US1665391A - Safety valve - Google Patents

Description

April 1o, 192s.

1,665,391 i V. WILLOU GHBY SAFETY VALVE Filed May 22, 1925 2 Sheets-Sheet l 'TTONEY 2 Sheets-Sheet v Y za E l vo N0 0 w@ n M a f 6 M #i y a 620i mw awo E r WMF Mw 3 my V. E www 6 a, W a, #www M M,

V. WILLOUGHBY SAFETY VALVE Filed May 22, 1925 April l0, 1928.

' 2 scoe of of the claims will occur to persons 60 which is provided w1 Patented Apr. 1o, 192s.

UNITED. STATES VICTOB-WIILOUGHBY, F BIDGEWOOD, NEW JERSEY, ASSIGNOR T-O 'AMERICAN' GAB AND FOUNDRY COMI PANY,'0F NEW YORK,

sanary alipucmon mea lay aa,

This invention relates to safetyvalves for car tanks and it is an object of this 1nvention to provide an improved safety valve having .a seal which maintains a as ti ht 5 closure prior to the operation of t e va ve and which'is sheared or ruptured by the operation of the valve. It is also an object of this invention to provide a safety valve of the type described of such construction that l a broken seal may be replaced without dismantlin the valve or necessitating the opening of t e valve or the removal ofthe valve from the tank.

The accompanying drawings illustrate the 15 preferred form of the invention, though it 1s to be understood that the invention is not limited to the exact details of construction shown and described, as it is obvious that various modifications thereof within the ed inthe art. In said drawings: Fig. 1 is a vertical section of a safety valve constructed in accordance with this invention 25 and s hown applied to a car tank dome;'

Fig. 2 is a top` plan view of the safetyu valve shown in ig. 1' art of the seal retaining rings being bro en away to showother parts more clearly; A

Fig. `3 is a vertical section drawn to a larger scale taken on the line 3-3 of Fig. 2;

Figs. 4, 5 and 6 are views similar to Flg. 3 showing modified constructions of the seal retaining rin s, valve and valve casing;

Fig. 7 is a ottom lan view of the retaing ring of Fig. 6 w ich secures the seal to the valve casing, and Y c Fig. 8 is a broken transverse section of the ring shown in Fig. 7.

Inhe drawings the safety valve forming the subject matter of this invention is shown. applied to a car tank dome 1 having a dome* head 2 in which is-the usual openin 3 to receive the safety valve surrounded y the 45 ring 4 secured to the dome head 2 by rivets (not shown) engaging the Bange 5 -of the ring 4 and the dome head 2. The'rlng 4 is interiorly threaded to receive .a valve casing 6 having an inwardly projecting( Bange 8 an inclined valve seat 10 to receive the valve 12 and with a surface 14 which serves asa shoulder against which bears one end of the valve spring 16. The other end of spring 16 bears against a -ed by the plug 26 threaded in the annular- 'ly from, the outer edge of the surface 28, and

lvided at its outer edge with'a downwardly surface 60 above and offset 'slightly from the N. Y., A CORPORATION 0E NEWJEBSEY. vALvn. I

itat. semina. sacos.

spider 18 carried by the stem 20 which 'is' pivotally mounted in an opening 22 in the valve 12. The spider 18 is secured in adjusted position on the `stem 20 by the nuts 24. Leakage through the opening 22 is preventflange 27 surrounding the opening 22.

T e valve 12 is provided with a surface 28 inclined to seat on the valve seat 10 and with a surface 30 inclined upwardly and inwardthe Bange 8 is provided with a horizontal surface 32 extending outwardly from the upper edgev of the surface 10. Secured to the valve 12 by bolts 34 is a ring 36 havin a downwardly projecting/Bange 38 provided 70 with an outer surface 37 corresponding in inclination to the surface 30. The ring 36 is also (provided with a Bange 40 projecting outwar ly beyond/the Bange 38 and pro- 75 projecting Ban e 42, the Ban es 40 and 42 forming with t e Bange 38 a s allow` oove 44. Secured to the valve casing 6 y the bolts 46 is a ringA 48 having. a Bange 50 provided with a bottom surface 52 adapted to bear upon the surface 32 of the valve casing, the Bange projecting upwardly and lying beneath the shallow groove 44. Between the surfaces 30 and 37 and between the surfaces y32 and 52 is a frangible seal 85 54 securely held in position when the bolts 34 and-.46 are tightened, as the ro'ections of the Banges 38 and 50 are suc t at therings 36 and 48 do not bear against the valve l12 and valve casing 6, respectively, 90

at any points other than these surfaces. As shown in Figs. 1 and 3, the surfaces 30,

37, 32 and 52 are provided with shallow grooves 56.

In the modification shown in Fig.l 4 the valve-12 is provided with an inclined surface 28 which seats against the valve seat 10 on the Bange 8 of the valve casing 6. The valve 12 is provided with a lhorizontal surface 28 and the Bange 8 is' provided with a horizontal surface 62 offset from the valve seat`10. To the valve 12 the bolts 34 secure` a ring 36 provided with a downwardly projecting Bange 38 having a horizontal surface 64' which cooperates with thegsurface 60 of the valve and .with an outwardly projecting Bange 40 having a downwardly proJecting 46 secure a ring-48 havin a flange 50 with a horizontal bottom sur ace 52 which cooperates wtih theusurface 62'of the valve cas-.

ing flange 8. The flange projects upwardly beneath the shallow groove 44 as in the construction shown in- Fig. 3. In this construction as in the contsruction shown in Fig. 3, the surfaces 60, 64, 52 and 62 are provided with shallow grooves 56. Secured between the cooperating surfaces and 64 and 52 and 62 is av frangible seal 54 held in position when the bolts 34 and 46 are tightened as the. rings 36 and'48 in this oo nstruction, as in constructionshown in Fig. 3, do not bear against the valve 12 or valve casing the seal in position.

In the modified construction shown in Fig. 5', the valve 12 is provided with the lnclined surface 28 to yengage the valve seat 1 0 o n .the flange 8 of the valve1 casing 6 as 1n prevlous construction. The svalve 12 is also provided'with a horizontal surface 60 and has secured thereto by bolts 34 a ring 36 havin a downwardly projecting flange 38 provi ed with an outer surface 64 as in Fig. 4. The'ring 36-is also provided withthe out-v wardly projecting' yflange- 40 havmg the downwardly projecting flange 42 forming with the flange 38 the shallow groove 44 as in the revious constructions. The valve casing ange 8 is provided with an inclined `-surface 70 offset from the surface 10 and extending at an angle thereto and the flange 8 has secured thereto b the bolts 46 a. ring 48 which has an incline surface 72 which co. operates with the surface 70. The ring 48 is also providedrwith the iange 50 which projects upwardly beneath the shallow groove 44. Secured between the surfaces 60, 64, and 72 is a frangible seal 54 which is held in position when the bolts 34 and .46 are 4tightened as the rings 3 6 and 48 do not contract with the valve 12 and valve casing 6, respectively, anywhere except where in engagement -with the seal 54.

In the Inodied construction shown in Fig. 6, the valve 12 is provided with the inclined surface 28)which engages the valve seat 10 upon theflange 8 of the valve casing 6 and the valve 121s provided -with a. horizontal 'surface l80 extending at a-n an le from the outervedge of the' surface 28. o the valve 12 bolts 34 secure the ring 36 havin a downwardly rojectin flange 38 which as 4an outer surfiice 82 w 'ch' cooperates with the surface on the valve. To the flange so` 38^ is secured the outwardly projecting flange 40 having the downwardly projectin ange' 42 which forms with the flange 38 t e shallow groove 44. The valve casing flange 8.

is ,provided with a horizontal up r surface 84 extending from the upper e e of the weasel except at the surfaces which secure' valve seat 10. To the valve casing 6 bolts 46 secure a ring 48'havingahorizontal surface .86 which'cooperates with the horizontal surface 84 on the valve casing. Secured between the 'surfaces 80, 82 and 84 and 86 when the bolts 34 and 46 are tightened is a frangible seal 54.`

In the construction shown in Fi 6 the ring 48 is shown provided with a ange 50 which rojects upwardly beneath the groove 44 an has its outer bottom edge formed into a series of inclined cutting edges88, the lower corners of which will bear u on the seal 54 and graduall shear the sea as the valve is raised, by t e pressuure in the tank. The inclined cutting edges ma be appled to the constructions shown in igs. 3 an 4.

In the construction shown in Fig. 5 thel seal is ruptured by the strain put on it without the aid of cutting edges on the retaining rin In cases where the shearing action is desired, seals formedl from thin sheets of iron, brass or lead may be used, while where the rupturing action only is desired, seals .of brass, lead or v'rubber may be used.

In the action of this device the valve 12 will be held toits seat by the spring 16 until the pressure in the tank exceeds the pressure for which the s ring 16 is setl whereuponv Vthe pressure wi lift the valve causing the seal to be broken uponthe opening ofthe valve. The opening of the valve and the breaking of the seal will permit the discharge of the excess pressure from thetank. Uponthe discharge of the excess pressure from the tank, the broken seal may be replaced by lremoving the bolts 34 a'nd 46 and removing the rin s 36 and 48, whereupon the re,

48 in position on the sea' 1. In safety valve, a casing having a valve set, a valvefor said seat, a ring carried b ,said valve, a frangible seal secured to sai valve by said ring and means securiing said seal to said casing to prevent release of Huid pressure betweenthe valve and' said valve seat until said seal is broken.

2. .In a safety valve, a casing having an to said surface on said v ve by said ring and means securing said seal to said annular valve seat until said seal is broken. i

3. In a safety valve, a casing having an inclined valve seat and an annular surface surrounding and extending at an angle t0 said valve seat, a valve havlng a seat engaging. surface yieldingly held to said valve seat and a .surface lying above said seat engaging surface and extending at an angle thereto, an annular frangible seal engaging said last mentioned surface and the annular surface on said casing, a ring carried by said valve and having a flange holding said seal in position on the surface on said valve and a ring secured to said casing and holding said seal in position on said annular surface on said casing, said seal being broken upon movement of said valve vfrom its seat.

4. In a safety valve, a valve casing having an inclined valve seat and an annular surface surrounding said valve seat, a valve havingl a surface yieldingly held in engagement with'4 said valve seat andan annular 4surface at an angle to said seat engaging surface/an annular frangible seal, a ring carried by said valve having a ange'securing said sealto said annular surface of said valve and a ring carried by said casing having a flange securing said seal to said annular surface of said casing, a flange projecting upwardly from said ring on said casing and an outwardly extending flange `on said ring on said valve overlying sald upwardly projecting flange on said ring on said casing. l

5. In a safety valve, a'valve casing 'having an annular surface and a valve seat of less diameter than said annular surface, a valve having a surface normally engaging said valve seat and an annular surface adjacent to said seatengaging surface, an annular frangible seal overlying the joint between sald valve and valve seat, a ring detachably secured to said valve and having a flange securing said seal to sai'd vannular surface on said valve and a ring detachably .secured to4 said casing and securing said wardly extending flange forming. a groove with said first mentioned fiange and a ring detachably secured to said casing and having said valve.

a flange holding said sealV in engagement with said casing and an upwardly extending flange underlying said groove.

- 7. In a safety valve a casing having a valve seat, a valve yieldingly held to said seat, an annular frangible seal overlapping said valve and casing, said seal being placed on the side of the valve and valve seat normally free from pressure, and means s ecuring said seal to said valve and casing, sald seal being broken by said valve lupon open-4 ing thereof.d j

8. In a safety valve 'a casing havin va valve seat, a valve yieldingly held to said seat, an annular frangible sealoverlappin said valve and casing on the side thereo normally free from-pressure and means securing said 'seal to said valve and casing,

said seal being broken. by said valve uponY opening thereof `of said valve and said seal securing means being adapted to permit replacement of said -seal without dismantling 9. In a safety valve, a casing having a valve seat, a valve for said seatand adapted to be raised from the seat by fluid pressure Ion the bottom thereof, yielding means for holding said valve in contact with said valve seat, a frangibleseal voutside the surface of engagement of the valve with the valve seat, and. means vfor-securing the frangible seal to the valve and the valve seat to insure` 11. In a safety valve having afcasing, av

valve seat therein, and a valve engaging said seat, said valve and the adjacent portion of the casing having alined surfaces, a frangible seal on said alined surfaces, and retaining 'means on said casing and on said valve for normally positioning said frangible seal.

l2. In a safety valve, a casing having a valve seat, a valve for said seat, a seal retaining element secured to the said casing and positioned adjacent the valve seat, a ring detachably carried by said valve, and a frangible seal positioned across the valve seat and said valve and normally retained by said seal retaining element and said ring.

13. In a safety valve, a casing having a valve seat, a valve yieldingly held to said seat, and a frangible seal secured vto said casing and said valve on the side of the valve normally free from pressure,\said seal being broken by said v alve upon opening thereof to permit release of excess fluid under pres-` sure.

14. In a safety valve, an open e'nded cls` 10. In a safety valve having a casing, a

ing having a valve seat, a valve ''ieldingly held to .said seat, a franglble'sea overlappin the seat and valve in one open end of sai casing, and easily accessible means for 8 retainingsaid seal in its' overlapped position.

15. In a safety valve, an open ended casing having a valve seat in the upper portionthereof, a valve yieldingly held to lsaid seat,

a frangible seal overlapping the seat and 10 lapped position.

In Witness whereof vI have hereunto set my 15 hand. A

e VICTOR WILLOUGHBY.

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