US900506A

US900506A - Blow-off valve.

Info

Publication number: US900506A
Application number: US37875907A
Authority: US
Inventors: John S Forbes
Original assignee: Individual
Current assignee: Individual
Priority date: 1907-06-13
Filing date: 1907-06-13
Publication date: 1908-10-06
Anticipated expiration: 1925-10-06

Description

' J. S. FORBES.

y BLow-orr VALVE. APPLIOATIoN FILED JUNB13, 1907.

Patented Oct. 6, 1908.

4 SHEETS-SHEET 1.

'InvG/via nd.. e

. J. s. FORBES. BLOW-OFPV VALVE.

APPLICATION FILED JUNE 13, 1907.

Patented o@t.6,1'9os. v

4 SHEETS-SHEET 3.

*"J. s. FORBES;

Y BLOW-OPF VALVE.

APPLICATION FILED JUNE 13, 1907. 900,506.

J. S. FORBES. BLOW-OFI VALVE.A APPLIUATIONTILBD mula. 1901.

Patented Oct. 6, 19""- 4 SHEETS-SHEET 4.

lIl//llllll ria z @gpg UNITED STAT-Es PATENT onirica.

JOIIN s, FORBES, or PHILADELPHIA, PENNSYLVANIA.

BLOW-OFF vALvE.

Specification of Letters Patent.

Patented Oct. 6, 1908.

Application filed June 1s, 1907.' serial No. 378,759.

ture, shall; have its partsso arranged that` even under the most severe operating conditions said parts shall satisfactorily perform their various functions with a minimum of attention and repairs.

It is; further desiredY to provide a fluid controlling device especially adapted for use as a boiler blow olll valve, in which the parts subjected to Wear under operating condi-V tions shall in no Way affectV the tightness or serviceability of the device; there being also provided means Wherebythe part serving as the lmovable element of the valve causes a body or bodies of packing to be so yacted on as to prevent leakage through the valve after said part has been brought to its closed position. j y

Another Object of the invention is to provide a valve of the blow off type, which in its preferred form. shall loe balanced and therefore easily manipulated and which shall have its movable element completely protected from the injurious action of any solid bodies passing through the valve when said element is iniits open position. l

A further object of the invention is to provide a valve in`` which is overcome the objections inherent in all valves where the closure is eifectedvby means Iof a diskorv gate yheld againsta seat wherein the surfaces forming the seat or joint are liable to become scratched or scored by grit or scale passing over them or by so-called wire drawing f when'the valve is cracked or only slightly open. This object isaccomplished by the use of'packing arranged to form a joint between the interior surface-of the valve-casing or body and a sliding cylindrical shell, and by providing Ineans whereby said 'packing' is always protected from the current. of fluid with its possible charge of solid material passing through the valve.

These objects and other advantageous ends I secure as hereinafter set forth, reference being had to the accompanyingdrawings, in which :-e 4

Figure 1, is a vertical section of oneform of my improved valve, illustrating it in its closed position; Fig. 2, is a section similar to Fig. l, ilhlstrating the valve in its open position; Fig. 3, is a vertical section taken on the line 3 3, Fig. 1, further illustrating the detail construction `of the valve shown in Figs. 1 and 2; Figs. 4,' 5 and 6, are perspective views illustrating certain detail elements of the valve shown in Figs. 1 to 3; Figs. 7 to 11 inclusive, are vertical sections illustrating various modifications of my invention; Figs. 12 and 13,' are perspective views illustrating the detail construction of" certain of the parts found in that form of my invention illustrated in Fig. 10, and Fig. 14, is a vertical sectionon an enlarged scale illustrating in detail the construction and arrangement of the packingrings and their associated parts as found in Fig. 7*.

In Figs. 1 to (S of the above drawings, A. represents the main ,structure or casing of the valve andthis provided with an inlet av and an outlet ld'1; the casing being constructed with a cylindrical bore in line withv said outlet. The end of said bore-opposite the outlet is provided with a cover B secured to the casing in any desired manner', in the present instance by bolts Z). Passing through the cover is the valve stein C having an operating wheel or handle c and provided with a threaded portion c.- Between the upper end of said threaded `portion and the handle, the spindle passes through a stuling box in the cover provided with a gland b and in addition said cover is eounterbored, illust-rated at b2, to receive a collar c2 formed on the spindle C. The bore of the casing A is lined with two cylindrical sleeves D and D whose interior diameter in the .present instance sul'istantially the same as the internal diameter of the outlet a', though it isto Abe noted that the lower extremityof said outlet is Vprovided with a shoulder .formed by an inwardly extending Aliangc L2 ifor a purpose hereafter noted.

Between the lower edge of the sleeve IX vand the adjacent edge of the recess formed in the casing A for its reception,-is an annular body of packing d and it will be noted that this encireles the bore of the casing below the inlet (L. Confined between the upper edge of the sleeve D and the lower edge of the -sleeve D, so as to encircle the bore'of the casing above the level of the inlet a, is a sec ond body of packing d', and the said slewi- D is provided with an openingin line with shown in Figs. l and 2.

lThe cover B of the valve casing has aportion b3 projecting fora limited distance into the bore of said casing and between this'part and the upper ledge of the lining sleeve l.) I confine the disk-shaped head c ofa structure E, shown in detail in lfig. 6. Said structure includes la second and smaller disk e, connected to the head e by a portion c2, curved to form partV of a cylindrical surface. The Avalve stem C passes through ,an opening e3 in the part e of the structure E, while its end cs is centered and properly supported by a bearing formed in the part e of said structure.y ln order to prevent revolution/of 'the structure E, I providein the present instance two pins b4, which project from the part 7)" of the cover B `through'openings e* in the disk e; these pins being, moreover, of such a length that they extend beyond the lower iaee of said disk.` The valve proper or, movable member lof my device consists of a cylindrical shell F of the construction illustrated in detail in Fig. 4. This is of such an external diameter as to tit within thelsleeves D 4 with the inlet a and also with the opening in the side of the sleeve D. At the upper end of this movable member or shell F lprovide .a lug threaded for the reception of the threaded `part c of the valve spindle and having laterally'extendingwings or lugs f2 whose upper ends are so placed as to engage the-ends ot" the pins b4 when said shell is moved to its uppermost position.

From Figs. l to 3 inclusive, it4 will be seen that the parts e ande of thestructure E are desirned to tit within the movable shell j i*` and for this purpose l so form the latter' as to permit of theintroduction of the part e into its interior just below the threaded lug f. The radius otcurvature of the part c2 and of the outeigedge of the disk portion.

e of the'strncture E is such that when the variousA parts are assembled, as shown. in Figs. l to 15, there is left between the .said curved part e2 and the interior of the sleeves l) and D a 'space 'ust sufficient to receive and ermit'fre'e movement of the shell member j rl'he disk part e of the structure ll is so placed relatively to the disk e that its member as to permit the passage of lluid above or into the. upper part of the valve structure within the sleeve l). lf, n ow, it be desired to close the valve, the handle e is turned in aright handed direction, with the result that the movable number or shell l? is moved longitudinally upward within the casing', thereby gradually cutting oli' the fiow ot liuid through the inlet d and the opening in the sleeve D until the opening in said movable member has been drawn entirely above the top of the inlet.

It. will be seen thatthere is little or no opposition to the movement ot the shell I",

'since bothoif its ends are equally exposed to the pressure ot' `the liquid or fluid in the structure. The continued upward movementof said shell linally causes its wings to strike the pins o, which, as before noted,

, project beyond t-he'under surface oi" the disk c, and a result of the consequent downward pressure of the collar e2 on the valve sternupon this disk c, the latter is caused to press downwardly upon the upper edge oi. the sleeve D. By the time that this downward pressure occurs, it will be understood that the flow through the inlet has been completely blocked or .shut oli1 by the lower cylindrical'portion of the shell F, so that said pressure is transmitted through the packing fl to the sleeve D and thence to the packing cl. These two rings or bodies 'of packing are therefore compressed and caused to form fluid tight joints between the wall ot' the casing proper and the exterior wall of lthe shell or movable member F, so that any possible leakage of Huid above or below said rings Vis absolutely prevented. l't is obvious that the said rings may be compressed to any desired degree simply by turning the handle c of the valve stem C. l

In again opening the valve, the moving of the handle c in a left handed direction at once releases the pressure of the pins e* on the wings 7' and hence releases the pressure of the collar o2 on the disk c and on the upper edge ot the shell l). he packin rings /Z and 1l are, therefore, loosened so t )at the movable memboror shell l"`|nay be freely lowered in the casing without undue friction or wear on said packing.

With the device dtisoribed it is to be noted that there is absolutely no possibility ol wear or injury to those portions ol: the movable nui j ceases member which are depended upon to prevent How of water through the structure, for when in use these parts are completely covered within the lower part of the casing and are 'at no time exposed to the action of fluid passing through the valve or to damage from solid particles carried thereby.

In theevent Yof any solid body becoming caught in the inlet so as to project through the opening f of the movable member F, it will be seen that the edge of said opening will act, when the valve is closing, as a shear blade to cut such a body, inasmuch as it passes between the two relatively sharp edgesv formed by the upper part 'of the opening;- through the sleeve D and the lower face of. the disk portion e ofLthestructure E. Moreover, it is obvious that the various parts of. the valve may be removed with the greatest ease for purposes of` inspection .for the replacing of the packing rin-gs d vand d, though under conditions of use neither of these operations is apt to be required except at-long intervals because of the protection afforded to vboth packing, sleeves, shell-,and casing by` virtue of their construction and arrangement'. lt will further be`noted that when the valve is closed there is no possibility of sediment or other solid `material so 4accumulating as to `ii-rteiifere with the immediate opening of' *the valve, for from Fig. l, it will be seen that under these conditionsvv the opening through the Vshell or movable member F is completely inclosed between the curved. part e2 of the structure E and the interior surface of the shell D.` Moreover, there are no recesses or Ebellows to become filled with sediment, since the inlet is4 closed f by the curved lower portion of the shell F.

In Fig. 7, have illustrated a form of my invention in which the bodies of packing d and -el are tightened by means of bolts d 'extending through the cover B of the valve casing into engagement with the adjacent edge of 'the sleeve D. iln this case the movable'inember or shell 'has the form indicated at 14" and in order to lclose rthe valve it is moved toward the out'let a thereof. lWith' such a construction l provide a cylindrical sleeve E having at'. one end a flange c and mount *this so that its interior forms a con tinuation oi. the outlet a of the valve casing'.

' The *flange a is engaged by a sleeve D2 and the 'intern-al diameter o'f'the parts is such that an annular space is left between the lsleeves i" and D? for the reception of the end of the cylindrical` shell F. In this instance, the packing dis confined between the -sleeves D and D', while, as before, the packing d is con-fined between the sleeves D and D. VV'hen, ltherefore, the valve is in its closed position, the space f is fully protected from an accumulation of solid material, while when the valve is open` the opening;l in the shell is in liijxie with the inlet a. 'Fluid passing through the valve, therefore, flows from said inlet through the opening` of the sleeve D and into the sleeve E, from whence it passes to the outlet.

In the form of my valve illustrated in Fig.

'7, l have shown a construction of sleeves,

shell and easing which may be employed in any form of my invention, and this invol ves casting-the casing A- so that certain limited portions only of its interior require finishing'. In vother words, while the exterior surface of the sleeve D, D and DL is accurately nished, the inside surface of the casing A is accurately finished only at those points. where it is adjacentn to packing d and al. The intermediate portions of the interior of the casing, such as vthoseindicated at o4 and (L5, are rough and unfinished; being formed offa large-r diameter, so Ithat there is a space left between them and"the adjacent portions of the surface of the sleeves D, D and D2. Similarly, these sleeves themselves are formed so as to have the greater portion of their interior surface of a larger diameter than the enter# nal diameter of the cylindrical shell F so as to engage 'the saine at their end portions d4, d, etc. As a consequence, while the packing' acts against finished surfaces, the relatively extensive areas otherwise requiringfinishing may be left in a ooi'n-parati'vely rough condition, thereby materially red-uc- -ing the oost of the valve, as well as diminish- 'ing the amount of surface frictionally eril gagiiigv'the Icylindrical shell. i

n Fig. 8, I have illustrated a form of my valve in which the cylindrical shell F is unbalanced, and is used with but a single body of packing (Z placed around it between the inlet a and the outlet a. In this case, 1 provide arsingle long sleeve D3 extending between a disk@8 placed immediately adj aeent to the cover iB, and a body of packing d;

this sleeve being provided with an opening to permit flow of fluid into its interior from the inlet a., i In Fig. '9, the sleeve E2 has a flange mountedin a manner similar tothe sleeve E shown in Fig. 7, vbut extending upwardly within the cylindrical shell l!" and Vhaving` iis lip-per end closed; there being similarly an opening in the side, as indicated at e, placed so to be in line with the inlet a of the easing.Y There are two bodies of packing confined between lthe sleeves D, D and D2', and the cylindrical shell operates in a space between these latter sleevesI and the sleeve E2. ln this instance also said shell is moved toward -the outlet in order to close the valve. -The valve stem C has its end guided in the end section of the sleeve E2 and, as before described, engages a threaded lug in the upper portion of the shell.

which the valve stem. while threaded as be fore, `passes through a threaded portion. 0f the ,cover B, sothat in opening the valve, s'aid stem will move longitudinally. Other- Wise, as is noted, this forni of valve is similar tothat .illustrated in Fig. 7, except that iit is provided with but a single body ot packing` (l placed between its inlet and outlet. ln Fig. 1.1, l have illustrated my invention as applied to a through valve -or one having its outlet placed 180 distant from its inlet, instead ot' at'y right angles thereto as in the other valve illustrated. In this ease, the sleeve E is provided with a straight passage through its upper end in line with the inlet and outlet a and a. Said sleeve tits Within the cylindrical shell F, which is connected to the valve stem C whereby it may be moved longitudinally. v

Linin i the valve casing A2 are two sleeves D4 and D2 the latter of which bears upon the flange e of the sleeve e3 and has its upper end cut ott so that its end lies in a plane of about 30 to its axis. Similarly, the sleeve D4 has its upper end cut away so as to lie in a plane at a similar angle to its aXis,'while the upper. portion of the sleeve D, as well as the lower portion of the sleeve D4, have openings respectively Coming in line with the inlet' and outlet of the valve casing. A body of packing d is confined between the adjacent edges of these two'sleeves D and D and will be seen to extend in the form of a ring around the sleeve It", and, as before, between the inlet and outlet of the casing. By virtue of the position ot' said ring, it extendsaround the cylindrical passage through the valve and also around the cylindrical shell which intersects said passage, so that though beingv but a single ring, it very etfectnally prevents the leakage around said shell.

AIn order to tighten up the packing rings in such cases as have been illustrated in Figs. 5%, 9, 10 and 11, Yl -torni on the' shell 1" a pair of'projccting lugs f7 and provide on the inside ot' the sleeve D or D, as the rase' may be, vertically extendinggrooves (/-lt' foithe reception ot said lugs. As a result', not onlyl is the shell 1" prevented vtroni turning.

but after it has been moved to'its closed po-y sition, the lugs f7 strike the bottoms ot' the .ti'oovcsrlm and thereafter an)y further revo-- lution of the valve stem causes said shell li" to force downwardly the sleeve 1), willi the result that the packing rings are forced out ontightened as before.

lt is obvious that the upward movement. oi'ithel shell l ",wl iich occ'urs in opening the.

and having an opening capable of being brought opposite the side opening thereof,

means for moving the shell, and a structure side opening, subst antiallyias described.

2. rl`he combination with a as-ing having a cylindrical bore provided with side and end openings, a disk-shaped strut'lture mounted in the casing and to one side oi' the side opening thereof. a shell longitudinally movable in the casing and tilting outside o't said disk structure, with means ior moving said shell to open or close the valve, substantially as described.

3. The combination in a valve, ot' a casing having inlet and outlet openings, a shell in the using, means for moving the shell so as to close the valve. packing surrounding the shell to prevent leakage between the Vinlet andthe outlet'. means for moving the shell, and a device tor tightening the packing said devicebeing placed to be actuated by the continued operation ot' the shell moving means after the shell has been moved to its closed position. substantially as described.

l. The combination in a valve, ot a casing having inlet and outlet openings, a shell lon gitudinallv movable in the casing` bodies of packing surrounding the shell on both sides ot' the said opening..and -means vloi moving the shell to close the valve, willi a` device aetuatcd bv said means tor tighteningthe packing` substantially as described.

Fi. 'l`he combination in a valve, of a casing having an inlet and an outletA opening, a sleeve in the casing. a body of packing oonlined between one end ot' said sleeve and the easing and placed between the inlet and the outlet opening thereof, a shell in the easing, meansfor moving the shell to close the valve, and meansl for causing said shell moving mcansito exert pressure on the sleeve to cause the packing to prevent leakage around the shell. substantially as described.

t. 'lhe combination in a valve, of a` casin having an inlet aiul an outlet opening, a she movable in the casing to eut oli1 the tlow of tluid through the valve, sleeves in the easing outs-ide ot the shell, a body of packin)r between `said sleeves. and a second hotly of packing between one oi' the sleevcsund the casing. with means ifor moving the shell, sai-d means being operative on the sleeves to tighten tht` packing at'ter the valve is closed substantially as described.

i. The combination in a valve` ot a casl ing having an inlet and an outlet opening, a.

tl ti device actuated by said means for pressing upon one of said sleeves to force the two bodies of packing into intimate engagement with their adjacent f structures to prevent leakage, `substantially as described.

The combination in a valve, of a casing having an inlet and an outlet, a eover for` one end of the casing, a. val ve stcni passing through the cover and having a threaded portion, a longitudinally movable shell in the easing having a lthreaded lug engaging the threaded part ol' the valve stem, there beine' an o ieninO in the en'd ot said shell and another opening in the side tlereof so placed that the valve is closed when the shell is iuoved toward the cover, i .a antiallj.' as described.

.4 a t). l ne combination in a valve, of a cas' ing having un inletand an outlet opening, a hell movable within theI easing to open and close the valve, packing surrouiuling the shell between the inlet aiul the outlet, aA rotatable valve stem having a limited longitudinal movement and operatively `connected to thel shell for operating the saine, and

means acted on b y the valve stein for tight stein, a pin or pins on the cover placed to eng-'age the shell structure when the valve is elosed,1uiek1ng for preventing leakage past the shell between the two openings, and a `sleeve acted on by said collar after the pins have engaged the shell structure to compress said parking` and prevent leakage, substantially as described.

11. The coinbiiiation in a valve, ot a easing having inlet and outlet openings, ot which one is formed in its sidc,.a valve stein supported at one end of the casing, a shell operatively connected to the valve stem and movable thereby within the casing to cut olf the liow oi fluid between the inlet and outlet opeiiings, a disk-likc structure fitting within the said shell on that side of' the side opening distant. from the otheropening ol the casing, and a supporting ,structure tor said disk structure forming with the interior ol the easing a recess for the reception of the shell, .substantially as described. l

l2. The combination in a valve, of a casing having an inlet and an outlet, a cylindrical shell movable within thcca"sin'g, two disk-like structures having a section of a slet-,ve connecting them and mounted in one end of the casing, a cover forsaid end of the casing, a valve rod operatively engaging the .shell and guided by said disk-like structures.

the sleeve forming With the interior of the casing ay recess for the reception of the shell, Substantially 'as described.

13. The combination in a valve, of a casing having an inlet and an outlet, a cover for the casing provided with a projecting pin or pins, lining sleeves within the casing, a body of packing between the adjacent ends of said sleeves, and a second body of packing between one of the sleeves 'and the casing, a disk like ystructure confined between the cover and one of the sleeves and having olieiiings for the passage of the pin or pins, a. shell movable within the sleeves provided with an opening placed to be brought in line vith one of the openings of the casing, a valve stem passing through the cover al'id the disk-like structure and provided with a threaded portion in engagement with a correspondingly threaded part ot' the shell, there being a collar on said stem` engaging the disk-like structure, and a projecting iving or wings on the shell placed to engage the pin or pins of the cover under predetermined conditions, substantially as described.

l-t. 'llie combination in a valve, of a casing having an inlet and an outlet opening, a sleeve in the casing, means for preventing turning of the sleeve, a body of packing engaged by one end of the sleeve, a movable shell within said sleeve, means foiylongitudiiially moving the shell, and a device ac tiiated from said means through .said shell for exerting pressure on the sleeve to compress the packing when the valve is in its closed position, substantially as described.

15. 'lhe combination in a valve, of a casing yhaving an opening in itsside, and another in its end, a cylindrical shell within the casing, means including a rod for moving the shell to.bring a portion ot' its snriaee opposite the side opening ot the casing to close the same, with means within the shell constructed to serve as a guide for the end ol the shell operating rod t'or preventing passa-ge otl solid material into that part thereot" distant from the end ol'iening ot' the easing, substantially as described.

ilt. rl`he con'ibination ina valve, of a casing haviiigan opening in its side and another in its end, a cylindrical shell within vthe casing, means for moving the shell to bring a portion ot itssurface opposite the side 'opening ot' the casing to close the same, with a disk mounted in the .shell on' that side of said opening of rthe casing distant from the end opcningthereot, substantially as de#l scribed. i

17. Thecombination iii a valve, of a casing having anV inlet and an outlet, a cylindrical shell within the casing, a valve rod l'or moving the shell to open ror close the valve, and a structure placed within but independent of the shell to receive the inner end of the valve rod and confine material to voutlet of the Casing,

that part of said shell between the inlet and lsubstantially as described. f

18. The combination in a valve, of a. eas ing having an inlet and an outlet, a lining sleeve or sleeves for the casing, a cylindrical shell operative in said sleeve or sleeves for controlling the passage of Huid from the inlet le the outlet, end means for moving the shell, the interior surface of seid lining sleeve or sleeves having both finished sind unfinished portions, of which the former are ei? limited extent and are placed to be enguged by the shell, While the unfinished portions ure distant from the shell und provide empty spaces separate from the passage for the How of fluid, substantially as described.

l5). The combination in a valve, of a easing h :tving :in inlet and an outlet, :L longilejopgsoe JOHN S. FORBES.

signed my in the presence of iVitnesses WVM. E. Snirrn, Jos. H. KLEIN.