Патент USA US2408710код для вставки
Oct. .1, 1946. ' - ¢_.E_ TWEEDLE ' ‘ HYDRAULIC RELIEF VALVE Filed Nov,. 22, 194sv I 2,408,708 ' ' 47 48 > // . 3mm” ' _C. E: ‘ TWEEDL E’ 2,408,708 Patented Oct. 1, 1946 UNITED’. STATES PATENT. @Eldl?h I ' 2,4083%. - HYDRAULIC RELIEF vnijvn I - . . ' _> Charles E. Tweedle, Great Lakes,iy>lll.gr assignor, by direct and mesne assignments, to: Theodore. .7 Placette, Hays County, Tex. V ' ' Application November 22, 1943, Serial No. 511,391 2 Claims; (01. 137-53)" 7 1 This invention relates to hydraulic relief valves and an object of the same is to provide a relief valve which is positive inoperation and at the sanie time is of ‘sturdy, simple ‘construction and embodies parts which may be easily manufac tured and assembled. Another object is'to provide a relief valve of the weight-biased type wherein the ?uid pres sure for operating the; main valve'is obtained directly from the main line carrying the ?uid to be controlled, the valve being devoid of exterior piping and‘ embodying a minimum number of parts which are readily replaceable ‘when re quired. ‘ I 2 I‘ movement ina liner 26 having a press ?t in the chamber‘ 20, said liner being ofhardened steel or like-‘wear-resisting material and said; piston being'provided with’ sealing orupackingrmgs 2-‘! v to insure against leakage between the piston and ‘ liner. .' ' Thejpiston 25 is'provided- with a port 2-8 in which is mounted a check valve 29- having a re stricted passage therethrough'to prevent entrap ment, of ?uid above. the piston when the latter moves upwardly and insure a‘ smooth operation or the latter in a- manner which will be more fully hereinafter explained.- ‘ . The'piston 25 and liner 26 constitute "an as ' Another object is to'provide a relief valve em 15 sembly which may be removed and replaced when the upper end of the chamber 20 is rendered ac bodying a main valve and a control unit for the cessible. : ' main valve which while coacting with the main rI‘he upper end of the main valve body or cast-> valve constitutes a separate assembly removable ing ll] isrformed with agflange 30, and" on this and replaceable whenever desired and devoid of springs, diaphragms, packing glands, etc., which 20 ?ange is mounted a plate-form‘cylinder head 3| tend to reduce the e?iciency. ~ v hy-means- of bolts 32,‘v the latter being removable ~ toE facilitate'removal and replacement of the head A further object of the invention is to im prove and simplify a relief valve of, the ?uid whenever found desirable or necessary; ' ‘ Removably secured on top of the cylinder head Operated type.. . r > ' The foregoing and other objects and advan 25 3| ‘is a control valve assembly‘ comprising a valve body 33 having inserted therein a valve bushing tages will become apparent in view of the fol 34 formed with'atepflange?éd ‘whichis re-> lowing descrip-tion taken in conjunction with the drawing, wherein: movablysecured to the "valve-body; 33 by means of cap screws 35. The lower extremity of the Y I The ?gure is a transverse vertical section. of control valve body 33. is formed with a seat 36 in which isyremovably disposed a valve seat 31v a valve in accordance with the invention. Referring to the drawing in detail, the’ valve.‘ assembly comprises a generally cylindrical main of suitablewear-resistant material, the said lat-7 ter seat being held in place by the lower edgev valve body or housing II) which may consist of a suitable casting and is formed with an inlet port H and an outlet or relief port l2. Between these ports, the valve body is ‘formed with a par tition having an annular passage in which is in serted a valve sleeve l4 provided at its lower end with a seat Ma, the sleeve and seat prefer-l ably being formed of hardened steel or like wear resisting material. ' > otthe bushing 34 and a v?ange 38 formed on the body 33, at this point, the said seat. 3lbeing in stalledin vposition ‘0n the. flange 38' prior toin sertioniofithe-bushing 3.4. . v. . a ' - . ' Above. the. valve seat .3l. the: bushing v34 is fo'rmedwith‘a relief valve chamber 39,4'and fluid is. conducted to this chamber from-the high pres sure side. of the system to be. controlled by means of control valve port rlllllwhi-ch at its inlet. end communicates. with the inlet port H and at ‘its ' A transverse partition l5 ishformed in the valve’ body or casting above the exhaust port or chane discharge extremity passes through the cylinder ne] ‘[2, and projecting .therethrough isv a’ valve stem 16 having a valve guide I1',>a valve disc 18 45. head 3!., relief valve body 33, and valve. seat 31. The] operating; ?uid’. passes .irom the chamber 39 and‘ a plate l8a secured on the lower end thereof by means of nut Ill. ' ' " ' ' through portv or passage "Il [and into. the. chamber ' 20‘ above the power‘ piston 25;"said -\po-r.t. orpassage Above the" partition 55 is an annularchamber, M being'formed'in the valvebody-33 and cylinder V 26 in which the upper end of the.‘ valve vstemilli has movement, the said stem above, the partition being encircled by a closure spring 2| .held in. place by means of washer, 22,, and nut 23, the. lower‘ end of; said spring encircling a’ boss 21].v 5.0. “ Passage of fluidvtrom the port 40 into the cham ber 39 is controlledby means-of valve member‘ 42 securedon'the lower end of valve stem 43,;the latter being mounted to slide. in the bushing 3'4. formed on the top of the partition .I 5. , A powerpiston >25, ‘ 1 ounted for reciprocatory: ' * and at its lower. end having an external ?ange ;44 2,408,708 3 which cooperates with an internal shoulder 44' in sleeve or bushing 34 to limit movement of stem or plunger 43 relative to the sleeve. It will be noted that the valve stem 43 is devoid of packing, leakage along the stem being avoided by means of a smooth tight ?t between this stem and the member 34 at the upper end of the chamber 39. This insures a smooth operation of the valve stem 43 at all times without danger of binding. 4 stood that the foregoing description is merely il lustrative, and further that certain minor changes in construction and design of the main valve assembly as well as control valve assembly may be made without departing from the scope of the invention as de?ned by the appended claims. What is claimed is: i I 1. A pressure relief valve comprising a gener ally cylindrical hollow casting constituting the 10 main valve body and having a ?uid inlet at one On the upper end of the valve stem 43 there is end, an external ?ange at the opposite end and secured a disc 45 which constitutes a weight table . a ?uid outlet adjacent said inlet, an apertured for supporting a series of graduated weights 46, transverse partition between said inlet and said the top weight being preferably provided with a outlet to support a valve seat, and a second lifting pin 47 which extends through a control 15 apertured transverse partition between said out valve cover 48 secured at its lower end to the let opening and said flanged end to provide a cylinder head 3| by means of bolts 49. piston chamber in the ?anged end portion of said In operation, ?uid from the high pressure side casting; a valve having a head cooperating with a of the system to be controlled exerts pressure on valve seat carried by said ?rst mentioned parti the valve member 42 through port or passage 48 20 tion and a stem extending through both of said and when this pressure rises the predetermined partitions and into said piston chamber; a spring amount (determined by the characteristics or surrounding said stem in said piston chamber conditions of the system or machinery to be con urging said valve to closed position; a removable trolled), it unseats the valve member 42 and per liner of wear resistant material in said chamber mits ?uid to- pass through port 4| into the cham 25 and a piston reciprocable in said liner and bear ber 29 above the power piston 25 to force the ing on the upper end of said stem; a plate cover latter downwardly against the compressive ac ing the flanged end of said housing and detach tion of the spring 2|, thereby unseating the main ably secured to said ?ange, said valve, piston and valve I8 and permitting ?uid under pressure to liner being removable from said housing upon pass from the main line into and through the 30 removal of said plate; a ?rst ?uid passage extend outlet l2. When this happens, excess pressure is ing through said valve body and said plate from released and the system resumes normal pressure said ?uid inlet to the outer side of said plate and whereupon the weights 46 close the valve 42 and a second ?uid passage extending through said the spring 2| forces the piston 25 upwardly and plate to said piston chamber; a pilot valve seats the valve l8. mounted on said plate and removable therewith ' The relief valve 29 insures a smooth action for comprising a hollow cylindrical member having the piston 25 since any fluid trapped on top of an external ?ange at each end and an internal said piston or between the latter and the cylin ?ange at one end, said one end being detachably der head 3| will flow through the restricted pas~ secured through the corresponding external sage afforded by the check valve 29 and through ?ange to said plate in position to cover the ends port 28 into chamber 20 from which it may escape of said ?uid passages; a hollow cylindrical valve to relief passage I 2 through a suitable opening sleeve inserted in said hollow cylindrical mem in partition I 5. Such an opening may be pro ber and secured to the ?ange at the end thereof vided by suitable clearance between the stem l6 remote from said plate, a valve seat in said hollow and the stem receiving aperture in partition l5. 45 cylindrical member between said internal flange If it is desired to test the valve while it is in and the adjacent end of said sleeve and having operation, this may be accomplished by lifting the top weight having the lifting pin 41 attached thereto thereby unbalancing the control valve. an aperture coaxial with said ?rst plate pas sage, a valve plunger slidable in said sleeve and having an end portion effective to close said aper~ When this happens, the pressure beneath the 50 tured valve seat and thereby interrupt ?ow valve member 42will unseat the latter and cause through said ?uide passages between said valve operation of the piston 25. If the valve closes inlet and said piston chamber; a weight table and when the weight is lowered to its normal position, weights carried by said plunger to urge saidend the operation of the valve should be normal. Fur portion to aperture closing position; and a cup thermore, this same expedient may be resorted to 55 shaped closure for said pilot valve having a in the event the valve stem‘ 43 or coacting parts ?anged open end detachably secured to said plate. should stick due to some unaccountable reason. It is a decided advantage of the valve that the control valve assembly is a complete unit in itself separate from the main valve assembly and may be removed and replaced at will. The valve seat 31 is readily removable, and this member is pref erably case hardened for long wear without leak mg. , 2. A pilot control valve assembly for a main. pressure relief valve having a plate form valve head provided Withya pair of adjacent ?uid pas sage apertures, said assembly comprising; a hollow generally cylindrical pilot valve housing having an external ?ange at each end and an internal ?ange at one end, the external ?ange at said one end adapted to be detachably secured to said valve The control valve assembly contains no springs, 65 head with said internal ?ange adjacent said head diaphragm or packing glands, and in the main and substantially concentric with one of said head valve assembly only one spring is used which need apertures; a valve seat of Wear resistant mate not be of delicate or precision construction. rial within said housing resting on said internal The liner 26 for the chamber 2i! is preferably ?ange and having an aperture coaxial with said given a press ?t, and simply by removing the one of the head apertures; a hollow sleeve pro head 3|, this liner can be removed and replaced vided with an‘internal shoulder, said sleeve being easily and conveniently at a slight cost. inserted in said housing and bearing at one end No attempt has been made herein to enumerate against said valve seat and provided at its oppo all of the advantages and features of superiority site end with an external ?ange detachably se of the improved valve assembly, it being under 75 cured to the corresponding external ?ange on 2,408,708 5 said housing; a fluid passage in said sleeve and said housing leading from the space within said sleeve at the side of said seat'remote from said internal ?ange'to the other ?uid passage aperture in said valve head; a valve plungerslidable in said sleeve provided-at one end with an aper- ' ture closing portion‘cooperating with said seat, at its opposite end with a weight table and inter 6 I mediate its‘ length with an annular ?ange 00 operating with said internal shoulder in said sleeve to limit movement of said plunger relative to said sleeve; removable weights on'said weight table; and a cover for said- pilot control valve adapted to be independently detachably secured to said valve head. CHARLES E. T’WEEDLE.