US2623726A - Valve seat - Google Patents

Description

Dec. 30, 1952 C. 'R. SUSKA VALVE SEAT Filed NOV. 4, 1948 \N\ S W N s m\ N N m am\ P J l W M R W IN Or *me mwmkm- Pn NN mm G m uw? mm mw W5 um b* @n um ,rvxw h hh, Tm 92% Mmmm adv?? wh N um i @im u v 4 4\\.\ \.I Il /l NK K`x\ l T f lll Wb a n 2 m Il Patented Dec. 30, 1952 OFFICE vALvE SEAT iinriicsiiciiiivveetcr 4, wie serai No.. sans This invention relates to a valve seat, and has asits primary' object an improved valveseat which may be readily removed and replaced with a minimum of effort `and diiculty.

A further object of the invention is the provision of sucha valve seat which includes a resilient cylindrical member and a split `ring or band for holding the member in position interiorly of the valve body.

To the foregoing objects, and others which may hereinafter more fully appear, theinven tion consists of the novel construction, combination and arrangement of parts, as will be more specifically referred to and illustrated in the accompanying drawing, but it is to be understood that changes, variations, arid modifications may be resorted to which 4fall within` the scope of the invention as claimed.

The single gure of the drawing is a fragmentary vertical section of one form of float valve embodying the improved valve seat ofy the instant invention.

Referring to the drawing, the numeral I5 designates generally a valve body which is formed of a boss I6 having an annular an'ge I1 and an annulus I8 secured to and supported above the ange II by means of spaced connecting webs I9. The spaces between the webs I9` form iiuid outlet passages whereby the uid passing through the bore 2| of the boss I6 will. be discharged into a tank within which the valve 'structure ismounted. The body I5 also includesl at its inner end a boss 22 which is formed with a bore 23 substantially larger than the threaded bore 2| and the lower portion of the bore, 23 terminates in a transversely arcuate groove 24. The bore 23 forms a shoulder 25 constituting a seat on which a resilient ring-shaped valve seat member 25 is adapted to engage. The valve seat member 25 extends slightly above the top` or inner end of the boss 22 so that the diaphragm carried valve member may engage the upper or. inner end of the seat 25. The valve seat member 26 is xedwithin the bore 23 and the groove 24 by means of a split clamping band or ring 21 which engages the inner face of the seat lmember 2Ivand is formed with a bead 28 withinthe concave; inner side of which a locking ring 29 is adapted to Engage.

The body I5 has secured to the upper or inner end thereof a cap generally designated as 30, the cap 30 being secured to the annulus I8 by fastening members 3|. A exible diaphragm 32 is secured between the marginal portion of the cap 33 andthe annulus I 8 and extends over the valve seat member 26. The diaphragm 32 forms a 1 jm, (Cl. 251-19167) pressure chamber 33 between the upper side of the diaphragm and the inner side of the cap 3U, the purpose for which will be hereinafter described. The diaphragm 4hassecured to the lower side thereof a valve plate 3d which is formed with a downturned or curved marginal edge 35 and a second clamping plate 35 is secured to the upper or inner side of the diaphragm 32. The two plates 34 and 36 are heldin clamping position by means of a bushing generally designated as 31 which `extends through theA center of the two plates 34 and 36 and the diaphragm 32. The bushing 3l includes a substantially cylindrical body 33 having a lower flange 3 9 bearing :against the lower side of the valve plate 34. The b ushing 3l' also includes a reduced diameter nipple 4e extending into. thepressure chamber` 32 which is formed with an inner or top wall 4 I and also with a passage 42 which communicates the bore 43 of the nipple `with the pressure chamber 331. The inner portion of the` bushing 3ly is crimped o1 turned over as indicated at 44A so as to tightly secure the plates 34 and as on opposite sides of the diaphragm 3.2

The Plates 34 and iii are aiso'formed-cutwardly of the bushing 3J `wid-i annular beads 45 and 4t, respectively. which forni. additional clamping, 0r locking. meansfor tightly hoidinethe diaphragm .32 between the two Yplates, `Stand, SEL The lower or outer end of the bushing lthas extending tiiereacrossfa screen 4l and a can@ formed with apertures it engages over the screen 4l, being clamped` on an annularbead 5DV formed `on the bushing t? by mea-ris of a splityciampine ring 5l. In order to assist in the movement o f the diaphragm 32 to closed position Where the valve platetd` will engage the Yvalve seat 2 6, a spring 5,2 is interposed between the plate 36 andan upwardly offset central portion `53 formed in the cap 35,. The cap 33 hasformed therewith a boss 5d within which a bushing 55 isA threaded.

rEhe bushing. 55A is provided at; its lower or outer end with a needle AvalvehseatSE andat. its upper or inner end with` aA second needle valve seat. 5l. The cap 3i) `has extending upwardly therefrom on opposite. sides of-the boss 54:a.pair ofufpstanding ears 58 and the. bushingu554 is locked against rotation by means of a locking wire 59 vextending through the bushing 55 and through at least one ear 53.

A pressure release needle valve 60 is loosely disposed within the bushing 55 and is formed with a lower valve head 6I adapted to engage the seat 56 and is also formed with an upper valve head 62 engageable with the valve seat 51.

The needle valve member 60 includes a stem 63 extending upwardly from the valve head 62 and the stem 63 is formed with an annular groove 64 within which the slotted portion 65 of a float lever 66 is adapted to loosely engage. The float lever 66 is rockably mounted on a pivot pin 61 extending through the ears 58 and the lever 66 has secured to its inner end a hollow metal oat body 68, the body 68 being secured to the lever 66 by fastening means 69. The float 68 is formed of a pair of telescoping body members and 1| which are soldered or otherwise xedly secured together so as to provide a sealed buoyant iioat member.

A hood or shield 12 is secured about the'float 88 and is formed with a plurality of openings 15 so that fluid may freely enter the interior of the -valve head 6I is not used and is held against engagement with the seat 56 at the time the float lever 66 is rocked downwardly by lowering of the fluid level in the tank through the medium of a stop pin 13 which extends through the two ears 56. When the valve structure is inverted, valve head 62 is not used and the pin 13 is positioned in a second opening 14 formed through the ears 58 at a point confronting the relatively large pair of openings 15 in the hood 12 so that the pin 13 may be interchanged in either one of the openings provided for that purpose without 'removing the hood.

In the use and operation of this valve structure the valve body l5 may as herein disclosed be mounted in upright position with the boss I6 threaded onto the end of a fluid pressure supply source and mounted within a uid tank. With the valve structure I5 in an upright position and assuming that the liquid level is below the predetermined quantity, float 68 will swing downwardly, moving therewith needle valve operating lever 66 and lowering valve head 62 to open position with respect to the valve seat 51. Pressure chamber 33 will thereupon be open to the interior of the guard or hood 12 so that the incoming uid will move valve member 34 and diaphragm 32 upwardly to open position. The incoming fluid will fiow outwardly through the spaces into the main tank associated with this valve structure. At the same time that fluid is flowing through the valve seat member 26 and the passages 20 a small quantity of this iiuid will pass through bushing 31 and opening 42 into the pressure chamber 33. However, as pressure chamber 33 is at this time open by reason of needle valve 60 being in open position, the fluid entering chamber 33 will flow out into the shield or guard 12 and into the main tank. As the liquid level in the tank rises float 63 will be moved upwardly and when this float is moved upwardly to a point where needle Valve 60 is in closed or restricted position with respect to seat 51, pressure in chamber 33 will be built up in this chamber due to the fact that the uid outlet is either closed or smaller than the uid inlet. When sufficient pressure force has' been built up in pressure chamber 33 to overcome the pressure force of the incoming fluid, diaphragm 32 will move valve plate member 34 downwardly to engaging position with respect to valve seat member 26 and thereby out olf the flow of incoming fluid. The provision of the apertured hood or guard 12 eliminates the surging of fluid in the tank from unduly affecting the position of float 63. This valve structure has been designed particularly for use in fuel tanks of airplanes and especially the main fuel tank where the fuel is discharged from the auxiliary tanks.

In practice when valve plug 60 is moving to closed position the rate of exhaust of uid from pressure chamber 33 will be less than the rate of fluid entering chamber 33 so that pressure will build up in chamber 33 until the pressure force in this chamber overcomes the force of fluid against the lower side of diaphragm. When pressure force in chamber 33 is greater than the pressure force on the lower side of the diaphragm the latter will move downwardly to closed position. The pressure required to close diaphragm 32 may be built up in chamber 33 before valve 68 is completely closed.

I claim:

A valve seat for a oat valve structure comprising a body having a through passage and an annular groove adjacent one end of said passage said valve seat comprising, a resilient cylindrical valve seat member disposed in said passage and projecting from' said one end, a split cylindrical band bearing against the inner side of said seat member and formed with a bead engaging in said seat member whereby to press said seat member outwardly into said groove, said band having substantial width and reinforcing said seat member against distortion, said bead'having a concave inner side, and a resilient split locking ring engaging in the concave inner side of said bead whereby to lock said band and seat member relative to said passage.

CHARLES R. SUSKA.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 209,867 Craigie Nov. l2, 1878 269,886 Semple Jan. 2, 1883 679,456 Curtis July 30, 1901 925,538 Weaver June 22, 1909 1,521,745 Becker Jan. 6, 1925 1,538,108 Hagey May 19, 1925 1,676,084 Flagg July 3, 1928 1,709,678 Miller Apr. 16, 1929 1,839,144 Flagg Dec. 29, 1931 1,947,071 Walton Feb. 13, 1934 2,278,002 Thompson Mar. 31, 1942 2,366,520 Griffith Jan. 2, 1945 2,372,729 Molloy Apr. 3, 1945 2,491,521 Samiran Dec. 20, 1949

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