US1139221A - Stop-valve. - Google Patents

Description

w. G. POTTER.

'STQP VALVE. APPLICATION FILED !AN.19, 19H.

- Patented 1 11, 1915.

ZSHE -'HEETI.

H I I7 w; e.' POTTER.

STOP VALVE.

APPLICATIOR FH .ED JAN. 19,. 1 914.

2 SHEETS-SHEET 2.

Patented-May 11, 1915.

WILLI AM G. POTTER, OF MARBLEHEAD, MASSACHUSETTS.

STOP-VALVE.

Specification of Letters Patent.

Application filed January 19, 1914: Serial No. 818,056.

To all whom it may concern Be it known that I, WILLIAM G. Power,

a citizen of the United States, residing at Marblehead, in the county of Essex and Stateof Massachusetts, have invented new and useful Improvements in Stop-Valves, of which the following is a specification.

This invention relates to an improved stop valve, the same being particularly adapted to be used in connection with a series of boilers, all connected to the same main steam pipe in a manner known as a battery of boilers.

The stop valve of this invention is inter posed between each boiler and the main steam pipe and is so constructed and con.- nected to the said main steam pipe and its respective boiler that if, for any reason, the pressure in theboiler to which the stop valve is attached should substantially change, for instance, if a tube blows out or if the foreman allows the pressure in the boiler to decrease substantially, or if for any reason the pressure in the main steam pipe decreases, then said step valvewill automatically act to close the pipe leading from the boiler to the main steam pipe.

It is the object of this invention, therefore, to provide a stop valve which will, antomatically operate to close the passage in the connections from the main steam pipe to theboilor when the pressure in the boiler -or in said main steam pipe decreases and which will automatically operate to open said passage when the pressures in the main steam pipe and the boiler have again bei come substantially equal.

it is also the object of this invention to provide a stop valve of the character set forth and means to lock the valve in a predetermined position.

The invention )l'lSlSlZS in the combination and arrangement of parts set forth in the following specification .and particularly pointed out in the claims, thereof.

'lici'errmg to the drawings: Figure 1 is a sectional elevation taken on line 1-1 of Fig. 3. Fig. 2 is a sectional plan taken on line 22 of Fig. 1. Fig. 3 is a sectional plan taken on line 3+3 (if Fig. 1. Fig. 4 is a sectional elevation taken on .line 4-4 of Fig. 3. Fig. 5 is a diagrammatic 'plan of a battery, othoilers and a main steam pipe onnected thereto with 'iny improved stop valves interposed between said batteries and said main steam pipe.

Like numerals refer to like parts throughout the several views of the drawings.

In the drawings, 6 is the valve casing which is provided with an inlet passage 7 and an outlet'passage 8. A member 9 is mounted to rotate within said casing and within a cylindrical sleeve 10 formin a seat for said member 9. The rotary mom or 9 is provided with ports 11 and the sleeve 10 is provided with ports 12. A- chamber 13 surrounds the sleeve 10 and opens into the outlet passage 8. The rotary sleeve 9 is open atboth ends and opens at its lower end into the inlet passage 7, so that when the ports 11 register with the ports 12 the passage 7 communicates with the passage 8 and when the ports 11 are out of register with the ports 12 the passages Tend 8 are out of connection with each other and the valve is closed.

The casing 6 is preferably made in two parts, a lower part 14 containing the rotary member 9 and an upper part 15 which is fasgage notches 9' in the upper end of the rotary sleeve member 9. The stem 23 is arranged to rotate in a bearing 24 provided in the upper part vl5 of the valve casing. It will be seen that by removing the upper part 15, the stationary sleeve 10 and the rotary sleeve -9 may be removed and replaced by similar new parts or repaired as the case may be.

The piston 17 is arranged to reciprocate in a fluid pressure cylinder 25, such as steam under pressure. One end 26 of said cylinder is connected to a source of fluid pressure, such as the boiler 27 by pipes 28 and 29. The opposite end 30 of the cylinder 25 is connected to an indelp'endent source of fluid pressure, such as the main steam pipe 31, by pipes .32and 33.

Patented May 11, 1915.

, cylinderz..42 is connected by a pi e 44 to the pi e 29 and thus to the boiler 2 while the The upper part of the casing 6 has a fluid pressure chamber 34 therein which opens into the fiuidpressure cylinder through a passage 35. The upper end of the stem 23 projects into said fluid pressure chamber 34. This fluid pressure chamber is connected to the pipe 28 by pipes 36 and 37,

there "being acheckwalve 38 interposed between said pipes 36 and 37. Said chamber 34 is, also connected to the pipe 32 by pipes 39 and 40, there being also a check'valve 41 interposed between said pipes 39 and 40 (see Fig. 4). Thus a check valve-is interposed between each of the sources of fluid pressure, viz, the boiler 27 and the main steam pipte 3 1, an'dthechamher 34.

wo fluid pressure cylinders 42 and 43ers contained within the upper part 15 of the casing 6 and communicate with the fluid pressure chamber 34 in said casing. The

cy 'nder 43 isconnected by a pipe 45 to the pipe 33 and thus to the main steam pipe 31. A piston 46 is containedwithin the cylinder 42 and is adapted to reciprocate therein, the

movenientof said. piston in'one direction in said cyiinder'b'eing limited by an annular shoulder 47 constituting a stop. A spring 48 inclosed within the c linder 42 bears against the pistpn 46 an normally holds 1 said piston against the stop.- shoulder 47. The piston is provided with a piston rod 49',- the free end' of which bears against a flat face'SO Em the segmental gear 22. Said piston and rod are prevented from rotating by a guidepin 51 which projects into a slot 52 formed in the piston rod 49. The pin 51 is fast in the partition 53 which is part of the casin 6. Another piston 54 is provided in the cylinder'43 and its movement in one direction is limited bya stop shoulder 55 onthe casing 6. Said iston is normally held against said shoul er by a spring 56 inclosed within the cylinder 43, and bearing against the piston 54. The piston 54 is provided with a piston rod 57 which bears at its free end against a flat face 58 on the segmental gear 22. Said piston 54 and its rod 57 are prevented from rotating by the pin- 51 which projects into a slot 59in the piston rod 57.

It will be noted that the free ends of the pistons 49 and 57 bear against the faces 50 and: 58 on the segmental gear 22 and that said rods bear against said segmental: gear onopposite sides of a median axial plane of said segmental gear, thus forming a lock to prevent the segmental gear 22 from rotating and thus locking the rotary membet. 9 of the stop valve against rotation, except under certain conditions hereinafter specifically set forth.

The. pipe 28 is connected to the pipe 32 by a pipe 60 in whichis provided a valve nialnste'ampipe. The pipe 28 has a blowofi' pipe64Eattached thereto in which is pr'o--' vided ashut-ofi' valve 65.

A fluid pressurewhistle 66 is connected-to the cylinderj25 by a pipe 67, the same en-w .terin'g saidifcylinder; as illustrated in Fig.-

3, at a point lwhere it"will be shut off from cornmunicatidgiXwithisaid: cylinder by the piston head 19, ivhen the piston 17 is in the central positibdhnd the valve 9: is'open'. When the piston i7 moves in either direction, as hereinafter described, the pipe 67 I will have communication with the end 26 of said cylinder or with the pressure chan1 ber 34, as the case may be,and thus pressure will be brought to bear upon the whistle 66 and an alarm givento indicate that for some reason the valve 9-is closed.

The generalloperatiom of the mechanismv Thepipe 33l13$ valve 63 therein which is, interposed betwben the pipe 32 I and the hereinbefore specifically described is as follows: Assumingthe pressure in the main I steam pipe 31 and in the boiler 27 to be substantially the same, then; the 1 parts of the stop valve will be in the positions illustrated in the drawings Figs. 1 test inclusive, and

curs the steam pressure from the main pipe 31, through the pipes 33 and 32, will act upon the piston head 18 tomove the piston 17 in the direction of the arrow 0; (Fig. 3). The rack 21 will then cause the segmental gear 22 to be rotated in the direction of the arrow 1) (Fig. 3), thus rotating the stem 23 and sleeve 9 to move theports 11 out of register with the ports 12 and. thus close thepassage 7 from the passage 8, shutting ofl the steam from this particular boiler to the 1 main steam pipe 31. During this operation the pressure in the chamber 34 remains the same as that in the end 30 of the cylinder 25,

' being connected to the same pipe 32 by the pipes 39 and 40, and the. check valve 41 being under these conditions open. The check valve 38 will at the same' time be closed, by

reason of the reduction of pressure in the pipe, 28 and the malntamlng of the same pressure in the chamber 34 and pipe The piston 54 will remain seated against the shoulder 55 by reason of the pressure in the chamber 34 and in the cylinder-'43 being the same, but the pressure in the cylinder 42 having decreased, by reason of'its vconnection through the pipe 44 with the pipe'28 and the boiler, will allow the piston 46 to be moved away from the shoulder 47 by the inseam pressure of the steam in the chamber 34. Thus the segmental will be unlocked and 'free "to rotate as the pressure of the piston rod 49 upon the face 50 of said segmental gear will be removed.

When the piston 1? is moved to a suiticlent extent so that the piston head 19 moves will be operated by the pressure of the steam from the chamber 3e through the passage into the cylinder 25' between the piston heads 18 and 19 and thus outwardly through the pipe 67 and through said alarm device 66. Thus an alarm will be given notifying the engineer that the pressure in the boiler 27 has been substantially reduced for some I cause. As soon as the cause of trouble in the boiler has been remedied and the pressure in the pipes 29 and 28 again becomes equal to that in the main pipe 31 and in the pipes 32 and 33 connecting therewith the pressure of the steam will become equal on opposite sides of the'piston 46 and on the opposite ends of the piston 17. The piston 46 will be moved toward the shoulder l? by the spring 48 andthe free end of the piston rod 49 pressing againstthe fiat face 50 of the segmental gear 22 which at that time will be in an inclined position relatively to the end of said piston rod, will cause the segmental gear 22 to be rotated in the opposite direction to that of the arrow 'b and the piston 1'? will be moved in the opposite direction to that ol. the arrow 11 and thus the valve'will be opened, said I segmental gear coming to a stop when the face 58 abuts against the end of the piston rod59, and the piston 46 simultaneously abuts against the shoulder ll, The parts are then in the relative positions illustramd in Fig. 3, the valve is opened and locked by the piston rods 49 and 57 and their re spective pistons 46 and 54.

Assuming, now, that the pressure in the boiler 27 remains constant, but that the pressure in the main steam pipe 31 is decreased for any 1 reason, then the pressure in the end 30 of the cylinder 25 will de crease, the piston 17 will move in the opposite direction to the arrovv a, the check valve 41 \vill be closed, the check valve 38 will be opened there will be a decrease of pres sure in the cylinder 43 and the piston 17 moving in the opposite direction to that of the arrow a Will cause the segment gear 22 to be rotated in the oppositedirection to that of the arrow I). Said segment gear will be unlocked soas to allow the same to be rotated to close the stop valve, by reason of the fact that the pressure in the chamber 34 will. cause the piston 54 to move awav from the shoulder 55, thus removing the end of the piston rod 5? fromlho fiat face 58. As soon asthe pressure in the main steam pipe becomes equal to that in the boiler 27 the check valve l1 will be opened, the pressure in the chambers 34 and in the end 30 of the cylinder 25 will be eoual, the pressure in the cylinder l3 will be equal to the pressure in the chamber 34 and thus the" piston 54: will be moved toward the shoulder 55 and through its piston rod 57,

'Which bearsat this time against the inclined fiat face 58 of the segmental gear 22, will cause said segmental gear 22 to be retated in the direction of the arrow 6 while the piston 17 moves in the direction of the I arrow a and thus the rotary me' her 9 will be moved until the ports 11 are in alinement with the ports 12 and the valve 9 is then opened and locked in itsv central position by the two pistoh rods 49 and 57 located on opposite sides of a median axial plane passing through the axis of the stem 23 and between the cylinders 42 and 43. The blow ofi 64 ahd valve 65 are provided so that the engineer can test the Working of the device daily or whenever desired.

By opening the valve 65 the pressure in the pipe 28 will be decreased and the mechanism Will'then operate, if in proper condi tion, to close the stop valve, When the valve 65 is closed the pressure in the pipe 28 will return to its normal pressure and the'parts'will return to the position illus- "trated in Fig. 3, the valve being then open.

Under normal conditions thevalve 62 in the pipe 60 is closed and the valve 63 in the pipe 33 is open. If, however, for any reason it is desired to shut ofi the main steam pipe from the stop-valve mechanism, the valve 63 is closed and the valve 6:2 opened, so that an equilibrium of pressure upon opposite ends of the'piston 17 is maintained as-wellas an equilibrium of pressure between the cylinders 42 and 43 and the chamber 34.

Ordinarily it is not desirable to haye'the boiler shut ofi' from the main steam pipe by the stop valve, unless there is a substantial difierence between the pressure in' the boiler and in the main steam pipe. Therefore, t hc springs 48 and 56 are'made so as to require about five pounds pressure to what I claim and desire by Letters Patent to secure is; p p

1. A stop valve embodying a casing having an inlet'and an outlet passage and a rotary member in said casing adapted to al 6O "respectively, said casiifghavingsa fluid pres opposite directions including areciproca? ternately open and close said 'passages when I rotated in either direction, inechanisin adapted to rotate said rotary member in reciprocatory piston pressure cylinder in rhiehsaid pistonis adapted to reciprocate, independent sources of fluid pressure connected to'said cylinder at opposite ends of said piston, respectively, and

fluid pressure operated means adapted to lock said piston in a predetermined position.

5. A stop valve embodying a casin -havd a rotary member in said casing' ad'apted' to alternately open and. close said passages when rotated in, either direction; mechanism adapted, to rotate said rotarymcmbcr in 013-, positedirections, including a 'recipl'ocatory member with piston heads at the ends there of, respectively, a fluid pressurecy-linder in which said piston heads are adapted to res ciprocate, and independent sources of fluid I at.

pressure connected to said cylinder atop-- posite -endsmofsaid reciprocatoryj member,

sure chamber opening into'said ifiiijf press sure cylinder between said pistonliea s- ,and cqnnected to both of said independent sources of fiuid'pressuie enema-m n saidpressure and said fluid pressure chamber.

sneerr tcang .iiae said fluid p 1 harsher and a 'checkvalve interpofid hetvkeen each of saidfsources "of fluid tory piston and a fiiiid pressure cylinder'in- 6. Astop valve embodying a casing hay-, ,v

which said piston is adapted to reciprocate, --mg an inlet and an outlet passage an a roindependent sources of fluid pressure contary member in said casing adapted tofalternected to said cylinder at opposite ends of fnately-open'and close said assags, mechasaid cylinder, respectively, and fluid pres- 7 them adapted top rotate sa "rotary member;

sure operated means adapted to iock said in opposrtediiections mclndmg a reciprocap piston in a predetermincdposition. V ,ry ifmemhei w th piston heads at the ends 2. A stop va ilve embodyingfa casing-hav=""'t reef, respect vely, a fimdfpressnre cylin' ing aninlet and an outlet passage and a ro. 'derin which said piston heads are ada ted tary member in said 'casingadapted to-alterto reciprocate, independentsol rces of uid nately open and close said passages when row-pressure connected to said cylinder at op- 30 tated in eitherdirectioinmechanism adaptposits-ends -of sa1d rec1procatory member, I cd'to rotate said rotary member in. opposite respectively said casingiiaving a flu d presdirectio'ns, including a reciprocatory piston" sure chamber opening into fll idpresand a fluid pressure cylinder in which said surecyhnder between said piston heads and piston is adapted to rcciprocate,' and" i'nde' connected to 'bo th of said 1nd pe e s5v pendent sources of fluid pressure connected sources of fluidpressure, a check valve nto sai cylinder at opposite ends of said pis terposed between each of said so lCQS of item, respectively, 7 1 flmd'pressure-andsmd fluid pressure chamf A stop valve embodying a casin havber, two fluid pressure cylinders communimg an inlet and an outletgpassage an a 1'0- CEL-iJIDg WI'Ch said'flmd press'nrechambcr and 0 tax-y member in said'cesing adapted to aleachconnected to gne'of said sources oj fluid tern'ate'ly open and close sai assages when pressure, a pisten in each of said last-named rotated in either direction a gear .fast to cylinders and means controlled bys'aid last said rotary m1enibei',a{ istonwitha vrack namedp nsadaptcd to 1001; 831d rotary thereon meshing into sai gem cylinder in, inember in a predetermined pos1t1on H which said piston isadap ted-to .i-eci irecitte 7 7- A Stop qvalve embodying a casing havand independent/sourcesof fiuid pressure mg ananlet and an outlet passageandaro connected Jo 85m. cylinder ,atfipposite ends tary membj in 's'urd a'slnmadapted 'to a ter of said piston, respectivel'gs z/ 7 i r natcl y open and close sai assages, mecha-' 4;A-stop valve embodying a casin havnism adapted to r otate sa1 r otary member 10 ing an inlet and an outlet passage an a roin opposite d1 r ec t1ons,-mclnd1n'g a reciprotary member in said casing adapted to alcatory member tvith pistonheads at the ends ternatcly open and close said passages, thereof, .1'espect yely, a fluid ressurevcylmj mechanism adapted'to rotate said rotary der in which'said piston'hea s are adapted v member in opposite directions including ato reciprocate, independent sources of fluid-106 pressure connected to, said cylinder at oppo- SitGWffidtl -Of saidaeciprocatory member, re- Spectively, saitLcasing ha-ving a fluidipres' sure chamber opening intossaid'flii-idipres i sure cylinoerbctwecn said pistonehcads and connected ,to both of said independent sources of fluid pressures check valve mi l terposcd .jbet veezr eaolr of said sources T fluid pressure ifiliilg id fifild pressure chamher," two fluid pressiireicyl'inders cdfmniin' "eating with said fluid ressurechamber "efiich connected to one of said sources of'flrr pressure, a piston in each of said la st naiiied cylinders, and a spring in each of said lastnamed cylinders adapted to force the respective piston toward. saidefiuid pressure chamber and means-controlled by said :last named pistons tOlGCiI said rotary member in apredet'ei mined "'ositiomy s. Astopyal embodyingdtcasingHiving an inlet n e tlet passage and s rotar-y member in said c sing adapted tolalter lia t'eiympen and closeisaid pa'ssages; mechafnism"adaptd toarotate seie m embe in,oppositepdirections,inclndin iii:

eatery member with'piston heads at the ends thereof, respectively, a fluidpressure ,cylin der in which said piston'heads areada" ted -to reciprocate, independent sources of uid pressure connected'to said cylinder at opposite ends of said reciprocatory member, re-

spectively said casing having a fluid pres-V sure chamberopening into said fluidpressure cylinder between said piston heads and connected to both of said independent sources of fluid pressure, a cheelg alleiinterlfli posed between, each of said sburces of fluid pressure and j said fluid pressure chamber,

' two fluid pressure cylinders communicating with said fluid pressure chamber and eaeh connected to one of said sources of fluid pressure, a piston in each of said last-named cylinders, a stop adapted to limit the movement of each of said pistons, in one direction, and means controlled bysaid lastmmed pistons adapted to lock-said rotarymember in a predeterminedposition.

9. A. stop valve embodying-a casing having an inlet and an-outlet passage and a rotary member in said casing adapted to alternately open and elo'sesaid passages, a segmental gear fast to said rotary member, a

reciprocatory member; with piston heads at the ends thereofyrespeetively, a fluid pressure cylinder in which said pistonheads are adapted to reciprocate, independent sources of fluid pressure connected to said cylinder at opposite ends of said reciprocatory member, respectively, two fluid pressure cylinders tary member in said casing adapted to alterv nately open and close said passages, mechanism adapted to rotate said rotary member 7 in opposite directions, including a reciprov eatory'piston and a fluid pressure cylinder in which said piston is adapted to reciprocate, independent sources of fiuidpressure connected to said cylinder at opposite ends of said piston, respectively, means to disconnect one offsaid sources of fluid pressure from said cylinder and means to connect the other of said sources of fluid pressure to said i cylinder at the end thereof thus disconnected from its normal source of fluid pressure,

' l l A stop .valve embodying a casing having 'aii'inlet and an outlet passage and a Y rotary member in said casing adapted to alternately open'and close said passages,- mechanism adapted to rotate said rotary member in opposite, directions, including a recipro-i catory member with piston heads at the ends thereof, respectively,.a fluid pressure cylin der in which said piston heads are ada ted to reciprocate, independent sources 0 fluid pressure connected to said cylinder at OPPQ? site ends of said reciprocatory-member, respectively, said casing having a fluid pres-- sure chamber opening into said fluid pres sure cylinder between said piston heads and connected to both of said independent sources of fluid pressure, two fluid pressure cylinders parallel to each other and at right angles to said first named fluid pressure cylinder, said pair of fluid pressure cylinders communicating with said fluid pressure chamber and each of said last-named fluid pressure cylinders connected to one of said sources of fluid pressure, a piston in each-of said last-named cylinders, the inner ends of the heads of said piston all being subject to the same fluid pressure in said fluid pressure chamber, a spring in each of said last-' named cylihders adapted to force the respective piston toward said fluid pressure I chamber and means controlled by said lastnamed pistons to lock said rotary member in a predetermined position.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses. f, g I v a a WILLIAM G. POTTER; Witnesses V V.

CHARLES S. Goonmo, SYDNEY E. TAFT.

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