US751281A - Rotary valve - Google Patents

Description

1\I0.751,281.` Y PATENTED'FEB. 2 1904.

R. GILLETTE.

ROTARY VALVE.

`.APPLICATION FILED 001.29, 1902.

No MODEL v 2 SHEETS-snm' 1.

..5 frog/v5 Ys., v

Y RANDOLPH GILLETTE, OF LITTLEFALLS, MINNESOTA,` ASSIGNOR `OF ONE- UNITED STATES y l Patented February 2, 1904.

PATENT OFFICE.

. HALF TO SPIRIT J. VASALY, OF LITTLEFALLS, lVHNNESOTA.

RoTARY VALVE.

SPECIFICATION forming part ef Letters Patent No. 751,281, dated February 2, 1904.

Appne'etiot ned @eater 29, 1902.

To all whom it may concern: i

Be it known that LBANDOLPH Gnmn'r'rn, a citizen of the United States, and a resident of Littlefalls, in the county of Morrison and State lin which similar characters of reference indicate corresponding parts 1n all' the figures.

Figure 1 is a fragmentary elevation of a steam-cylinder to which my invention is applied. Fig. 2 is a vertical longitudinal section through the rotary valve and its-accompanying parts. Fig. 3 is avertical cross-section of the same upon thel line 3 3 of Fig. l. Fig. t is a somewhat similar section upon the line-4 4 of Fig. l. Figs. 5 and? are sections in all respects similar to Fig. 3, Abut showing the revoluble valve-plug in slightly different positions. Figs. 6 and 8 are sections similar to Fig. 4, and also showing the revoluble valveplug in slightly different position-s. Fig. -9 is a horizontal section upon the line 9 9 of Fig. 8 and showing certain details in plan.

The steam-feed cylinder Ais provided with 'heads Al A2 and with a piston-rod 'A2, which passes through a stuiiing-bo'x A4 to a piston inside of said cylinder, these parts being of the usual construction. The cylinder is provided at its respective -ends' with theN rev'oluble valves B C, which are -connected together and are supplied with steam by means of the steam-fixtures D. l The live-steam pipe D is provided with a T D2, this 4T being fitted with pipes D3 D1, provided, respectively, with bifurcated pipes D5 D of substantially horseshoe form and terminating in ianged ends D7 D71. Connected with the iianged ends D7- are the flanged ends Bl of the nipples B2 and B3 of the rotary valve B. (See Fig. 9.) The Serial No. 129,235. (No model.)

casing of the valve B is shown at B2 and is provided with live-steamports B5 B5 and with a central cylindrical opening B7. The valve-casing is providedwith heads B2 B2, provided with bearings B10 B11. The bearing B11 has a stufling-box B12, 'as shown more particularly in Fig. 9.' 7 1 Revolubly mounted Withinv the cylindrical` which are slightly sunken therein andheaded down.V The webs B22 have substantially theV same length as the diameter of the plug-cylinder B17. y

Owing to the shape of the hubs B11 and the webs B22, the plug is provided with apertures B21, which serve as vsteam-passages when the plug occupies certain positions. My purpose in giving the revoluble plug a composite form is to preventy unequal expansion and contraction of the plug when thev same is subjected to extremes of heat or when one part of the 'plug is heated more than theother part. I have found that the composite form of plug is less liable toN bind ybecause of theexpansion and contraction peculiar to various degrees of heat. Preferably I make the cylinder B17 t a little loosely upon the webs B22 and then by means of the pins B23 secure the two members rigidly together. This constructionI permits, of slight relative movements due to expansion and contraction f and doesv not necessitate .as much distortion of the plug as would be the case if Aall of the movable parts were made integral. The upper vportion of the' valve-casing is provided lwith 'steam-passagesxB25B21 of the shape shown,and the lower portion of said legeeing is 'provided withv an `exhaust-passage steam-passages B25 and B26 of the'casing with the passages B24 of the plug. Stops B30 B31 are provided for limiting the movements of the plug C13, and consequently the other parts of the plug.

Lubricant-grooves B32 are provided within the casing B* at this point, as indicated more particularly in Figs. 2, 4, 6, and'8. rangement of these grooves is such that the pressure of the steam and the normal working of the revoluble plug tends to work the lubricant out into the points where it is needed, thereby insuring easy movement of the plug,

The structure of the valve C is substantially the same as that of the valve B, just described. The flanged heads C of the valve C are connected with the flanged heads DB of the bifurcated pipe D6. The live-steam port C5 (shown at the left of Figs. 3, 5, and 7) is analogous to the port B, already described. So, also, the live-steam port C is analogous to the livesteam port B5. Thehubs C13 are provided with webs C22, secured by pins C23 to the plug-cylinder C, this cylinder being provided with exhaust-ports C, C1", C20, and C21, as above described, with reference to the valve B, and the steam-passages C25 C2 C27 and the lubricant-grooves C32 have the same construction as the corresponding parts already described with reference to the valve B. The valve C is also provided with bearings, a stufIing-box, and with a crank C16.

The operation of my device is as follows: Steam being turned on through the pipe D', the cranks B16 C16 are simultaneously moved forward or backward, as desired, this being done by means of any well-known mechanical expedient. By the movement of the cranks the revoluble plugs are rotated backward and forward within certain limits. Figs. 3 and 4f represent the valves in such position that steam can leave, but cannot enter the cylinder A. The valves being moved slightly, asindicated in Figs. 5 and 6, steam enters simultaneously through the ports B5 B6 of the casing and passes through the ports B20 B21 tothe interior of the plug-cylinder B17, from whence it escapes at the open ends B28 B29 and also passes through the steam-passages B2G B25 to the cylinder, forcing the piston thereof toward the left in Fig. l. The exhaust-steam passes downward through the passages C25 C26 and passage C2* to the exhaust-passage C27, thus making its escape. The valves being moved still farther, they assume the position indicated in Figs. 7 and 8, so that steam can neither enter nor leave the cylinder A.

The object of the excessive movementsindicated in Figs. 7 and 8 is to enable the steamfeed to be stopped in case any obstruction should prevent the forward or backward movement of the cranks B16 C16 or any mechanism connected therewith for actuating them. In other words, if the workman finds that he cannot stop the steam-feed by causing the The arf cranks to pass backward he drives them foriWhere ports are in communication with cach `other by a saddle-shaped channel, as is sometimes the case, the walls of the casing are liable to spring and bind upon the plug, owing `to the excessive pressure of the steam.

I have found that valves for the purpose above indicated cannot be properly balanced except by feeding the steam through distinct and independent passages to different sides of the plug.

It will be further noted that all of my several improvements above mentioned conspire to form a valve in which all of the parts are worked freely relatively to each other.

The important part that passages Bi and C1E play in the proper working of the valve is that each of these passages are made in the plug-cylinder,` so as to balance the steam-pressure when steam is within said plug-cylinder, also to equalize the expansion ofthe plug-cylinder under different degrees of heat.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. In a` steam-feed rotary valve, the-combination of a casing provided with ports, a plug revolubly mounted within said casing and likewise provided with ports, said plug consisting of a revoluble central member provided with webs, a plug-cylinder mounted upon said central member and engaging thc edges of said webs, and aplurality of pins extending entirely through said webs and said central member, the ends of said pins engagsaid plug-cylinder.

2. In a steam-feed rotary valve, the combination of a casing provided with ports, a plug revolubly mounted within said casing and likewise provided with ports, said plug consisting of a revoluble central member provided with webs integral therewith, a hollow cylinder encircling said revoluble member and loosely engaging said webs, said cylinder and said webs being provided with holes registering with each. other, and pins passing diametrically through said webs and said central member, and engaging said hollow cylinder.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

RANDOLPH GILLETTE.

Witnesses WILLIAM KRAUSE, STEPHEN C. VAsALY.

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