may be delivered to each consumer with relatively low 7 pressure in themains. When, however, the Z'I district malns are small in proportlon tothe demand on them, it is necessaryto maintain the gas at the district regulator under high pressure with large difl'erential at times of I I- extreme use ofgas between the'pressure or the gas at' the regulator and that onsfer 'ce insure an adequate supply of gas to all con 15, 1920. Serial no. 424,144.

lines remote from the regulator.. In such cases, the pressures of the gas in portions of the district mains is too great to permit it to be satisfactorily burned for most poses" including household use.. 5 It is an object of the invention to provide mechanism which will limit the demand on the service lines of a gas distributing 'sy's-Q tem, and which willre late the pressure},

of the gas in the service l nes'to'the end that,

each consumer served by thesystem may be] assured at all times of a normal supply of. gas at a pressure-best suited to his requirements. f

With the above'mentioned object in view, an important feature of the invention comprises-a housing constructed to allow fluid such, for example, as natural: or artificial gas, to pass through it and containing means -r controlled by the fluid for limiting the rate 170 of flow of fluid through the housing and regulating thepres'sure at whifih the fluid is{ delivered from the housing,

v In accordance with a further feature the invention, means 18 provided for causing 7 a drop in pressure of fluid alas it passes through a housing or other fluid conductor, together with means for utilizing the pressure differential on opposite sides of the'firstmentioned means to controlthe rate of flow: 1

of fluid through the conductor and means for regulating the pressure at which the fluid issues from the conductor. In the illustrated construction, .the flow -of the fluid is-"controlled. by a valve, and mechanism is provided for operating the valve =both in accordance with the pressure difi'erential of the' fluid at certain points in the. conductor, and in.aceordance with the pressure of the fluid on the deliveryside of the conductor. I r l Another feature of the invention pertains to the rovision in a fluid conductor of a valve or controlling the flow of fluid through the conductor and a lpair of diaphragins operable to control e valve se lectively and independently in accordance with varying conditions of flowof fluid "through the conductor. As sho'wn,the diaphragms are joined the valve by lost mopur-- i' the other diaphragm.

A still further feature of the invention'resides in a fiuid conducting' housing contain- 'ing a T controlling valve, adiaphragm to which the valve is operatively connected, and

an orifice disk for inducing drop in pressure of fluid passing through the housing, the housing being constructed to cause pressure directionlof the arrows;

trolling device embodying the preferred form or the invehtionf I of ig. '1,

of the arrows;'

the diaphragm chamber difi'erential' on opposite sides of the disk to transmitted to opposite sides of the diaphragm so that the valve is made to control the How of fluid through the device in accordance. with the pressure difierential' produced by the orifice disk. 7

Other objects and features of the invention will appear as the description proceeds and will be pointed out in the In the drawings,

appended claims;

Fig. 1 is a View lnplan of: a fluid con- Fig. 2j, is'a view in elevation on line 2-2 looking in the direction of the arrows;v 11;.

Fig. 313a view in elevation of the device takenonthe line 3-3 of Fig.2, looking in the-direction of. the arrows;

Fig. 4 is a view in elevation'of the double poppet valve;

1g. 5 is a sectional plan of the valve on line 5--5 of Fig. 4, looking in the direction Fig. 6 is a sectional plan of the-valve on: line 6-6'ot Fig. 4, looking in the direction of the arrows Fig. 7 is a top plan view of the valve cage'; Fig. 8 is; a view in elevation of the valve cage on line 8-8 of Fig. 7 looking in the Fig; 9 is a section through the valve cage on line 9+9 of Fig. 8-, looking in the direction of the arrows; and

Fig. 10 is a view in. sectional elevation of the fluid controlling device in a form in whichit may be employed to control the rate of flow: of gas without pressure regula-- tion. Q f i The illustrated device comprisesia housing 2 constructed to serve as a conductor for gas or other fluid and provided with inlet and outlet openings 4 and 6 respectively. As shown, the frame structure of the housing 2 is shaped inwardly ofthe inleti opeiiiiig 4, to forman inlet chamber Scoinmnnica'ting with achannel '10. --'lhe channel-1O isseparated byan upper wall 12 from the lowers; portion of a diaphragm chamber 14 and by a lower .wall 16 from passages 18 and 20 (Figs. 1 and 3) extending downwardly from v 14 and meeting be low the wall 16. ,1

The

walls

12 and 16 are provided with openings in which is seated a valvejcage 22 (Figs. 8 and 9) comprising upper and

lower rings

24 and 26 respectively joined integrally by bars 28 spaced apart to afford passages 30 between them. The passages 30 allow gas to flow from the channel 10 to the interiorofthe valve cage, and

ports

32 and 34 locatedpentrally of the rings 24 and'26 respectively permit it to pass upwardly and 14 both directly and through the passages" 18 and 20. Preferably, and inthe illustrated downwardly from the valve cage, thus estabconstruction, the upper ring 24 of the valve I cage 22' is provided at its top with anoutwardly projecting flange or rim 36 constructedto fit into a circular channel'38 on" the'upper side of the wall 12 and is formed below the flange 36 with external screw threads adapted for meshing engagement to match a correspondingly sha ed groove in the wall 16. This constructionhfenables the valve cage to be firmly secured in place in the housing 2 but renders-it capable of sired." In order to facilitatesthe removal 1 of the valve cage from the housing, the upper ring 24 may be formed with inwardly extending cars 42 provided with sockets 44 adapted'to receive appropriatelyshaped ele ments on a spanner wrench or the like.

. The housing '2 is formed to provide; an outlet conduit comprisinga chamber 46 communicating with the outlet opening 6 and demarcatedfrom thechannel' 10 and

passages

18 and 20 by a wall 48 and from the diaphragm chamber 14 by a .wall'50. An

opening52 in the wall 50 allows gas to pass.- from the diaphragm chamber to the outlet ch'amber4'6. From the'foregoing, it will be understood that the course followed by gas llU or downwardly through theport'34 and upwardly through the passages'l8iand 20 to the diaphragm chamber; and then through the opening 52 in the wall 50to the outlet chamber 46 and oulct opening 6.

As hereinbefore indicated, means is provided both for limitingthe rate of flow of fluid through the housing 2 and regulat-' ing the pressure at which fluid is delivered trom the housing. Preferably, and as shown,

res

suchmeans includes a balanced poppet yalve 54 (Fig. 4) comprising a sleeved ,portion 56 pinned to a stem 58 and formed with horizontally disposed

circular flanges

60 and 62 operable upon upward movement of we valve 54 to close theports 32 and 34 respectively. The contacting'surfaces of the

rings

24 and 26

andthe flanges

60 and 62 of the valve 54 are bevelled to insure smooth action of the valve. Vertically disposed Wings 64 projecting outwardly from the. sleeved portion 56 of the valve intermediate between the

flanges

60 and 62 and above the flange 60 guide the valve in its up and down movements and tend to efi'ect uniform flow of gas throughoutthe area of the

ports

32 and 34. The housing 2 is preferably provided below the valve 54 with a screw plug 65 allowing access to be had to the valve.

In order to cause the valve 54- to control the rate of flow of gas through the housing 2, utilization is made of the principle governing the flow of fluids whereby if flow is restricted at a point in a fluid conductor, the withdrawalpf fluid from one side of the point of restriction will cause thejpressure of the fluid on that side to become less than the pressure on the op osite side of the l point of restriction.

'-flow of fluid is thus restricted," the more oreover, when the rapidly it is withdrawn from the conductor, the greater is the pressure differential on opposite sides of the point of restriction.

' In the illustrated construction, the means for applying the enunciated principle ineludes a .disc 66 inserted in the opening 52 of the wall and being formed in turn v with an orifice 68 of relatively small size so as to allow only a restricted flow of gas from the lower portion of the diaphragm chamber 14 to the outlet chamber 46, and

' thereby cause a drop in pressure in the outlet chamber 46 as gas is withdrawn from I the housing through the Ou l Opening A diaphragm 70, clamped, preferably. be-

tweenthe'upper portion of the housing 2 and a ring 72, also constituting part of the I housing, is subjected on its under side to the pressure of the gas on the supply side of the orifice disc 66, and a conduit 74 leading from: the. outlet chamber 46 communicates iwith' the interior of the ring 72 above the diaphragm 70 so as to transmit thepressure ofythegas in the outlet chamber 46 to the upper side of the diaphragm. The floor of the outlet chamber 46 is formed with an opening I normally closed. by a plug 75.

portion of the diaphragm is a smaller plate 78. An eye 80 is set centrally in the diaphragm and

plates

76 and 78 and is flaredoutwardly at its ends to secure said parts 'together.- The valve stem 58 extends upwardly from the valve 54 and passes loose- 1;; through the eye 80, being provided above the eye with an enlarged portion 82 of larger diameter than the opening in the eye f The weight of the

plates

76 and 78, valve 54,-and valve stem 58maintains the diaphragm 70 normally depressed. thus allowing the valve 54 to occupy its fully opened position. When, however, the fluid pressure on'the under side of the diaphragm is sufficiently in excess of that on the upper side of the -diaphragm to counterbalance the weight of the plates 7.6-and 78,- valve 54, and valve stem 58, the valve tends 't'oaclose.

Passage, of gas through the orifice 68 of I .the diaphragm. In order to prevent the correct action of the valve from being interfered with in this manner, the plate 76 is extended outwardly beyond the vertical plane of the orifice 68, thus reinforcing the diaphragm above the orifice. a

To the end that the valve, 54 may be operatedalso to control the pressure at which gas s delivered from the housing 2, a second diaphragm 84 is provided in t e housing above the diaphragm 70. As s own, the periphery of the diaphragm 84 overrides 86 attachedto the ring 72 by screws or the like 88. A pendant plate 90 and superimposed plates 92 load the diaphragm 84. The

valve stem 58 is provided, at its top with .a head 94 adapted tobe received in a cavity or chamber 95 in the plate 90 of greater the ring 72 and is clamped thereto by a'ring i a cross-sectional dimensions than the head.

The plate 90 is, formed with a portion under- 1 lying the head 94 and provided with an opening ofgreater'diameter than the enlarged portion 82 of the valve stem. 58 to allow the valve stem to. be raised independently of the plate 90'or diaphragm 84. With this construction, however, when the diaphragm 84 is raised, the valve 54 will also be raised. A plug 96 closes the chamber 95 to prevent the passage of gas about the valve stem 58 to the space .above the (liaphragm 84 and co-operates with screws 97 in attaching together the

plates

90 and 92 and the diaphragm 84. The top of the housing is preferably provided with a cap 98 having openings 99 permitting the upper side of the diaphragm 84 to-be subjected to atmospheric pressure. In the illustrated construction, the ring 86 is formed with two a substantially semi circular grooves in which the heads of the screws 88 are received, and which areseparated by raised portions 100, to which the cap 98 is secured by screws 101.'

some difiiculty was experienced in the commerc al d v l pme t of the illustrated. j

device by reason of chattering of its movable parts under certain conditions of flow of gas through the device. To the end that this objectionable "feature which sometimes attended the operation of the device may be eliminated, the ring 72 is provided -'-with a baflie plate 102 interposed. between the

diaphragms

70 and 84 and serving to define separate chambers for the diaphragms. .The baflie plate 102 is formed centrally with an opening 104 in which the enlarged portion 82 of the valve stem 58 ,is loosely received. The opening 104 further acts to transmit the pressure of the gas above the diaphragm 70 to the under side of the diaphragm 84c. Pref-, erably, and as shown, lugs 106- are cast integrally on the upper side of the bafiie plate 102 so as to preclude the weight 90 from moving laterally to anextent sufficient to cause-injury to the valve stem 58.

lhe manner of operation of the illustrated device is as follows:

' Assuming that the device is installed in a pipe line of a gas distributing system but that there is no flow of gas through it, the

pressure of the gas in the outlet chamber 46 and on the upper side of the diaphragm 70 I equals-the pressure on the under side ofthe diaphragm. Consequently, the diaphragm will be fully depressed and, if the diaphragm 84 is also depressed, the valve 54 will occupy its fully opened position. The gas contained in the space defined by the diaphragmslo and 84 and ring 7 2, of course, exerts pressure on the under side of the diaphragm 84, as ell as on the diaphra m 70. The-maximum allowed pressure of t e gas in the outlet chamber 46 is determined by the weight of the plates 90and 92, valve 5% and valve stem 58, it being apparent that fwhen the pressure of 'gasin the outlet cham- J ber 46 is sufiiciently above atmospheric to counterbalance the weight of the above mentioned parts, the valve 54: will tend to close. The tendency of the valve 54 to close under the conditions specified exists whether gas is or is not flowing through the device. I If -a relatively small amount of gas is withdrawn from the outlet chamber 4:6, for example, by reason of the lighting'of a fevv burnersin a house pipingcontrolled by the device, the pressure in the outlet chamber 46 will be slightly decreased as compared I with that in the lower portion of the diaphragm chamber 14, thus inducing a slight flow of gas-through the device. The'pressure differential in the chamber 46 and the I lower portion of the diaphragm chamber l l is trausmittedto opposite sides of the diaphragm 70. The maximum differential across the diaphragm 70 and, consequently,

the maximum rate of flow of gas through the housing 2 is determined by the weight of the

plates

76 and 78, valve 54: and valve stem 58. and the size of the orifice 68. So

aeeaeer long as" the flowof gas through the housing 2 is below the maximum rate, the diaphragm YO-will not operate to close the valve 5%, which, under such conditions of flow of gas is under the control of the diaphragm 84;. Inasmuch as the stem 58 of the valve 54;

passes loosely through the eye 80 vof the dia phragm 70, the valve may be operated by the diaphragm 84 independently of the ,dia-

phragm 70.

If the consumption or gas from the piping controlled by the device is increased, for

example, by the ignition of'burners or stoves, the maximum difierentialf may be set up across the diaphragm 70, thus marking the maximum rate of flow of gas through the device. The rapid withdrawal of gas tromthe outlet chamber 46 incidental: to the establishment of the'maximum rate or" flow of gas through the devicecauses the pressure in the outlet chamber 4:6 and, consequently,

on the upper and lower sides of the-==dia phragmsYO and fitrespectively to be rela-.

tively small. As a result, the diaphragm ea will occupy its lowermost position under the action of the weight of the parts associated with it. The diaphra 8d operates at all times to prevent the pressure of the gas in the outlet chamber 46 from exceeding a predetermined maximum and further tends, so

longas the pressure on the inlet side of the device exceeds the maximum delivery pressure and the rate of flow of gas is below the predetermined maximum, to maintain the pressure in the outlet chamber 46 at the maximum prescribed pressure, inasmuch as the diaphragm 84: will be depressed in the eventvthat the pressure of the gas in the outlet chamber 46 falls below the prescribed maximum, thus opening the valve 5% more widely and enabling a larger flow of gas through the device.

4 From the foregoing, it will be understood that when the flow of gas through the device tends to exceed themaximum rate determined by the weight of the plates 76and 78, valve 5 dand' valvestem 58 and the size as f of the orifice 68, the upper diaphragm 84 v in the put/let chamber 46 is decreased, at the same time inducing a lower pressure in the lower portion of the diaphragm chamber 14,

However, if at any time the pressure difierelltlll OD. opposite sides of the diaphragm 7( increases beyond that for which the de v1ce is constructed, the valve 54 will tend 'of the demand limit set by it, the result will be to. reduce the gas pressure in the linewithout increasing the rate of flow. Whenever able drop in pressure.

the rate of flow of gas afterh'aving attained.

the maximum degree is reduced below such degree,.the valve 54: again comes under the control of the pressure regulatingdiaphragm 84. v

- In passing through meters, such, for example, as those employed to measure domestic consumption, gas undergoes'a consider- In the use of devices containing valves for controllingt'he flow of fluid and having a valve actuating element or' elements located .directly .in the path of flow of the fluid, it is found,iin the event that the fluid is introduced into.the device at high pressure, that the valve may be prevented from functioning properly by the velocity with which the gas acts on the valve actuating element. An important advantage of the illustrated device is that the gas. Consequently, the device will operate" -'diaphragms are so disposed as .not to be aflected appreciably by any influence other than differences in the static pressure of the satisfactorily either on the inlet or outlet side of a meter, 1

The maximum allowed rate of flow of gasthrough the device may be increa'sedby adding to the weight of the load on ,the diaphragm 70 or'bg ing a larger ori e than the disc previously in use.. "Likewise, the pressure at which gas" is delivered from the device may be increased or decreased by increasing ordecreasing the load on the diaphragm 84.

Incases where the mains are large enough 'to deliver an adequate supply of. gas even though the pressure in them is relatively.

low, it may not be necessaryor advisable to regulate the pressure in the service lines. Under such conditions,-the device of this inventien may be utilized to limit the demand on the lines without pressure regulation.

I To this end, the ring 72-and the parts carried by it, including the diaphragm 84 and cap 98, may be removed and a solid cap 108 substituted therefor, as indicated in Fig. 1() The cap 108 is provided with a duct- 174 analogous to the duct 74 in the ring 72. In this form of the device, the valve stem 58 is fitted tightly into the eye 80 .ofthe diaphragm so as to cause the valve 54 to partake of all of the movements of the diaphragm. The construction and operation v of the diaphragm 70 and valve 54 in' the latter form of the device do not, it is believed, require further explanation, inasmuch as they are similar to that of corresponding under variable pressure.

employinga disc '66 havpartsin the device when constructed to serve both as a demand limiting and pressureregulating device.

' The inventionhaving been thus described,

what is claimed as new andis desired to be secured by L'etters Patent of the United.

pressureof fluid passing through the 'conductor, a valve'forcontrolling the flow of fluid controlling mechanism, a.

fluid through the conductor, means for opersure differential ofthdfluid on opposit sides of the first-mentioned means to limitthe. rate of How of fluid thioughthe conductor, and

ating the valv'ijn accordance with thepresmeans for;regulating the pressure at which fluid is-deliv'ered fromthe conductor.

" .2. A fluid controlling meamn s'm wherein a difference of pressure thereiminfluen'ces devices controllin the'pressu're at which the fluid is delivered herefrom whendeliveringa variableyolume of fluidand in whicha pressure differential ingfluid pass in therethrough influences devices controlling the volume of flow of fluid when delivering fluid 3. A'fluid controlling mechanism having.

devices .for causing a drop in pressure of fluid passing through a'conductor therein and devices adapted to utilize thepressure difl'erential on opposite sides of said first- Inentioned devices to control the flow of fluid through the conductor and other devices for regulating-thepressure at which the fluid is delivered from the conductor.

4. In a combined demand limiting and.

and a second diaphragm operatively con-.

nected to the valve and arranged to be conlivery side of the conductor.

5-. In a combined demand limiting and trolled by the pressureof the gason the del pressure regulating device for use. in gas distributing systems, a conductor forgas, a

valve for controlling the flow of gas through the conductor, and a plurality ofdiaphragms I joined to the valve by lost motion connect tions, said conductor and. lost motion connections being constructed and arranged .to cause the valve to be coritrolledyin, its position by one of the diaphragms under certain conditions of flow of gas through the conductor, and to cause the valve tobecontrolled in its position by another of the diaphragms under certainother conditions of p flow of gas through the conductor.

6. In a fluid controlling mechanism, a]

andto cause the other-side of the second- ;mentioned'diaphragm to be subject to atmos-- phericl pressure only, and connections befluid conductor, means for controlling the flow of fluid through the conductor comprising a valve arranged to approach its closed position when it is raised, a pair oi loaded diaphragms, connections between the diaphragms and the valve constructed to raise the valve uponv elevation of either of the diaphragms, and means for causing each of structed to. cause the the diaphragms to be raised under certain difl'erent conditions of flow, of fluid through the conductor.

7. In a fluidco'ntrolling device, a valve, :1.

pair of diaphragms,mechanism for providing a point of restricted flow of fluid in its passage through the device t'oinduce adr'op in pressure of the fluid, a'housing for the valve, diaphragms and, mechanism,- conf on'tliejsupplyjside oftfieipoint ofrestricted ,fluidion the delivery side of the point of 'strict'ed' fliiw to -fbe transmitted to the othervside of the first-mentfioned diaphra m and flow jtobe. transmitted toone side of one of the diaphragin's',ftotcaiise the pressure of the against one side 50f the [other di'ap ragm,

tween "the diaphragms and the valve constructed to cause the valve to approach closed position upon movement of either of the diaphragms b pressure of the fluid.

' mechanism ;8.In-2i uid controlling device, a valve arranged to approach its closed osition when it is raised, a airof superpose diaphragms,

or providing a point of restricted flow of fluid inits passage through the device to induce a drop in pressure of the, fluid, a housing for the valve, diaphragms and mechanism, constructed to cause the pressure of the fluid on the supply,

side of'the point of restricted fiow to be transmitted to the under side of one of the diaphragms, to cause the pressure of the fluid on the delivery side of the point of restricted flow to be transmitted to the upper side of the first-mentioned diaphragm and against the under side of the other diaphragm, and to cause the upper side of the second mentioned diaphragm to be subject toatmospheric pressure only, and connections between the diaphragms and the valve for causing the valve to be raised upon elepressure of the fluid the conductor, means governed by the pressure difi'erential on opposite sidesqof the disk for contrdllingthe flow of fluid" through theconducton'and means for limiting the pressure at which'fluid is delivered from the conductor; v c

11. In a fluid controlling mechanism, a

fluid condiictor, means formaintaining the ,fluid o'nthe delivery side of the conductor at a predetermined pressure of lesser degree thanthe' pressure of the fluid .on the supply side "of. the conductor, and means for rendering the first-mentioned means, inoperative to maintain the fluid on the outlet side of the condu c'tor" at: such predetermined pressure When they-flow, of fluid through the conductor exceeds a predetermined rate.

F12. Ina fluid controlling mechanism, a

fluid conductor,ja..valve for controlling theflowof fluid through the conductor, means for operatingjthe valve to maintain the fluid on the'delivery 'si'de of the conductor at a v predetermined pressure of lesser degree than the pressurejen-the supply side of the conductor, and 'means'o' erable on-the valve to cause ittolimitlthe' ow of fluid through the conductor to a;- redetermined rate and acting to render-t e1 first-mentioned means inoperative on the valve when the flow of fluid attains "such rate. I

13. In a, combined demand limiting and pressure regulating" device for gas distribut.

ing systems, a conductor or gas, a valve for controlling thepassa'ge of gas through the conductor, adiaphragm for operating the valve to cause gas' to be delivered from the conductor at a predetermined pressure, and

a second diaphragm operable to allow the valve to be controlledby the first-mentioned diaphragm only so'lo'ng as the flow of gas is below a predetermined rate and to limit the flow of gas to such predetermined rate.

14. In a fluid controlling device, a fluid conductor, a valve for controlling the passage I i of fluid through the conductor, and a pair of diaphragms operable to control the 'valve selectively and independently in accordance with varying conditions of flow of fluid through the conductor; a

15. In a fluid controlling device, the combination' with a housing constructed to provide an inlet chamber, a diaphragm chamber, passages extending downwardly from. the diaphragm chamber, ports establishing fluid communication between the inlet chamber and the diaphragm'chamber and passages respectively, an outlet chamber, and a duct leading from the outlet chamber to the diaphragm chamber, of a double valve for controlling the flow of fluid through the ports, a diaphragm operatively connected to the valve and located in the diaphragm chamber below the pointof communication of the duct with the diaphragm chamber, and an orifice disk disposed in the housing ;l'etehamber for causing a drop in pressure inf fluid passing through the device, the arra'ngement-being suchthat the pressure of the fluid on the supply side of the onifice'disk ist'ransmittedto thennder surface of the diaphragm and the pressure of. the fluid in the outlet chamber is transmitted to the upper side of the diaphragm so as to cause the valve to be controlled in its position by the 'difi'erential pressures on opposite sides of the orifice disk. I I

16. In a fluid controlling mechanism, a housing -formed to provide a diaphragm chamber and'an outlet'conduit separated by a substantially horizontal wall, an orifice I disk disposed lh- 'S8ld wall for causing a .drop p'tessure'of fluid passing from the diaphragm chamber to the outlet conduit, a valve for controlling the flow of fluid through the housing, means for 'o crating the valve comprising a diaphragm isposed above and in substantial parallelism with the orifice disk a loadin plate for the diaphragm extending perip erally beyond the orifice in the orificedisk so as-to prevent the portion 'of t. a diaphragm above the orifice disk from beangdraw'n downwardly by suc- "tion arising from the flow of fluid through the orifice of the disk, and means for transmitting the I'BSS IlIB of the fluid in the outlet conduit to t e'u per side of the diaphragm as to cause t e valve to be operated in I accordance with theapr'essure diflerential on opposite sides of the orifice disk. I 17. FInca fluid controlling mechanism, the

combination with a housing constructed to -platefor loading the diaphragm, and lugs provide inlet chamber, a diaphragm I chamber," and assages extending downward- 1y from the-diaphragm chamber, of a valve ,,cage" r'movably seated in the; housing and provided with ports for establishing fluid communication between the inlet chamber and the diaphragm chamber and passages I respectivelfyii a double valve for controlling the flow o I u'id through the ports from the inlet chamber the diaphragm chamber and the passages, a diaphragm in the dia phragm chamber operatively connected to the valve, and means for causing a drop in ressure of fluid passing through the hous-" mg, said housing bein constructed to trans mit the pressure di erential on opposite sides of said means to opposite sides of the diaphragm to cause the valve to be controlled in accordance with such pressure difi'erentiaL. I v s 18. In a fluid controlling device, a valve, a pair of superposed diaphragms disposed above .the' valve, an eye on the lower diaphragm, a stem onthe valve constructed to pass loosely through the eye and progided above the eye with an enlarged portion incapable of passing through the eye, a parts connected to the other diaphragm .and constructed loosely to receive thiupp'er end of the valve stem, a second enlargement on the valve stem adapted to interlock with said part upon upward ihovement of the diaphragm and the part, a nd a housing for the valve and the diaphragms constructed to induce movements of the diaphragms in ac-' cordance with varying conditions of flow of fluid through the device I, a

19. In a fluid controllingfmechanism, a valve, a pair of superposed di'aphragms'dis posed above the valve, an elye o n' thelower diaphragm, a stem on the valve constructed to pass loosely through the eye-and provided above the eye with an enlarged portion incapableof passing! through the eye, a part connected to the other diaphragm and con structed loosely to receive the upper end of the valve stem, a second enlargementon the valve .stem adapted to s 'interlock with said part' upon upward movement of the diaphragm and the part, meansgfoif causing'a I rop in pressure of fluid assing thru the mechanism,-and a housing or the valve, diaphragms', and said means constructed to induce movement of the lower diaphragm in accordance wi h :the pressure difierential on opposite sides of. the said means: and to induce movement of the upper diaphragm in accordance with the pressure at which fluid is deliveredfrom the mechanism. f

20. In a fluid controlling device, a housing constructed to allow 'fiuid to pass through it, a valve for controlling the pa I sage of fluid through thehousing, a dia phragm in the housing, avalve stem for connecting the valve with the diaphragm, a

on the housing arranged to limit the lateral movements of the plate so as to preventinjury to the valve stem. I

21. In a 'fluid controlling device, a hous= ing constructed to allow fluid to pass through it, a valve for controlling the passage of fluid through the housing, a stem vation of the diaphragm, and means for closing the upper end of the chamber to I prev'enhpassageof fluid from beneaththe diaphragm to theupper side or the diaphragm. I I 5 22. In a fluid controlling device, a housing constructed to allow fluid to pass through it, avalve for controlling the [passage of fluid through the housing, a stem on the valve extending upwardly from the valve and pro-' v having an enlargement on its upper end, a diaphragm in the housing, a plate on the under side of the diaphragm'constructed to provide a chamber of larger cross-sectional dimensions than the enlargement on the valve stemto receive such enlargement and a portlon adapted to underlie the enlargement on'the valve stem so as to allow lost motion between the diaphragm and the valve the pressure differential of the fluidjon oppm site sides of said means; a second diaphragm, operatively connected to the valve and arranged to be controlled by the pressure of the fluid on-the delivery side-of the conduc f tor, chambers for the diaphragmsand meansfor establishing fluid communication between the top of one of said'chambers and the bottom of the other chamber.

24. In a fluid controlling mechanism, a" fluid conductor,.a-valve controlling the pass age of fluid through the-conduet0r,-a 'diaphragm connected to the valve, a'-housing for the diaphragm, a baflie inthe housing positioned to divide the housing s c'e into an entrance chamber and a diaphragmfch'amber, each of said chambers having a com paratively large volume, said housin'g'being connected with the outlet" side of theconductor in such a manner that the'onlyentrance of fluid from the outlet side of the. conductor is into the'entrance chamber, and

a restricted opening in the balfle'constituting the sole passage, of 'flu id' from the entrance chamber to the diaphragm chamber.

25. In a fluid controlling device,a housing constructed to; permit fluid to] pass through; it, a valve for controlling the passage of fluid through th housing, a plurality of.

atmosphere an manner superposed diaphragms 'in the housing, lost motion connections between the, diaphragms and the valve, said lost motion connections and the housing-being constructed'to cause the valve to be cohtr'olledby one of the diaphragms under certain conditions of-flow' of fluid through the housin and to cause-the 5 by the other diavalve to be controlled phragm under certain other conditions of floiv of fluid through the housing, andpa baflie plate interposed between the diaphragms.

, 26. In a arranged to approach 'its closed position when it is raised, a pair of superposed dia phragms,zmechanism for providing a point vof restrlct'ed'tiow of fluid in its passage through the device to induce ajdfOELm pressure oithe 'fluid, a housing fort e valve, diaphragms and mechanism, constructed to cause the pressure of the fluid on the supply fiuidfeontrollin'g device, a valve side" of the point/of restricted flow": to be transmitted to the under side of one of the i diaphragms, to cause .the pressure of the fluid on the delivery side of the point of second-mentioned diaphragm to be subject -toatmosphericpressure only, connections betweenlthe diaphragms and the valve for causing the valve to be raised upon elevation of either of the diaphragms, and a bafile plate interposed between the diaphragms.

27. The combination of a gas conduit, valve means governing the flow of gas through saidconduit, a pair of diaphragms controlling said means and having operating connections therewith and one of said diaphragms havin one side exposed to the the other exposed to the pressure of gas from said conduit, and means in the'ip'ath of the gas passing through said conduit for producing a drop in pressure in said ga's,-the other of said diaphragms being exposedon one side to the pressure of said gas after passing through said means.

In testimony whereofI afiix my signature.

' JAMEsPoW LL FISHER.

restricted flow to be transmitted to the upperside of the first-mentioned diaphragm and against thexu'nder side of the other diafphra gm, andto cause the other side of the so