USRE17375E - Vaivb - Google Patents

Description

S. J. NORDSTROM VALVE July 16, 1929.

ATTORNEY Original Filed June 12, 1926 Reiaaued July 1c, 1929.

UNITED STATES.

PATENT. OFFICE.

EIIBOI VALVE 001mm, DELAWARE.

! SAN FRANCISCO, CALIFORNIA, A. CORPORATION OI VALVE 01181111 I0. 1,634,722, dated I'll, 5, 1921, Serial I0. 115,418, filed June 12, 1928. Reissue 110. 175101 dated fietober 1|, 1828, Serial I0- ,074, fled AW 7, 1928. This use. Serial no. mm.

The invention relates to an improvement in valves, and more particularly to an im-' provement in plug valves of the type in which lubrication of the hearing or seating surfaces of the valve is efiected by forcing lubricant under pressure into the contact joint between the plug and the valve seat in the casing.

The pressure lubrication principle as applied to plug valves has heretofore been largely restricted to the heavier and more expensively constructed plug valves, but since pressure lubrication amures a properly lubricated and positively sealed or non-leakable valve, it has been proposed that this principle be apli plied to plug valves of the cheapest and'lightest construction, such as are used for gas and similar service. One of the uirements of this'kind of service is that the valve be sealed so as to be non-leakable. To prevent the valve from leaking it has been necessary to lap or grind carefully the hearing or seatin surfaces between the plug and its seat. T of course, adds to the cost of the valve.

One object of the present invention is to incorporate the pressure lubrication principle in plug valves of the very cheapest and lightest construction so that them valves may be manufactured even more cheaply than heretofore and yet be properly lubricated and sealed. Another object of the invention is to arrange the lubricating of .the valve in such manner that the plug ma be turned completely round in its seat, t is, through an angle of 360, without exposing the lubricant under pressure to the fluidpassingthrough "the valve. A more specific object of the invention is to provide a plug valve of this type with a system of lubricating ves oi such arrangement that when the p is in closed position the grooves on each si of the passageway through the valve seat cooperate to constitute a continuous groove complptely surrounding the way which may be filled with lubricant under pressure to prevent leakage first the plug. To the accomplishment of ese objects the invention consists in the improved plug valve more fully described hereinafter .and particularly pointed out in the appended claims.

In the amompanymg illustrating thepreferred formoftheinvmlhg hs application for reissue filed June 6,

a longitudinal section throu h the improved valve, with the plug in close position; Fig. 2

is a transverse section taken across the valve are sections taken along the lines 4-4 and 55, respectively, of Fig. 1.

The improved valve as illustrated in the drawings comprises a body part or casing 10 having a longitudinal pa ageway 11 therethrough and a tapered va ve seat 12 formed transversely of the passageway 11. Seated in the tapered valve seat 12 is a. tapered plug 14 having a hole 15 adapted to register with the passageway 11 when the valve is open, as shown in Fig. 3. These parts are formed as usual, but it will be observed from a consideration of the figuresthat the plug and the casing are of the lightest and cheapest construction. The side walls 16 of the casing are made as thin as practicable, and the plug 14 is hollowed outleaving only the relatively thin concentric walls 17 in its middle part. The longitudinal recesses 23 in-the valve seat 12 facilitate reaming the valve seat and so reduce the cost of manufacture. The parts are formed in this manner by casting.

The tapered valve seat 12 extends entirely through the casing 10. The plug 14 is held in the valve seat by means of a collar 18 and anut 19. The collar 18 bears against a circumferential flange 20 formed on one side of the casing and the nut 19 is threaded onto a stem 21 pro'ecting from the smaller end of the plug. The larger end 22 of the plug closes the larger end of the tapered opening throu 'h the casing. Projecting outwardly from 51c larger end of the lug is a valve stem 24 flattened to accommodate a wrench by which the lug may be manipulated to o andclose tl ie valve. It will be observed t at this arrangement of parts and the means for holding the plug against its seat is .of the aim lest, and is correspondingly cheap to p ucer. ,Usually the plug 14 is lapped or ground into its seat in orderto make a tight joint between them. According to the present invention the necessity for making a tight joint by protracted lapping or grinding is eliminated, since by means of the present inlength.

vention the joint between the plug 14 and the valve seat 12 is lubricated under pressure and any irregularities in the seatin or hearing surfaces of these arts are fille with lubricant and a tight joint therebly established. Moreover, according to one of t 0 features of the invention, when the plug is in closed position a seal of lubricant is established completely surrounding the passageway through the casin thereby positively preventing any leakage om one side of the line into the other.

The means provided by the present inven-. tion for lubricating the contact joint between the plug and the valve seat and for sealing this joint and the passageway through the casing, when the plu is turned to closed position as shown in ig. 1, comprises a plurality of longitudinally arranged lubricating oves 25 formed longitudinally in the bear mg surface of the valve seat 12. These grooves are V-shaped in cross-section and are preferably cast in the casing to save the cost of machining. In the illustrated embodiment of the improved valve there are four longitudinal rooves 25 spaced substantially 90 apart. ach groove is located adjacent to one of the lateral sides of the passageway 11 through the valve seat. The two longitudinal grooves at either the inlet or outlet side of the passageway constitute what is hereinafter termed a pair of longitudinal grooves. The u per and lower ends of the grooves 25 extend above and below the upper side 26 and the lower side 27, respectively, of the passageway 11. The use of the termsupper and lower with respect to various parts of the valve is understood to be relative only' and refers to the position of the valve as shown in the drawings.) Formed in the bearing surface of the upper or larger end of the plug and on opposite sides thereof are two transverse lubricating grooves 30, each ve bein substantial y 90 in length.

nd in the aring surface of the lower or smaller end of the plug and on op osite sides thereof are two transverse lubricating grooves 31, each move being substantially 90 in hese two pairs of transverse grooves 30 and 31, although arcuate in longitudinal section, as shown in Fig. 5, are rerded as parallel with the hole 15 through 1: e plu It wifi be observed by reference to Fi 1 and 2 that the grooves 30 are located a ove the lane passing through the upper edge 32 of the hole 15 and that the lower grooves 31 are located below the plane passing through the lower e 33 of the hole 15. The up r ed'ges 3411f t e grooves 30 are substantia ly in the same plane as the upper ends of the longitudinal grooves 25, and the lower ed es 35 of the grooves 31 are substantially in t 0 same aglans as the lower ends of the longitudin grooves 25, as clearly shown in Figs.

1 and 2. The two sets of grooves 30 and 31 are cast in the plug 14 to save the cost of machining.

By means of thisarran 'ement of lubricating grooves the novel mode of operation and the advantages of the improved valve are attained. It is possible to turn the plug through an angle of 360 without exposing a groove or grooves in which there is lubricant under pressure to the fluid passing through the line. It is possible to seal the passageway through the casing by surrounding the passageway with continuous or closed circuit grooves filled with lubricant under pressure when the plug is in closed position. And it is not .nccessary to accurately lap or grind in the contact joint between the lug and the valve seat because the travel of t y e plug past the longitudinal grooves 25 causes the plug to take up lubricant and smear it over the valve seat 12, thereby filling the irregularities of the incompletely machined surfaces, with the. re-

sult that the bearing surfaces are effectively lubricated.

When the valve is closed with the plug turned so that the hole 15is arran ed transversely of the passageway 11 and t e side 17 of the plug closes the opening through the valve seat, the two upper transverse grooves 30 span the upper ends of the two pairs of longitudinal rooves 25 and the lower grooves 31 span the ower ends of the longitudinal grooves 25, thus establishing around each end of the opening through the valve seat a continuous groove adapted to be filled with lubricant under pressure. And on the other hand. when the valve is open with the plug turned so that the hole 15 is in alinement with the passageway 11 the upper transverse grooves 30 span and bring into communication the upper ends of the two grooves 25 on each side of the casing, as shown in Fig. 4, and the lower transverse grooves 31 span and bring into communication the lower ends of the two grooves 25 on each side of the casing, as clearly indicated in Fig. 5. But in any intermediate position of the plug, the grooves 30 and 31 can be in effective communication with only two diametricall disposed lon itudinal grooves 25. The diametrically 1sposed longitudinal grooves 25 with which the transverse grooves 30 and 31 are in communication while the plug is in its intermediate positions are never exposed to the fluid passin through the line, because the grooves 30 an 31 are arranged parallelly with the hole 15. The other diametrically disposed grooves 25, the two with which the grooves 30 and 31 are not in communication, are exposed to the fluid passing through the line. But since these longitudinal grooves are cut oil from the transverse grooves at this time, only the small amount of lubricant that is in the exposed ooves can pass into the line or he attacked y the fluid-passing through the valve.

Thus by thepresent construction it is posible lower .of. the hole and with as" to stop the (.iplug at an point in its 360 of, the hole, eupperpairoftransverse grooves rotation an put the ln meant in the ves lying in the plane through the upper under pressure without forcing any 0 the lubricant into the line; And there isno waste-of lubricant, except the relatively small amount which may be dissolved or washed out of the exposed grooves.

under pressure into the grooves comprises a reservoir consisting of a hole'37 formed axially in the valve stem 24 and a cored hole 38 formed transversely in the upper or larger end of the plug 14 and-connectmg at its outer ends the two opposite transverse grooves 30, as shown in Fig. 4. The hole 37 in the valve stem 24 is threaded to receive a ressure screw 39 by which the lubricant in t e various connected passageways and grooves is put under pressure. I

Having thus described the invention what I claimas' new is: v

.1. A valve comprising, a casing having a longitudinal passagewaytherethrough and a tapered valve seat formed transversely of the passageway, a tapered lug seatedin the valve seat and having a ho e adapted to register with the passageway, means for-holdin the plug against its seat, the valve seat g provided with four longitudinal grooves s aced substantially 90- apart extending a oveand below, respectively, the passing through the upper and lower sides of the passageway through the valve seat, the bearing surface of the plug being provided at the largenend of the plugwith two transverse grooves lying in the plane passing through the upper ends of the longitudinal coves and at the smaller end of the plug with two transverse grooves lying in the plane through the lower ends of the longitudin rooves, each pair of transverse grooves eingsubstantia ly 90 in length and arranged parallel with the hole through the plug, the ends of each pair of transverse grooves being spaced substantially 90 a art, a reservoir III the plug for containing lu ricant, connections between the reservoir and onepair of transverse moves, and means for putting the lubricant in the reservoir under pressure to force it into the grooves.

2. A valve com risi a casing having a passageway theretlirou hhnd a tapered va ve -beingl eno hto The means for introducing the lubricant' t f planes ve seat and.

the fluid throug h ends of the longitudinal grooves and the lower pair of transverse grooves lying in the plane passing through the lower ends'of the on'gitudinal grooves, the transverse grooves span and no more two grooves when the plug adjacen ongitu' in closed and in 0pm position, a reservoir in the plug for containing lubricant con-' nected with one pair of transverse grooves, and means 'for putting the lubricant under .ressure to force it into the transverse and lhngitudinal grooves.

3.Avalvecomr a haviifia andataperedv ve pa? way there seat ormed transvel jy of the passageway, a tapered plug seated in the valve seat and aving a hole adapted to register with the passageway, longitudinal andtransverse 'grooves in the sea surface of the valve arranged to form when the lug is in its open and elem tions two etrically opposed cl circuit ves, a reservoir for casing containing plastic su connections between the reservoir and all e ooves when the plug is in its substantially open and closed positions on! and means for utt' tlizplAasticI substancz under pressure]: mg ve com rising, a casing a o i waytherethroug andataperedv ve seat formed transversely of the assageway, a tapered lugseated in the. ve seat and having a ole adapted to register with the passageway, longitudinal and transverse grooves in the seating surface of the valve arranged to'form when the plug in either its substantiall full closed or o -.1 position two diametri y opposed cluit grooves, and means for introducing under presure into the grooves, the longitudinal grooves being so, only supplied with lubricant under pressure wh ntheyarenot 0 Nu tothe fluidpassing through the valve, ut are cut oil from the supply of lubricant under presure when they are exposed to the fluid pasing through the .valve.

5.Avalvecom acasinghavinga p wa'yth andataperedvalve seat ormed ofthe' way, a ta plug seated m the valve seatand having a hole'ldapted to register with the pasagew'ay, longitudinal and transverse grooves in the seatingsurface of the valve arranged-to form I. continuous groove surrounding the way when the lug is in closed position, and means for in ucing-a plastic; substance under prwsure into the grooves, the longitudinal grooves so that they are only so plied with lubricant under pressure when are not to the valve, but are a plastic substance 05 that they are cut of! from the supply of lubricant under pressure when they are exposed to the fluid passing'through the valve.

6. A valve comprising},1 a casing having a passageway therethro and a valve seat formed transversely o the passa eway, a

plug seated in the valve seat and. aving a o e adapted toregister with the passageway, longitudinal and transverse grooves in the seating surface of the valve arranged to form when the lug is in its open and closed positions two iametricallyopposed closed circuit grooves, a reservoir for containing plastic substance, connections between the reservoir and all the grooves when the plu is in its substantially full 0 en and close positions only, and means or putting the plastic substance under pressure.

7. A valve comprising, acasing having a passageway therethrough and a valve seat ormed transversely o the passageway, a plug seated in the valve seat and aving a ole adapted to register 'with the passageway, lon tudmal and transverse grooves In the seating surface of the valve arranged to form a continuous groove surrounding the passage way when the plug is in closed position, and means for introducing a plastic substance under pressure into the grooves, the longitudinal grooves being so arranged that they are only supplied with lubricant under ressure when they are not ex d to the fluidas'sing through the valve, but are cut off rom the supply a plug member rotatablg of lubricant under pressure when they are exposed to the fluid passing through the valve.

8. A valve comprising a hav' a passageway for flow of u bore ormed transversely of the member id and a ageway, in said passageway and having a ole therethrough, the plug having a closed position in which the ole is out of registry with the passageway, a chamber adapted to receive lubricant under ressure, means for conducting lubricant rom said chamber to the cooperating or seat ing surfaces forming the sides of the plug and the bore in the casing, said means including two channels in said surfaces extending longitudinally of the plug, there being a channel between the passageway and the adjacent end of the hole on each side of the passageway when the plug is in closed position, one of said channels being exposed when the plug is rotated from closed to open position, an

lubricant ducts in one of said members serving to conduct lubricant from said chamber to said channels, said ducts serving to communicate with the said channels when the plug is in closed position, but being cut 011' from communication with the channel which is exposed upon turning the plug from closed ition, the cut-oi! between the ducts an channel being effected by said seating surfaces.

SVEN J OHAN NORDSTROM.

DISCLAIMER Re. 17,375.Sven Johan Nordstrom Oakland, Calif. VAL". Patent 16, 1929. Disclaimer filed No'vember 7, 1942, bythe Nordatrom Valve Gampan Hareby cums-this disclaimer to claim 8 in said specification.

[Qficial Gum Dewmba- 1, 1948.]

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