Патент USA US2404361код для вставки
July 23, 1946.- N. BREWER I 2,404,361 ROTAMETER Filed April 27, 1943 = 67 300: 5 Sheets-Sheet l July 23, 1946. ' N. BREWER 2,404,351 ROTAMETER Filed April 27, 1943 ‘ ~ ' s Sheets-Sheet 2' ' _ July 23, 1946. N. BREWER 2,404,361 ROTAMETER Filed April 27, 1945 ‘I 1 a Sheets-Sheet s _ v Patented July 23, ‘1946 2,404,361 UNITED STATES PATENT ‘OFFICE Nathaniel Brewer, Hat?eld, Pa., assignor to ‘ Fischer & Porter Company, Hatboro, Pa., a cor poration of Pennsylvania ‘ Application April 27, 1943, Serial No. 484,710 1 11 Claims. (01. 73-209) 2 The present invention relates to ?ow-meters and it relates more particularly to ?ow-meters ?cation, appended claims and accompanying of the type commonly referred to as rotameters For, the purpose of illustrating the invention, drawings. ' in which a generally vertical metering chamber there are shown in the accompanying drawings having vertically varying cross-sectional area is forms thereof which are at. present preferred, provided with a Vertically movable “?oat” or since the same have been found in practice to sinker; the position of the ?oat within the cham give satisfactory and reliable results, although it ber determining the size of the ori?ce available is to be understood that the various instrumen- . for vertical flow of ?uid through the chamber talities of which the invention consists can be and being a measureof the rate-of-?ow. 10 variously arranged and organized and that the An’ object of the ‘present invention is to provide invention is not limited to the precise arrange a simple, inexpensive and durable rotameter ments and organizations of the instrumentalities which can be installed in conventional pipe lines as herein shown and described. or the like, Another object of the present inven In the accompanying drawings in ‘which like tion is to provide a rotameter, the frame of which 15 reference characters indicate like parts through is made up of two identical and interchangeable out: — parts. Still another object of the present inven tion is to provide a rotameter in which the ‘,‘heads” for connection to the ends of the meter ing chamber are adapted to be held in spaced relationship to each other without the use of spacing bolts or columns. A further object of the present invention is to provide a rotameter, Figure 1 represents a perspective View of one embodiment of‘the present invention as it ap pears when disassembled. Figure 2 represents a vertical cross-sectional view of the embodiment shown in Figure 1 in as sembled position. ‘ - Figure 3 represents an end elevational view of the frame or housingnof which consists of two identical and interchangeable castings which can 25 the embodiment of Figure 2. Figure 4 represents a plan view of the embodi quickly and easily be assembled and dis-assembled ment of Figure 2. by means of simple bolts or the like. Another Figure 5 represents a view partly in vertical object of the present invention is to provide a cross-section and partly in perspective of the rotameter in which thelmetering tube is held between the “heads” of the frame solely by end 30 metering tube shown inFigur-es 1 and 2. Figure 6 represents a horizontal cross-sectional wise compression and in which ?uid-tight seals view generally along the line 6-6 of Figure 2. _ are provided between the ends of the metering Figure 7 represents a horizontal cross-sectional tube and the heads solely by end-wise gasketing. view generally along the line l—‘! of Figure 2. ’ A further object of the present-invention is to provide a rotameter in which the sealing pressure 85 Figure 8‘represents a horizontal cross-sectional view generally along the line 8—8 of Figure 2. required for maintaining ?uid-tight seals between Figure 9 represents a view. similar to that of the ends of the metering tube and the “heads” is Figure 5 but showing a modi?ed form of metering supplied by the fastening meansemployed to con tube in which the angle-cut ?utes are given a nect the parts of the rotameter frame to each other. Another object of the present invention 40 downwardly-diminishing radial depth and in which the outside of the tube is made conical. is to provide a rotameter having inlet and outlet Figure 10. represents a horizontal cross openings in the upright portions-of the frame. A sectional view along the line l0—l 0 of Figurev9. further object of the present invention is to pro 'Figure 1.1 represents a horizontal cross vide a rotameter in which the frame is provided 45 sectional view generally along the line ll-—l| of with conduits leading from the upper and lower Figure 9. v ' “head” portions thereof through the upright por-. Figure 12' represents a horizontal cross tions and terminating in generally horizontally sectional view generally along the line |2—|2 of extending inlet and outlet openings disposed gen erally intermediate the ends of the vertical meter Figure 13 represents a view similar to that [of ing tube. Still another object of ‘the present in Figure 5 but showing a further modi?ed forni‘oi" vention is to provide a rotameter which can be ’ ?uted meteringv tube in which the ‘ v?utes are installed directly into a horizontal pipe line. rounded instead of being angler-cut as in the em Other objects and advantages of the present ln-_ bodiments of Figures 5 and 9. . 1 vention are 1 apparent in the following speci Figure 14 represents a horizontal cross-g Figure 9. ‘ . ' ' 2,404,361 3 A similar pair of bolts can be inserted through the openings 45‘of the upper inverted housing element 39—b and can be fastened within the screw-threaded sockets 43 of the lower element 39——a. When the two pairs of bolts 46 are tight ened,’ the end wall 42 of each of the housing ele ‘ sectional view generally along the line 54-44 of I Figure .13. ‘ Figure 15 represents a horizontal cross-sectional ‘ view generally along the line |5—-|5 of Figure 13. Figure 16 represents a cross-sectional view simi lar to that of Figure 14 but showing a tube hav in cross-section. ' ‘ ‘ face “of the other or the'housing elements 30 to provide the assembled generally rectangular ' Figure 17 represents a view similar to ‘that of Figure 5 but showing an un?uted metering tubal}? ‘ having a conical or tapered inner bore. ‘ I ments 69 is held firmly against the seating sur 1 ing tapered ?utes which are generally elliptical 1 _ 4 Figure 18 represents a cross-sectional view gene . ' rotameter frame or housing. 7 ‘A relatively short thick-walled rotameter tube ’ is'adapted to be held in an upright position be~ of tween the housing elements 39. One form ' . erally along the line metering tube which'may be used with the rotam; Figure 19 represents a horizontal‘cross-sectional' " 'eter of my present invention, is the tube 3|, 1 Viewgenerally along the line | 9-149 of Figure 17." shown in Figures 1, 2 and 5 which is thesubject Figure 20 representsa perspective view of a of my‘copending application '7 Serial No. 484,711, ‘ stop pin alternative to that ‘shown in Figures 1 ?led April 27, 1943, Patent No. 2,377,861, granted ‘ and2. ’ v Figure 2d represents'a perspective view of an- 4 other modi?ed form of stop pin. ‘ In the embodiment shown'in Figures 1 1308, I may provide a rotameter having a frame or housing formed of ‘two symmetrical interchange able elements which are designated generally by the'Treference character 36. The housing elements 39 are generally L'-shaped as shown particularly in Figure 1 and are adapted‘to be. 'detachably connected to each other to form the generally rectangular rotameter'fra'me or housing._ ‘When the elements 3B are so connected, the'lower vone ~ constitutes the inlet housing element which is‘ designated more particularly as 39—-a while the upper one constitutes the outlet housing element which is designated more particularly as til-‘b. The housing elements 39 are adapted to‘ sup port,»and to provide communicating conduits to, the ends of ‘a'transpa'rent vertically disposed me tering tube 3| having a metering ?oat 32 ‘adapted for free up-and-down movement therein." ‘ '7 ' ' Each. of the housing elementstil is ‘provided with a centrally-disposed opening t3‘extending June 12, 1945. 7 ‘ vThe metering tube 3| which is adapted to be held in upright position between the housing ele ments 39 is a relatively short, thick-walled trans » parent tube which is usually of glass (but which maybe of transparentsynthetic plastic or other suitable material). ' ‘ The metering tube 3| has a cylindrical outer surface 41 and is provided with a generally cy lindrical inner bore 48 within which the cy lindrical metering ?oat 32 (or any other conven tional type of metering ?oat) ?ts with a relatively close annular clearance as shown,‘ for example, in Figure'Z. ' ’ A plurality (as ' ' for example 4) of flutes 49‘ are circumferentially disposed around the ‘inner ' bore v4S and extend generally axially of the tube 3|‘. Each of the?utes 49 'isformed byradially extending plane side walls 59 and a circumfer entially extending curved back wall '5 l. The back walls 5| ‘are formed as’ segments of a cylindrical ' surface whose‘ center of curvature lies at the axisv of the tube so that the ?utes 49 have the" same radial depth throughout theiraxial length. from the inner face 34 of the bases-550i the L and forming a “head”v portionfof the .rotamet‘er frame or housing. A screw-threaded opening 39 The‘side'walls 5i] converge downwardly so that the‘ ?utes “49 have a ‘relatively large circumfer ential dimensionat the top of the tube- 3|; (at which point the cylindrical inner bore 48 of the extends in alignment with, and in continuation of, the opening 33 to the outer face 310i the'base tube ‘3| is reduced to four small portions inter- ‘ mediate the ?utes as shown in Figure 6‘) and so 35.‘ The opening 36 is adapted removably to re ceive a screw-threadedplug 38. 'f " that the ?utes terminate at the point of inter A conduit 39 extends within the housing’ ele-‘ 50 section of the sidewalls 59, somewhat abovethe ment' '30 from the central opening 33 thereof lower end of the meterin‘g'tube 3 I. Slightly above through the upright portion or'arm 49' of the-L the "lower ends of the ?utes 49, the inside of thev and vterminates in an outwardly-extending screw tube 3| would have vthe appearance shown in threaded opening, 4| in the upright portion 49. Figure '7 in which-the,‘ cylindrical bore 48 occu The‘end wall 42 of ‘the arm 40is'provided with 55 pies'most of‘th'eperiphery with the ?utes 49 oo a pair ‘of ‘inwardly-éextending ‘screw-threaded cupying only‘ very small portions of the periph ery.'~The lowermost portion 52" of the tube 3| V sockets 43 whose function willbehereinaf-terdef scribed; - a - > 1. . > The‘ end of the base 35 is provided with ‘a smooth slightly raised inwardly-extending seatingsurface 44; a pair of drilledopenings 45 extending through the base 35 from the ‘outer face 31 thereof to the a 60 (below the lower ends of the ?utes 49) has ‘a wholly cylindrical inner ‘bore as shown in Fig ure 8. a The - Y tube’ 3| : is ' ' '4 adapted to be positioned intermediate the lower housing element ‘39-11 and the inverted upper housing element 39-—b' The openings '45 and the sockets 43 are sym with the inner bore ofthe' tube communicating metrically disposed on either side of-the central 65 with’ the .central'0penings-33 in the. housing ele- ' transverse plane of the housing member'sothat ments.~ » , a pair of headed screw-threaded bolts 4ttcan be L'A' generally circular gasket-seat 53 is formed inserted through the openings '45~of thevhous upon-the inner face 34 of, the base 35 of the ing element 39-41, as indicated in Figure .1, and housing element surrounding the , opening 33» fastened within ‘the sockets-43- of the inverted 70 therein. vA pair ofisimilar aperturedv compres- ~ elem'ent-Sil-b; the outer-ends-of the openings siblef sealing 'gasketsjii, are disposed upon the 45 being preferably enlarged to permit the. bolts gasket-seats 53 and ‘are’ adaptedvto provide-a 46 to be counter-sunk and ‘to be. generally ?ush ?uid-tight seal intermediate the ends of the me with the outer face 31 oitheabase 351when‘fully 75 tering tube3| and vthe housing elements 39-11 seating surface'44yr 1 screwed in. > - ‘ - ' 2,404,361 5 6 and 30——b when end-wise pressure is exerted, upon the housing elements. 7 The dimensions of the several parts of ,the ro tameter of the present invention are so propore tioned that, when the bolts 46 draw the end walls 42 and the Seating surfaces 44 into contact with each other, end-wise pressure is exerted upon the gaskets 54 which is sufficient to provide a ?uid tight seal between the ends, of the tube 3| and the housing elements but which is not great 10 enough to cause breaking or straining oi the rela tively frangible metering tube. I . r The housing elements 30 are provided with re than the pressure above‘ the ?oat) whereupon the ?oat is moved upward within the tube. But as the ?oat is moved upward, a greater by-pass' area is available to the ?uid (due to the fact that. the ?utes become greater in cross-sectional areav near the top of the tube) and the pressure un balance is reduced so that the pressure-drop across the ?oat again becomes relatively constant and the ?oat remains relatively still at a higher position within the tube. , ' . In this way, the height of the ?oat within the tube is a direct indication of the rate-of-?ow of the ?uid. The rotameter can be calibrated forv movable stop pins 55 which extend through gen erally horizontal apertures 56 acrossthe central 15 ' the particular ?uid being metered so that the height of the ?oat against the calibrations etched‘ openings 33 of the housing elementsyremovable or otherwise applied to the outside of the tube 3| screw-threaded plugs 51 permitting side-Wise in Will be a direct reading of the rate-of-?ow of, the sertion and removal of the pins. When the ro ?uid. Or, instead, the calibrations applied to the tameter is assembled, the pins 55 extend horizon outside of the tube can be an arbitrary scale, the tally just above and below the ends of the meter_ ingtube 3| and serve to limit the up-and-down 20 reading of which will givetherate-of-?ow of any one of several ?uids by reference to suitable cali movement-of the metering ?oat 32. In this way, bration and conversion tables. ' the metering ?oat 32 is kept within the con?nes Due to the fact that the ?utes 49,,do not. ex of the metering tube 3| and is prevented from tend to the bottom of the tube 3| so‘that the rising or falling into the apertures 33 of the hous 25 ?oat, at rest, is in the cylindrical lowermost ing elements 30. portion 52 of the tube 3|, in which it has very In place of the separate pin 55 and plug 51, I slight clearance, even the slightest ?ow of ?uid will be su?icient to raise the ?oat 32 appreciably within the tube 3|, so that the rotameter of the tegral. Another form of stop pin is shown in Figure 21 30, present invention is sensitive to very small ?ow_ rates. On the other hand, the rotameter of the in which a screw-threaded plug 53 adapted to be present invention has an unusually wide. range: inserted within the opening 36 is provided with due to the fact that the by-pass areapresented by an inwardly extending stop pin portion 60 which may employ a stop pin 58, shown in Figure 20, in which the pin and threaded head are made in limits the movement of the ?oat. . the ?utes increases relatively rapidly asthe ?oat 35 moves upward within the tube so that even at The rotameter of the present invention is relatively large ?ow-rates the ?oat does not rise adapted to be quickly and easily connected with beyond the upper end of the metering tube 3| in either horizontal or vertical pipe lines. Where it is desired to measure the rate-ofe?ow Thus, for example, where it isrdesired to meas ure the'rate-of-?ow of a ?uid moving in, a hori 40 of a'?uid moving in a horizontal pipe-line from right to left in Figure 2, the rotameter is simply zontal pipe-line from left to right in Figure 2, rotated around the imaginary axis of the meter_, the plugs 38 are inserted within thev vertically ing tube horizontally so that the side inlet open extending screw-threaded openings 36 of the ing 4| of the lower metering element 30-a ex housing elements 3||~—a and 30—b and the pipe tends toward the rightto receive the oncoming line is connected to the screw-threaded side open ' ?uid from the pipe-line and so that the side out-,, ings 4| of the housing elements 30; the side open ing of the lower element 3|l-a forming the inlet let opening 4| of the inverted housing element 30—b extends toward the left of the rotameter; and the side opening of the upper inverted ele the functioning of the rotameter being the same ment 30-h forming the outlet of the rotameter. The ?uid entering from the pipe-line at the inlet 50 as described hereinabove. Whereit is desired to measure the rate-of; opening of the element 30-.0. passes through the ?ow of a ?uid moving upwardly within a vertical conduit 39 and the central opening 33 of the pipe-line, the plugs 38 are removed from the housing element 30—a and passes upwardly into vertically-extending screw-threaded openings 36, the cylindrical inner bore 48 of the metering tube 3| The upward pressure of. the moving ?uid 55 and are inserted within the side openings 4| of the housing elements :30; the pipe-line being _con-_ lifts the metering ?oat 32 upward within the tube ' nected into the openings 36 aslshown; in dotted. beyond the lower ends of the ?utes 49 whereupon lines in Figure 2. Whenthe rotameter is so cone the ?uid enters the ?utes, by-passing the ?oat, nected, the upwardly moving ?uid will pass and passes upwardly through the tube 3| beyond the ?oat 32 into the central opening 33 and the 60 through the opening 33 of the lower housing element 3||—a and into ‘the metering tube 3| , conduit 39 of the upper inverted housing element to by-pass the ?oat 32 through the ?utes 49, 30—-b ?nally to leave the rotameter through the ?nally to leavethe opening 33 of ‘the upper hous side outlet opening of the element 30-!) and to continue its ?ow in the pipe-line. ‘ , ing element 30-?) th ough the opening 36 thereof. ' j I ' The height of the ?oat 32 within‘ the metering 65 Therotameter of the present invention can also tube 3| is a measure of therate-of-?ow of the be "so installed as to change the direction of ?ow ?uid, the greater-the rate-ofe?ow, the greater of ?uid in a pipe line. Thus, ’ for example, it is" the height of the ?oat within the tube. That is, possible to change from horizontal to vertical ?ow‘ when the ?oat is standing still at some point in by connecting the, horizontal pipe-line to the termediate the ends of the tube, the pressure drop , side inlet opening 4| 'of the housing element 3||—a across the ?oat of the rotameter is constant and and by connecting the vertical pipe-line to the is equal to the negative buoyancy of the ?oat in outlet opening 36 of the housing element 30—b; the ?uid. Upon any increase in the rate-of the opening 36in the housing element 30-—a' ?ow, a momentary unbalance of pressure occurs and the opening 4| in the housing element (the pressure beneath the ?oat becoming greater 75 30-h being closed by the plugs 38. Similarly, 2,404,361 shown in Figures 9 to 12 and 13 to 15 of the it is possible to change from vertical to horizontal flow by connecting the vertical pipe-line to the Thus, for example, I may employ the fluted ‘inlet opening 36 in the housing element -30—a tube 6! shown in Figures 9 to 12. The tube 6| land by connecting the horizontal pipe-line to the has a cylindrical inner ‘bore 62 generally similar ‘outlet opening 4! in the housing element 30—b; Cu to the‘ inner bore 48 of the tube 3!. However, ‘ the opening M in the housing element 30--a drawings. ' The housing elements30 can be readily and ‘ inexpensively formed as single castings in which 10' the necessary openings and conduits can be formed .by drilling or other conventional opera l ‘ circumferentially disposed about the cylindrical inner bore 62 of said tube 6| and extend gen Since the housing elements are identical and 66 which is formed as a segment of a conical fully interchangeable, it is necessary to manu 15 wall surface having its axis of curvature at the axis facture and to stock only a single type of hous of the tube and being downwardly tapered at an ing element, which with the metering tube, gas angle more or less approximately parallel to the kets and necessary bolts and plugs can easily be angle of taper of the outer vconical surface 63.’ assembled and installed by any pipe-?tter or Thus, the ?utes 64 vary not only in circum 20 mechanic of average ability. ferential dimension (as is the case with the ?utes Rotameters, as heretofore used, have been rel 49 ofthe tube 3|) but also in radial depth; the atively expensive and “made to order” in that ?utes being large in circumferential and radial each rotameter has been ordered according to the dimension near their tops as shown in Figure 10 particular requirements of the proposed instaL and being small in both radial and circumferen lation. Rotameters, being precision instruments, 25 tial dimension near their bottoms as shown in_ have heretofore been installed only by specially Figure 11. The ?utes 64 terminate somewhat , trained and skilled men and such installation has above the lower end of the tube 6! so that an required specialized and relatively expensive ?t tings, etc. unfluted cylindrical inner surface 61 is presented Thus, for example, a rotameter, as at the lowermost portion of the tube 6| _ heretofore used, may consist of the metering tube, 3 separate inlet and out1et.“heads”~or ?ttings, a plurality of supporting and spacing bolts or col stu?ing boxes for enclosing 1 umns for the heads, 7 Still another form of metering tube is the tube 68 shown in Figures 13 to 16,. The tube 68 has a cylindrical inner bore 69 and a cylindrical outer surface 16. A plurality (as for example 4) of ?utes ‘H are circumferentially disposed about the the ends of the tube including packing and stu?- . ing glands, bolts, etc. Where the ?uid to be 35 inner bore 69 and extend generally axially. of metered was passing through a horizontal pipe the tube 68. VEach of the ?utes 1! (instead of line, rotameters as heretofore known required being angle-cut as are ‘the ?utes of the meter ing tubes 31 and 61) is smoothly curved and is special piping arrangements since their inlet and outlet openings were at different levels.’ As the result of these and other factors, ro tameters, as heretofore known, have been sold formed. as a segment of a concavely conical sur face having a downward taper. In this embodi ment, the ?utes ‘ll extend the entire axial dimen sion of the metering tube 68; the ?utes being only at prices which are too high to permit their use in many places where the inexpensive de large and deep near the top of the tube as shown in Figure 14 and being smalland shallow near the bottom of the tube as shown in Figure 15. termination of the ?ow-rate of a fluid is desir'; able. 7 ' ‘I g ' _ The rotameter of ‘my present invention, on the The rounded tapered ?utes, instead of having the circularcross-section shown in Figures l3, ' 1 other hand, employing as it does a single type of ‘ interchangeable housing element and eliminating the expensive stu?ing-box, and greatly reducing l4‘ and 15, may be given any other smoothly curved cross-sectional ‘con?guration, as for ex the number of parts, as'well as simplifying the installation thereof,’ can be sold and installed at a fraction of the cost of conventional rotameters.l ample the elliptical cross-section shown in Fig lire 16. ' l8 and 19 which has a conical, downwardly ta pered inner bore 13 and a cylindrical outer sur ablein a large and varied ?eld of industrial and} termination of ?uid ?ow-rate. ' inexpensive de face 14. V V > While so-called “one-piece” rotameters, are known, the expression “one-piece’? is misdescrip tive of these oconventional rotameters, since the ' The metering tubes 3 I, 6 I, 66 and 1'2 have been described hereinabove only by Way of example 60 and it is to be understood that the novel rotam latter, in reality, are composed vof an integralv ‘metal frame (having upper'and lower heads and, connecting columns), upper and lower separate metallic stu?ing glands, upper and lower sepa rate metallic gland followers and three or four packing rings in each stu?ng box; that‘is, ?ve metal parts (leaving aside connecting bolts and nuts andgthe like) and six or eight sealing ele ments.~ The rotameter'of the present invention, on the other hand, has only two metal parts and‘ two sealinglelements (the gaskets‘ at the ends of the metering tube). ' ‘ ' ploy the metering tube 12 shown in Figures 17, indicator are thus, for the ?rst time, made avail ‘ . home‘use inconnection with the ' Instead of a ?uted metering tube, 1 may em The advantages of the rotameters as a ?ow-rate ~ ' erally axially of said tube. Each of the ?utes 64 is formed by a pair of plane radially-extending downwardly converging side walls 65 and a back 1 tions. . 1 ' the outer surface 63 of the tube 6| is made conical with a relatively slight downward taper. A plurality (as for example 4) of ?utes 64 are , and the opening 36 in the housing element 36---b ‘ being closed by the plugs 38. ' i 1 7 Figures In place 1, 2 ofandthe 5, Imetering may employ tube-other 31 shown types of.‘ ?uted metering tubes such as, for example, those‘ - eter of my present invention may employ any metering tube which presents substantial end walls so as to permit end-wise gasketing between the tubev and the housing elements. 7 The metering tubes employed with‘ the rotam eter of the present invention may be calibrat ed (by etching or otherwise) upon the outer'suré face, as shown in Figure 1 or upon the inner, cylindrical bore, as shown in Figure 9 or both as ' shown in Figure 13; the dual calibration shown in Figure 13 being e?’ective to prevent refractive error which might otherwise result from the thick wall of the metering tube if the ?oat were viewed at an angleyother thanthe horizontal. '. , ' ' The present invention‘ may be embodied in 52,404,361 jother’spe'ciiic, forms?without departing from the "spirit or‘lessential attributes thereof, and vitgis ‘therefore desired that the present’embodiments be considered in all respects as illustrative and not restrictive, reference being had to the append- . ed claims rather than to the foregoing descrip tion vto indicate the scope ‘of the invention‘. Having thus described my invention, what I claimgas, new and desire, to protect by Letters Patent is: ' 1. A rotameter comprising a vertical metering tube having a metering ?oat adapted for free up-and-down movement therein, a pair of iden 6, A rotameter comprisinga continuous frame formed by a pair ‘of identical and interchange able generally L-shaped juxtaposed elements 'de- 'tachably secured to each other, a vertical meter ing tube having a metering ?oat therein and be ing supported intermediate said elements with the opposite ends of the tube in ?uid-tight seal ing relationship to , connecting passageways formed in said elements, said passageways lead ing to aligned oppositely extending horizontal outlets and also to aligned oppositely extending vertical outlets, said horizontal outlets and said vertical outlets being adapted for alternative con nection to a pipe-line. ments constituting the end ?ttings as well as the 15 7. A rotameter comprising a continuous frame frame for the metering tube, and means, for de formed by a pair of identical and interchange tical and interchangeable generally L-shaped ele tachably securing said elements directly to each other in operative relation to the ends of the me tering tube, said frame having aligned horizontal able generally L-shaped juxtaposed elements, fastening‘ means detachably connecting said juxtaposed elements and pulling said elements openings therein whereby said rotameter can be 20 vertically together, a vertical metering tube dis connected directly within a horizontal pipe-line. posed intermediate said elements and supported 2. A rotameter comprising a vertical metering at its ends thereby, a‘pair of compressible an tube having a metering ?oat adapted for free up nular sealing members disposed intermediate the and-down movement therein, a pair of identical ends of the tube and the adjacent portions of said ‘ and interchangeable generally L-shaped elements elements, said sealing members being compressed constituting the end ?ttings as Well as the frame upon fastening of said fastening means to pro for the metering tube, each of said elements hav vide a ?uid-tight seal intermediate said elements ing a conduit leading from an opening on the inner side thereof adapted for connection to one end of the metering tube and leading to an open- ; ing on the outer side thereof for connection to a ., pipe-line, and means for detachably securing said elements directly to each other and for simul taneously supporting said metering tube inter and the ends of said tube, said elements having conduits formed therein leading from the ends of said tube and terminating in aligned oppositely extending horizontal outlets adapted for detach able connection in a pipe-line. 8. A rotameter comprising a frame formed of a pair of generally L-shaped housing elements of metal having conduits formed therein, means detachably connecting said housing elements, a relatively thick-walled metering tube having a 3. A rotameter comprising a vertical meter~ freely-movable metering ?oat therein and being ing tube having a metering ?oat adapted for free vertically disposed intermediate said housing ele up-and-down movement therein, a pair of identi_ 40 ments, said frame having aligned horizontal cal and interchangeable generally L-shaped jux openings communicating with said metering tube taposed elements detachably secured directly to through said conduits, and a pair of plane an eachother to form the frame for the metering nular sealing members disposed intermediate said tube and constituting the end ?ttings thereof, housing elements and the end Walls of said meter said elements having aligned horizontal openings ing tube, said sealing members being axially com and conduits formed therein, said metering tube pressed upon fastening of said connecting means being supported intermediate said elements with to provide a ?uid-tight end-wise seal interme the ends of the tube in ?uid-tight sealing rela diate said metering tube and the conduits formed tionship to said \conduits, said conduits forming in said housing elements. a continuous passageway from said metering tube 9. A rotameter adapted for connection directly 50 to said aligned openings. mediate said elements with the ends of the tube disposed in ?uid-tight relationship to the inner openings of said elements. 4. A rotameter comprising a continuous frame formed by a pair of identical and interchange into a horizontal pipe-line comprising a continu ous frame formed by a pair of generally L-shaped housing elements of metal having conduits formed therein, said elements being detachably tachably secured to each other, a vertical meter ing tube having a metering ?oat therein and be 55 held in abutting relationship by connecting means, said housing elements having aligned op ing supported intermediate said elements with positely extending horizontal openings commu; the opposite ends of the tube in ?uid-tight seal nicating with said conduits and adapted for con ing relationship to, connecting passageways nection to the pipe-line or the like, and a meter formed in said elements, said passagewaystermi nating in aligned horizontal outlets adapted for 60 ing tube having a freely-movable metering ?oat therein and being vertically held intermediate connection to a pipe-line, and a horizontal pin said housing elements in ?uid-tight sealing re removably disposed within each of said elements, lationship with said conduits. said pins providing top and bottom stops for said metering ?oat. 10. A rotameter comprising a continuous frame 5. A rotameter comprising a continuous frame 65 formed by a pair of identical and interchange able generally L-shaped elements having con formed by a pair of identical and interchange able generally L-shaped juxtaposed elements de~ ‘ duits therein, means detachably connecting said elements in abutting relationship with each tachably secured to each other, a vertical meter~ ing tube having a metering ?oat therein and be other, a metering tube having a metering ?oat ing supported intermediate said elements with therein and being vertically disposed intermedi the opposite ends of the tube in ?uid-tight seal ate said frame elements, and a pair of annular ing relationship to connecting passageways compressible sealing members intermediate said formed in said elements, said passageways termi frame elements and the ends of said ‘metering nating in aligned oppositely extending horizontal tube, said annular sealing'members being axially outlets adapted for connection to a pipe-line. compressed upon fastening of said connecting able generally L-shaped juxtaposed elements de 2,404,361 11 means, to provide a ?uid-tight seal between said metering tube and said conduits. ‘ ~ ‘ 11. Arotameter comprising a continuous frame 7 ‘formed by'a pair of identical and interchange able generally L-shaped castings havingconduits therein, means detachably connecting said cast-4 ings in abutting relationship with each- other, a metering tube having a metering ?oat therein and being vertically disposed intermediate said frame castings, said frame having aligned 'hori- 10 '12 zontal openings therein communicating with said ‘ metering tube through said conduits, and a- pair ‘ of annularscompressible sealing members inter mediate said frame ‘castings and the ends of said metering tube, said annular sealing members be ing axially compressed upon fastening of said connecting means, to provide a ?uid-tight seal between said metering tube and said conduits. V NATHANIEL BREWER.