US619088A - Cut-off valve - Google Patents

Description

Nu. rampas. mentari` Feb. 7, |899.

c. A. PETEnsoN.

GUT-OFF VALVE.

(Application led Har. 17, 1898.) (No Modal.) 3 Sheets-$heet l.

W Y l D F BY v ATTORNEYS.

Patented Feb. 7, |399.` C. A. PETERSON.

GUT-UFF VALVE.

(Application led Mar. 17, 1898.)

3 Sheets-.Sheet 2.

(No Model.)

. 1v ...if

/////////M///A E L A E W/TNESSES /W No. 6|9,088. Patented Feb.7,l |899.

C. A. PETERSON.

CUT-DFF VALVE.

(Application led Har. 17, 1898.)

.(No Model.) 3 Sheets-Sheet 3.

jrg f W/TNESSES /NVE/VZ? BY MMM@ ATTORNEYS.

UNITED STATES PATENT OFFICE.

CHARLES A. PETERSON, OF IIOT SPRINGS, SOUTH DAKOTA.

CUT-OFF VALVE.

SPECIFICATION forming part of Letters Patent No. 619,088, dated February 7, 1899.

Application tiled March 17, 1898. Serial No. 674,199. (No model.)

To all whom it may concer/fb.-

'Be it known that I, CHARLES A. PETERSON, of Hot Springs, in the county of Fall River and State of South Dakota, have invented a new and Improved Cut-Off Valve, of which the following is a full, clear, and exact description. i

The invention relates to cut-off valves for steam-engines; and its object is to provide a new and improved valve which is simple and durable in construction, very effective in operation, completely balanced, arranged to properly and automatically govern the engine according to the load, and adapted for use on ordinary steam-engines now constructed to render the same almost equal to high-grade engines, such as the Corliss and the like.

The invention consists of novel features and parts and combinations of the same, as will be described hereinafter, and then pointed out in theclaiins.

Reference is to be had to the accompanying drawings, forming a part of this specification in which similar characters of reference indicate corresponding parts in all the iigures.

Figure 1 is a side elevation of the improvement as applied. Fig. 2 is a sectional plan view of the same on the line 2 2 of Fig. l. Fig. 3 is a like view of the same on the line 3 3 of Fig. 1. of the same on the line 4 4 of Fig. 1. Fig. 5 is a side elevation of the main valve with the packing-plate removed to show cavity for the packing-springs.' Fig. 6 is an inner face view of the packing-plate, and Fig. 7 is a plan view of the main valve.

The engine on which the valve is applied is provided with the usual cylinder A, in which reciprocates the piston B, connected with the main driving-shaft C in the usual manner. The cylinderAis provided with the inlet-ports d and b and an exhaust-port c, the said ports registering with ports d e f, respectively, formed in the valve-body D and held within a steam-chest E, having a steam-inlet pipe E connected with a suitable source of steamsupply, such as a boiler or the like. An eX- haust-pipe E2 leads from the exhaust-port c (see Fig. 4) to carry 0E the exhaust-steam.

The valve-body D is formed with a cylindrical valve-seatvfor the cylindrical oscillating main valve F, made hollow to receive a Fig. 4 is a transverse section cut-ott valve G, likewise made cylindrical and arranged to oscillate, the said cut-oit valve being mounted to turn on a hollow valve-stem H for the main valve F, and through which passes thevalve-steln I for the cut-oit valve G, the said'valve-stems I and I-I being mounted to turn independently of each other, the stem H being controlled from the eccentric of the engine and the stem I from the governor of the engine, as hereinafter more fully described.

The upper end of the hollow stem H is provided with a hexagonal nut H, fitting into a correspondingly-shaped recess in a plate H2, secured to the topof the main valve F, so that when the said hollow stem H is turned a like rnotion is given to the main valve F. The other stem I is provided with pins I', extending through slots H3, cut in the hollow stem H and engaging the cut-of valve G, so that when the stem I is turned a like motion is given to the cut-off valve G without carrying the stem H along, as the pins I pass loosely through theslots H3.

The main valve F is provided with inletports g and h, adapted to register with the ports d and e, respectively, leading to the cylinder-ports to admit steam alternately to the ends of the cylinder. The ports g and h are also adapted to register with openings D D2, formed on opposite sides of the valve-body D, so that live steam from the steam-chest can pass through the said openings and the corresponding port g or h to the end of the cylinder to act on the piston therein in the usual manner. The ports g and h when connected with the corresponding port d or e are controlled by the cut-off valve G, and for this purpose the main valve F is provided with additional ports j and k, adapted to register with ports Z and n, respectively, formed in the cut-off valve G to connect the ports j and g with each other by the portland to connect the ports 7o and h with each other by the port fn. The main valve F is also provided between the ports g and h with a cavity c' for connecting the ports d and e with the port f, leading to the exhaust-port c.

As shown in Fig. 2, the cut-od valve G has just cut off the port g from the port j, so that live steam is cut off from the left-hand end of the cylinder, while the cavity i still con- I'co labove described.

nects the ports e and f with each other to allow the steam at the right-hand end of the cylinder to pass to the exhaust-port c and out of the exhaust-pipe E2. The port 7c, as shown in the said figure, is cut off at the front portion D3 of the valve-body D adjacent to the opening D2; but when a rocking motion is given to the main valve F then the port h moves in register with the port eand the port la moves into the opening D2, while the port 7' is cut o from the front D3, while the other port g opens into the opening D', and the cavityt' connects the ports d and fwith each other. Steam cannot pass through the port h to the ports e and b at the right-hand end of the cylinderA until the cut-off valve G has moved its port n in such a position as to register with the ports h and la.

An oscillating motion is .given to the main valve Fin the following manner: Near the lower end of the hollow valve-stem II is secured a segmental bevel gear-wheel J in mesh with a segmental bevel gear-wheel J', fulcrumed on a stud J2, carried by the cover E3 for the steam-chest. The upper end of the segmental gear-wheel J is formedwith an alined slot J5, in which is adjustably held a pivot K', engaged by the eccentric-rod K2 of v the eccentric on the main shaft C, so that vwhen the engine is in motion the said eccentric will impart aswinging motion to the bevel gear-wheel J', which transmits its motion by the segmental bevel gear-wheel J to the stem H, so as to rock the same, and consequently the main valve F, with which the stem is connected. By the arrangement described an oscillating motion is given to the main valve F to alternately bring its ports in the position wheel L', mounted to turn on a stud L2, carried by the engine-frame, as plainly indicated in Fig. 4. A sudden rocking motion is given to the segmental gear-wheel L'; but the latter, as well as the gear-wheel L, the stem I, and the cut-off valve G, is immediately returned to a normal position (shown in Fig. 2) by the action of the' springs L4 and L5, connected with the outer ends of the arms L2 and L3, extending in opposite directions from the stem I and at a right angle to the segmental gearwheel L, as is plainly shown in the drawings. The outer ends of the springs Ly L5 are connected with nuts L6, each fitted to slide in a guideway L7, carried by the steam-chest, the nut being engaged by a screw L2, screwingin the guideway, to move the nut forward or backward and increase or decrease the tension of the spring L4 or L5. On the front face of the segmental gear-wheel AL' is secured or formed a lug L2, in the upper end of which is pivoted a tooth N, adapted to be engaged by a friction-roller O, journaled in the lower end of a cut-0E arm O', extending on the front face of the segmental gear-wheel J' and formed with alined slots lO2 O2, through the latter of which passes a bolt O4, carried by the segmental gear-wheel J The upper end of the cut-off arm O' is pivotally connected with a link P, fitted to slide loosely ina bearing I2', mounted to turn on the steam-chest, the upnected with the arm Q' of a bell-crank lever Q, connected at' its other arm Q2 with a link R, connected with a bell-crank lever S, having one arm engaged by the sleeve of a governor T, so that the action of the latter imparts a swinging motion to the bell-crank lever S, and this motion is transmitted by the link R to the bell-crank lever Q. The motion of the latter causes the link P to impart a sliding motion upward or downward to the arm O', so that the latter, which rocks with the bevel gear-wheel J', moves the tooth N a greater or shorter distance to the right or left to give more or less rocking motion to the segmental gear-wheel L' and to the segmental gear-wheel L, the stem I, and the cut-off valve G. The tooth N is provided on opposite sides with curved arms N', over which the frictionroller O travels, the tooth, with its arms, being fulcrumed at N2 on a lug L9, and the said arms are pressed on by springs N2, carried by the said lug, so as to permit the arms to yield when the friction-roller O comes in contact with the same to guide the friction-roller to the tooth N, the arms being always incontact with the friction-roller to avoid the noise whichwould otherwise occur on the rollery packing-plates, as indicated in the drawings,v

to prevent leakage of steam.

The valve described can be readily applied to an ordinary engine by removing the steamchest cover and slide-valve and substituting 4the new and improved Valve and replacing steam-chest cover and making the proper conper end of the said link being pivotally con- IOO nection with the eccentric-rodand the governor. The valve is completely balanced, as the steam-pressure is equally divided both inside and outside ofthe main valve and the cut-off valve contained in the main valve.

As the main valve and the cut-off valve receive positive motion from different sources and move wholly independently of each other, but in the same direction, it is evident that the cut-off valve can move with the main Valve up to the point of cut-off and then rapidly close the main valve to prevent steam from passing to the end of the cylinder. As the valve has little or no lap, it will open readily and admit the greatest amount of steam in the shortest time with a quick cutoff to insure a proper expansion of the steam, and thus utilize the steam admitted to the fullest advantage.

By having an adjustable connection between the eccentric-rod K2 and the segmental gear-wheel J the main valve can be readily set to any desired stroke.

The cut-off valve can be set stationary to cut-oft or can be worked loose from the governor on pins constructed for that purpose, and it cuts oft according to the variations of the load of the engine, thus making the valve a strictly automatic cut-oft valve.

By the use of the springs L4 and L5, connected with the arms L2 L3 on the cut-oft valve-stem I, the cut-od valve is not liable to jump ahead of the port and is compelled to close correctly, as both springs pull toward a straight line extending through the center of the arms. The cut-oit valve by the action of the arm O, traveling with the segmental gearwheel J and acting at the same time on the tooth N, admits steam to the cylinder until the point of cut-off is reached, and the friction-roller O in releasing the tooth N permits the springs L4 L5 to instantly snap to their normal positions and cause the cut-0E valves to do the same and in a direction inverse to that of the main valve, so as to insure the rapid cut-off previously mentioned.

The main valve F rests with its lower end on a suitable step E3, carried by the steamchest E, and the valve-stem I is set at its lower end in a step on the engine-frame.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patentl. Asteam-engine comprisingahollow main valve, a gearing controlled from the eccentric and connected with the main valve to oscillate the same, a cut-off valve mounted to oscillate within the hollow main valve, a gearing for the same and means controlled by the governor for actuating the cut-o-valve gearing, substantially as shown and described.

2. A steam-engine valve comprising a main valve, gearing controlled from an eccentric for oscillating the said valve, a out-off valve for the said main valve, gearing for the eutoi valve, means for actuating the gearing of the cut-olf valve to oscillate the said cut-off valve with the main valve until the cut-0E point is reached, and means for suddenly returning the said cut-off valve to a normal eutoi position, substantially as described.

3. A steam engine valve, comprising a valve-body having openings leading into the steam-chest and ports connected with the cylinder-ports, a main valve mounted to turn in the said valve-body and having ports for registering with the said openings and the said ports in the valve-body, the said main valve being hollow, and a cut-o valve mounted to oscillate in the said hollow main valve to out ott the ports therein from the steam-supply, a'

segmental gear-wheel on the stem of the cuto'lt' valve, the said gear-wheel being in mesh with a similar gear-wheel mounted to turn on the engineframe,and means controlled by the governor for rocking the latter gear-wheel, substantially as shown and described.

4. A steam engine valve, comprising a valve-body having openings leading into the steam-chest and ports connected with the cylinder-ports, a main valve mounted to turn in the said valve-body and having ports for registering withV the said openings and the said ports in the valve-body, a segmental gearing connected with the main valve to oscillate the same and controlled from a moving part of the engine, a cut-off valve mounted to oscillate Within the said main valve to cut o the ports therein from the steam-supply, and means for operating the said cut-oft valve independently of the main valve as set forth.

5. A steam-engine valve comprising a valvebody having openings leading into the steamchest, and ports connected with the cylinderports, a main valve mounted to turn in the said valve-body and having ports for registering with the said openings and the said ports in the valve-body, the main valve being hollow, a cut-oft valve mounted to oscillate in the said hollow main valve, to cut off the ports therein from the steam-supply, a segmental gearing controlled from the eccentric ot' the engine and connected with the main valve to oscillate the same, a spring connection for the cut-oft valve, to quickly return the latter to a normal cut-off position, and means carried by the said segmental gearing for oscillating the said cut-off valve with the main valve until the cut-oft point is reached, substantially as shown and described.

6. A steam-engine valve provided with a main valve, a segmental gearing controlled from an eccentric, for oscillating the said valve, a cut-od valve for the said main valve, a gearing for the said cut-off valve, springs for suddenly returning the cut-oft' valve to a normal cut-oft position, and an arm moving with the said main-valve gearing and adapted to actuate the cut-off-valve gearing up to the point of cut-oft', substantially as shown and described.

7. A steam-engine valve provided with a main valve, a segmental gearing controlled from an eccentric for oscillating the said valve, a cut-off valve for the said main valve, a gearing for the said cut-oft valve, springs for suddenly returning the cut-oft valve to a normal cut-o position, and an arm moving with the said main-valve gearing and adapted to actuate the cut-ol-valve gearing up to the point of cut-off, the said arm being slidable on the said main-valve gearing and under the control of the governor,substantially as shown and described.

8. A steam-engine valve comprising a hollow main valve having a hollow-stem connection within the main valve, and connected with the end thereof, a hollow cut-off valve IOO IOS

IIO

*mounted to turn on the said stem Within the extending through slots in Jche latter stem and engaging the cut-0E valve to oscillate the latter independently of the main valve, means connected with the main-valve stem for oseillating the main Valve, and means connected with the cut-o-valve stem for oscillating the cut-o valve, substantially as shown and described.

CHARLES A. PETERSON.

Witnesses:-

WALTER ANDERSON, JNO. L. BURKE', JAMES BRADLEY.

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