Патент USA US2375076код для вставки
May 1v, 1945-_ l I . Y, M. CASERTA' l ‘ 2,375,076 RELIEF AND BY-PASS VALVE ASSEMBLY ,Filed Dec. 4, 194s l’ ‘ i 2 sheetsL-sneet 1 N/c/z‘ele Caserta L May l, [email protected] - _ L M. CASERTA V ’ ‘_ 2,375,076 RELIEF: ’AN-DV BY-PASS VALVE ASSEMBLY _ Filed Dec, '4, 1943 2 Sheets-Sheet 2 f /// " .MLC/7de Cade/iwf'. 2,375,076 Patented May l, 194.5.'- UNITED s'TATi-:s `PATENT orrlci-z-RELIEF AND BVY-PASS VALVE ASSEMBLY ~ Michele caserta, Detroit, Mich., lasslgnor to ähompson Products, Inc., a corporation o! Application December 4, 1943, Serial No. 512,891 s claims. (olf. 277-45) This invention relates to a relief valve and more particularly to a relief and by-pass valve assembly for use in pumps such as pumps used for the trans fer of fuel in aircraft: v "~ ’ The present invention constitutes an improve ment over the valve construction described in my pending application Serial No. 397,763, ñled June ' 12, 1941. In‘ that application I have shown a ' nested assembly of elements constituting both a relief valve and a by-pass valve in a fuel pump Io aircraft. l , - ‘ FigureG is‘a sectional View taken substantially along the line VI-VI of Figure 5; Figure ’7 ls an enlarged sectional, exploded view' of the relief and by-pass valve assembly showing _the constituent elements thereof; and Figure 8 is .a sectional view of a stamped metal Icy-pass valve disk. » ` As shown on the, drawings: A The reference` numeral Ill (Figs. 1 and 2) indi 'cates generally an aircraft fuel pump with which a. relief and by-pass valve assembly of my inven tion is particularly adapted to be associated. Said pump lll comprises a pump casing Il, a valve housing l2 mounted thereon, and a valve housing ranged as to reduce any tendency of the -by-pass valve disk to become cocked, hut even if the by 15 cover I3 secured to said vhousing l2 and to the pump casing ll by means 'of bolts and nuts It. pass valve disk‘should become cocked, the con The pump here illustrated ls of the rotary vane struction is such that it cannot stick in operation. type, the bore of the pump casing. ll being pro vThe relief valve is provided internally with 'up-v According to the‘pi‘esent invention, the relief and by-pass valves are so constructed and ar standing, vertical ribs to serve as a guide for the by-pass valve disk, and the latter, because a disk like rather than a piston-type element, cannot he . come stuck even- if it should assume a cocked po vided with a pump liner I5 within which a rotor it is adapted to be driven. The pump casing ll is provided with anintake ll and an outletI lt ' for connecting the pump in a. fuel line-to an en gine, or other point to which fuel is to be _de livered. Internally, the pump casing is divided vided with a depending annular flange for partial ly enclosing and conñn'ing the upper end of the 25 by a partition lBA, on the intake side of whichV spring that urges the disk into closed position. ~ is formed a port lll, and on the outlet side of which isiormed a port Zt both of which are in flow com The lower, closed bottoni wallet the relief valve munication with interior portions of the valve is also upwardly dished centrally ior the purpose oi centering the lowerlend oi 'the ley-pass valve Said valve housing it is formed with an axially concentric, annular partition 2l, which, as best lt is therefore an important object ci this in shown in Figures 3 and 4, is integrally cast with vention to provide a relief and ley-pass valve as the valve housing it, to which it is connected by sembly of an improved construction whereby ease web portions it, it and tt. On the intake side and certainty of operation are assured and any 35 ci’ the partition tl, in conjunction with the web danger of the by-pass valve becoming cocked and it, said partition provides a pair of ports it and sition with respect to said ribs. The disk is pro housing li. spring. l , v ’ ` ‘ stuck is practically eliminated. Other and further important objects of this in vention will be apparent from the disclosures in the specification and the accompanying drawings. On the drawings: p y ' - Figure l is a top‘plan View of a pump with which my relief and by-pass valve assembly is particularly adapted to be used; v tito that are in communication with the port it and the ‘intake il. On the outlet side of said annular partition 2l it is open as at 2t (Fig. 2) to provide flow communication from the outlet> port 20 through a port 2l in the valve housing. to thefìnterior of said WMI-like partition 2l .` The inner upper edge of sa'. . partition 2| provides a relief valve seat 23, the full circumference of Figure 2 is a sectional view taken substantially 45 which is completed by a horizontally ext .ding along the line II-II of Figure 1, with parts in Portion `29 of said partition 2l. yThe interior `of elevation; « the valve 'housing iz is thus divided into ¿meer portion including the port 21 and an upper cavity. 3B. The lower portion ol’ the partition 2l is pro Figure ¿l is a sectional view taken substantially -50 vided With an open cylindrical bore 3| (Fig. 2) Figure 3 is a sectional View taken> substantially " -along the line III--III of Figure 2; . along the line ïV-IV of Figure 2; Figure 5 is an enlarged sectional view taken along a plane passing through the axis of the re-' lief and lay-pass valve assembly, removed from the pump housing; -_ Y ` of reduced diameter, for a purpose that will later appear. AA gasket 32 having openings conform ing with the ports I9 and 20, is suitably positioned between the pump casing H and the valve hous ing I2 for providing a tight joint therebetween. 2,375,076 Y 2 The lower annular edge of the partition 2| rests atively very light, being merely suñlcient to hold the by-pass disk 41 against its seat when the iiuid ' -directly upon said gasket 32. which is clamped betweensaid lower edge land the partition IBA of the pump. pressure above and below the by-pass disk is substantially the same. said by-pass disk 41 is depressed to permit the fuel to continue in its flow through the opening thereby provided and out through the ports 43, 21 and 2U to the outlet ` A relief and by-pass valve assembly, indicated by the reference numeral 33 (Fig. 5) is adapted to be assembled in nested relationship within the valve housing I2. Said assembly comprises `a side I8 of the pump casing. ' relief valve 34, suitably formed of a metal stamp In the operation of the by-pass disk 41, there ing with an upper, outturned cylindrical iiange 10 is no tendency of the disk to become cocked and 35 in sliding contact with the cylindrical bore 36 stuck, since the outer peripheral surface 43 is formed in the upperportion of said valve hous- ‘ rounded (Fig. 7) to give the effect of a thin cir ing I2, and with a lower closed bottom portion cular disk rather than that of a piston. Further .31, having an upstanding cylindrical side wall 33 more, the coiled spring 45 acts against the under slidable within the bore 3l. Said relief valve 15 side of said disk with a pressure that is uniformly 34 is further formed with an intermediate offset distributed about its complete circumference and portion 35, provided on its outer surface with a adjacent its outer periphery. The "spring 45 is beveled seating face 40; and on its inner surface itself centered by the upstanding central portion with a flattened shoulder 4|. Above the offset 44 in the closed bottom 31 of the relief valve 34 portion‘39, the side wall of the relief valve 34 20 and its top winding 'is confined within the de is provided with ports 42, while ports 43 are formed pendent ?lange 49 of said b_y-pass disk 41, so that in the lower side wall. The bottom wall 3l of the spring cannot easily bev displaced. In addi said relief valve is provided with an upwardly tion, the amount by which the spring 45 can be dished central portion 44 for the purpose of cen compressed is limited by the lower dependent tering a coiled‘spring 45, adapted to rest there 25 iiange l49 of the by-pass disk 41 striking against on. The lower side wall of said relief valve 34 the closed bottom wall 31 ofthe relief valve 34, is provided with inwardly extending ribs 46, which ' so that the spring 25 can never be compressed be are parallel to the axis of said relieî valve and yond its elastic limit. l which serve for guiding a by-pass valve disk 41, As a'matter of fact, the movement of the by as will later be explained in greater detail. 30 pass disk 41 is very slight in actual practice, since The by-pass valve disk 41 is formed with an the opening that is uncovered is of such large upper disk-like portion presenting an outer pe-. diameter as to permit substantially unobstructed riphery 48 for sliding engagement with said ribs flow of the fuel upon slight depressiony of the 46, and with a lower dependent annular flange 49 by-pass disk. for partially enclosing and confining the upper ' \ Between the valve housing cover |3uand the valve housing I2, a diaphragm 58 is clamped about end of said coiled spring 45. The by-pass valve disk 41 is also provided, on its upper face, with a its periphery by the same‘bolts I4 that hold the pump casing II, valve housing I2 and cover I3 together. With the relief valve 34 properly explained. ' . 40 seated, the upper face 59 of said by-pass valve 5I In Figure 8, there is illustrated a stamped extends into ktouching contact with said dia raised, fiat annular surface 5I) which constitutes the seating surface of the disk, as' will later be metal disk 41a having parts corresponding to phragm 58. those of the 'valve 41 designated by the same reference numerals with the subscript a. A lay-pass valve 5I is adapted to be nested with in the relief valve 34 to provide a seat for the bY-pass disk 41. Said member 5I is formed with a dependent annular flange 52 having 'an outside diameter equal to the diameter of the circle de A stamped metal washer 60I is positioned above said diaphragm 58 to-rest thereagainst with its downwardly oiîset peripheral portion 6I opposing the upper annular surface 59 of said by-pass fined by the inwardly extending ribs 46. The lower surface of said flange 52 provides a plane annular face 53 against which said by-pass disk 41 is adapted to be urged by the spring 45. Above said dependent annular iiange 52, the by-pa'ss valve 5I is provided with an'annular shoulder 54, the bottom face 55 of which is plane and adapted to rest upon and be supported by the shoulder 4I of the relief valve 34. A thin washer 56 of iiexible material, may suitably be positioned between the shoulders 55 and 4I to insure a seal therebetween. The upper portion of the by-pass valve 5I is provided with a plurality of radial ports 51 for permitting free iiow of ñuid from the upper chamber 30 through the ports 42 in the relief valve 34 to the interior of said relief valve 5| above the by-pass disk 41. . . Thus, in casethe rotor I6 is not operating and it is necessary to by-pass said rotor, the fuel can be caused to ñow under pressure, as by means of an emergency hand pump (not shown), up through the port I9, through the corresponding ports 25 and 25a in the valve housing I2, through the ports 42 in the relief valve 34 and through 4. valve 5|. , Said disk 60 is further formed with a semi-spherical, centrally depressed portion 62 for A second stamped metal disk 64 is formed with a complementary semi-spheri cal portion 65 which rests against said ball 63 to be centered thereby. Said disk 64 is also pro vided with a downwardly oiiset peripheral por tion 66 which forms a seat for the bottom turn . of a regulating spring 61 for adjusting the pres sure against said diaphragm 5" The regulating mechanism icludes a screw 68, which is adapted to extend through an opening ' 69, centrally positioned in the top of said cover UIL I3. _Said screw 68 is provided-with an integral flange 10, between which and the underside of the cover I3 is positioned a gasket 12. _A check nut 13 serves to draw the flange and gasket tight ly up against the under surface of the top wall of the cover I3 to provide a fluid-proof seal. A flanged disk 14 is operatively threaded upon the lower threaded end `of the screw 68 and is pro vided with an offset peripheral iiange 1,5 for ,bearing against the upper end of the coiled spring 61. For the purpose of guiding said disk 14, a ‘ receiving avball 63. plurality of longitudinally extending integral ribs 'I6 are formed on the inside of the side wall of said cover I3, and the peripheral iiange 15 of the ports 51 in the relief valve 5| to act against said disk 14 is recessed as at 1.1 for sliding en the by-pass disk 41. Since the spring 45 is rel' 76 gagement with said ribs. ‘I‘he screw 68 is further 2,375,076 valve structures of my invention should be ob served. With the valve housing l2 open, it is provided with a. screw-driver slot 18, bymeans of which the desired adjustment can be made from the outside, without removing the cover I3 or any accessory thereto. merely necessary‘to drop the various elements making up the assembly into place in "proper order, ñrst the relief valve proper 34, next the ’ To _accomplish the adjustment of the' regulating spring 61, and thereby regulate the amount of spring 45 and the by-pass disk 41, and finally the by-pass valve 5I. The gasket 56 can be c'on 'veniently slipped over the lower annular flange pressure exerted downwardly against the dia- . phragm 5B, it is merely necessary to loosen the 52» of the seat member 5I, before the latter is ` ` check nut 13 and turn the screw 68 in the desired dropped into place. Because of the guiding and >centering means provided, the parts nest into their assembled relationship without any partic ular care being required and without the neces direction. By virtue of the threaded engagement between the disk ‘lll and the threaded portion of the screw t8, said disk 14 will be moved upwardly or downwardly to lessen or increase the compres , sion force of the spring 6l. The slidable engage sity »of using any special tools to effect the ment between the ribs 16 of the cover I3 and the slotted periphery 'Il of the disk 1.4 prevents said assembly. , ' . ` Features of the pump construction here illus trated but not claimed are described and claimed disk lt from turning and insures a positive down- ' ward pressure against the spring 6l. 3 t in my copending application entitled "Rotary , pump,” Serial No. 480.278, filed March 24, 1943. Furthermore, any tendency of one end of the It will, of course, be understood that various spring tl to'be deflected from the horizontal due- 20 details of construction may be varied through a to movement of the disk 14 is neutralized by rea wide range _without departing from the princi son of the free mobility of the disk 64 about the ples of this invention and it is, therefore, not the ball td. As a result, only the axial component purpose to limit the patent granted hereon other of the tension of the spring is transmitted, with out any interfering factors, through the disk t4, 25 wise than necessitated by the’scope of the ap pended claims. the 'ball 63 and the disk 60 to the diaphragm 5t. What I claim is: . The downward pressure on the diaphragm is 1. A relief and lay-pass valve assembly, com further transmitted through the by-pass valve 5l prising a relief valve member having a closed to the relief valve til, through the gasket 5t, and a ribbed lower cylindrical side Wall whereby the relief valve is held against its seat 30 bottom provided with ports, a by-pass valve nesting in» with the desired Ipressure. . If it is desired, the interior of the cover it `may be connected through a bore, shown in Figure 1 to be closed by a plug it, to the supercharger. When so connected, the pressure upon the dia phragm 5t varies in accordance with the pres sure developed in the supercharger and is inde pendent of circumarnbient air pressure. ln the‘ operation of the pump illustrated here in, the relief valve 3d is prevented» from “chat tering” by reason of the dashpot action brought about by the construction shown. lSince the relief valve is provided with a closed bottom 3l, and the lower portion of the relief valve has a sliding nt within the bore Ell, this dashpot action is set up beneath said closed bottom 3l during movement of said relief valve either upwardly or down~ wardly. The relief yvalve ttl is also held against misalignment by reason of the upper cylindrical guiding surfaces >t'b which have a sliding fit with the internal wall of the valve housing l2, and by the lower cylindrical side wall 3d of said relief valve that has a sliding fit in the bore :il provided by the partition tl. _ side said relief valve memberand providing an _ annular seat, a by-pass, disk slidable along said ribbed side wall for- seating against said annular 35 seat, and a spring confined under compression between said closed bottom and said by-pass disk to urge the latter against said seat. 4 2. A relief and lov-pass valve assembly, com prising a relief valve member having a closed bottom and a ribbed lower cylindrical side wall provided with ports, a ley-pass valve nesting Kin side said relief valve member and providing an annular seat, a by-pass disk slidable along said ribbed side wall for seating against said annular , seat and having a` lower annular skirt, and a spring confined under compression between said closed bottom andV said by-pass 'disk within said skirt to urge the latter against said seat. 3. In a. relief and by-pass valve assembly, a stamped metal relief valve member having an up wardly dished closed bottom, a by-pass valve nested within said relief valve member to progA vide an annular seat spaced from said bottom, a ‘by-pass disk within said space having a dependent By virtue of the construction above described, the pressure of the fluid delivered by the pump annular skirt, and acoiled spring centered by said dished bottom and confined at the top by said annular skirt for urging said ‘oy-pass disk. against can be maintained at that desired.4 .In case the said seat. pressure tends to build up beyond that for which the relief valve is set, the fluid pressure acting upwardly against ‘the offset portion [email protected] of said relief valve 3d and against the _under `side of the byßpass disk ¿ll will tend to lift the relief valve td off of' its seat 23', and fluid will pass into the cavity td and through the ports ¿l2 and lil into the port lil on the intake side of the pump. Fluid also passes through the port t3 in the lower por tion of the relief valve 3ft and out through the opening provided when the seat 2t is uncovered. Since the opening provided when the valve 3d is lifted off of its seat 28 is of relatively largeldiam eter, the valve need b'e lifted only slightly to provide for the flow of a 4considerable volume of the fuel from the outlet to the intakeside of the pump. » , _ _ _ . The ease of assembling the relief and by-pass . 4. In a relief and by-pass Valve assembly, a stamped metal relief valve member having an up wardly dished closed bottom and a vertically ribbed cylindrical side wall extending therefrom, a lay-pass valve nested within said relief valve member to provide an annular seat spaced from said bottom, a by-pass disk within said space guided by said ribbed side wall for movement' therealong and having a dependent annular skirt, and a coiled spring centered by said dished bottom and conñned 'at the top of said annular skirt for urging said by-pass valve against said seat. 5. A relief valve comprising a stamped metal cup-like member having a closed bottom, an inter mediate external seating surface and upper and ’ . lower ported cylindrical‘side walls, the lower of said side walls being provided with vertical inter nal ribs for guiding a by-pass disk.A . _as 2,875,076 6. A relief valve comprising a stamped metal cup~likemember having a closed bottom, an inter mediate external seating surface and upper and lower ported cylindrical side walls, the lower of said side walls being provided with vertical in ternal ribs for guiding a by-pass disk and said bottom being upwardly dished centrally to center >the lower end of a coiled spring to be positioned thereon. » 7. A relief and by-pass valve assembly com priaing a stamped metal cup-like relief valve mem ber having a closed bottom, an intermediate ex ternal annular seating surface, and rupper and lower ported cylindrical side walls, the lower of said side walls being provided with vertical in ternal guiding ribs, said bottom being upwardly dished centrally, a ported by'-pass valve nested pendent annular skirt, whereby to urge said by pass disk against said lower annular seating sur face. 8. A relief and by-pass valve assembly comprising a stamped metal cup-like relief valve member having a closed bottom, an intermediate external annular seating surface, an internal annular shoulder and upper and lower ported cylindrical ,side walls, the lower of said side walls being pro vided with vertical internal guiding ribs, said bottom being upwardly dished centrally, a ported by-pass valve nested-within said relief valve to rest upon said internal annular shoulder and hav ing a lower annular seating surface, a by-pass disk having an upper peripheral annular surface for seating against said lower annular seating sur~ face, a thin disk-like outer surface for guidance along said ribs and having a lower dependent an nular skirt, and a spring between said by-pass within said relief valve and having a lower annu lar seating surface, a by-pass disk having an upper peripheral annular surfaceI for seating against 20 disk and said bottom centered by the upwardly said lower annular seating surface, a thin disk dished central portion of said bottom and con like outer surface for guidance along said ribs _and ñned within said dependent annular skirt, where having a-lower dependent annular skirt, and a by to urge said by-pass disk against said lower spring between said by-pass disk and said bot tom centered by the upwardly dished central por- tion of usaid bottom and confined within said de- - V annular seating surface. MICHELE CASERTA.