US687701A - Rotary cut-off valve. - Google Patents

Description

Patented Novfzs, |901.

V No. 687,70I.

u.- E. SMPLEY. Hamm cur-DEF vALvE. (Application led Apr. 17. 1901.) l

(No Model.)

UNITED STATES DAVID ELIIANNAN SHIPLEY, OF ROGERS, ARKANSAS.

ROTARY CUT-OFF VALVE.

SPECIFICATION forming part of Letters Patent No. 687,701, dated November 26, 1901.

Serial No. 56,289. (No model.)

T0 @all whom, it may con/cern:

Be it known that I, DAVID ELHANNAN SHIP- LEY, a citizen of the United States, residing at Rogers, in the county of Benton and State of Arkansas, have invented certain new and useful Improvements in Rotary Cut Oif Valves, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part hereof.

My invention has relation to improvements in rotary valves; and it consists in the novel construction of valve more fully set forth in the specication and pointed outin the claims.

In the drawings, Figure 1 is a middle transverse section taken through the valve and casing thereof. Fig. 2 is-a section at right angles to that of Fig. 1, taken on the line 2 2 of Fig. 1; and Fig. 3 is a detail showing the connection between the valve and shaf t ofthe engine.

The present deviceis animprovement on the construction of valves shown and described in my pending application for Letters Patent, filed February 10, 1900, Serial No. 4,822, and, like it, has for its object to construct a rotary valve which will operate with a minimum amount of friction, give a maximum amount of power and quick action,and take up its own lost motion. The present device has the additional advantage in that it is perfectly balanced, is adjustable as to the amount of leadopening, and Vhas other advantages better apparent from a detailed description of the invention, which is as follows Referring to the drawings, 1 represents a casing carried by or coupled to a suitable cylinder C, as usual, the casing having mounted therein a substantially cylindrical hollow valve 2, provided with the peripheral collars 3 3' and 4 4, arranged in pairs, the annular spaces between said collars being adapted to receive packing or expansion rings 5 5. Leading from the central cylindrical chamber 6 of the valve 2 is a port 7, adapted in its eXtreme positions to come opposite the ports 7' 7", (of the casing,) leading to the cylinder. Theouter peripheral wall of the valve is provided with walls or abutments 8 8 between the collars 3 4', the bases of which are parallel tothe axis of rotation of the valve, the walls and collars, together with the inner wall of the casing, forming an exhaust-chamber 9, from which leads the exhaust-pipe 10. When the valve is in position to allow for the port 7 thereof to communicate with port 7',` leading to the cylinder, the port 7" is exhausting past the abutment 8' into chamber 9 and out through the pipe 10. Vhen the valve has rocked to its other extreme position, so as to bring the port 7 thereof opposite the port 7, the piston will be driven in the opposite direction, forcing the exhaust through port 7` past the abutment 8, into the chamber 9, and out through the exhaust-pipe 10. The steam enters the interior of the valve through the steam-pipe 1l, which passes through one of the end walls of the casing and couples to a plate 12, provided with grooves for the reception of expansion or packing rings 13. Between the plate 12 and collar 4 and between the collar 3 and the front removable head 12 of the casing are annular steam-spaces 14 14, communicating through ports 15 with the inner chamber 6 of the.,` valve. By permitting the live steam to enter the spaces 14 14, as indicated, the pressure on the valve is equalized, and hence the friction thereof becomes also equalized, causing the valve to wear uniformly on all sides.

In order to properly regulate the lead of Steam passing -from the main valve 2 to the 4 engine-cylinder, l provide the valve 2 with a supplemental or regulating valve 2', comprising a plate which is approximately three times the width of the'port 7 and of a thickness equal to the width of said port and of a length sufiicient to lap over the port 7 at each end thereof. The stem 16 of the valve 2 passes loosely through the corresponding but hollow stem 17, feathered (or keyed) to the valve 2, the crank-arm 16 of said regulating-valve being coupled to the eccentric-rod 18 of a flywheel governor G of any approved type. (Not claimed.) The crank-arm 17 has its free end coupled to the eccentric-rod 19 of the driveshaft in the usual way. With the rotation of the drive-shaft the main valve 2 will be oscillated from one of its extreme positions to the other, the piston being reciprocated and the steam (or other motor fluid) exhausted, as already indicated. At the same time the governor G will oscillate the regulating-valve according to the speed of the engine, increas- IOO ing the lead-opening when the engine slows down and decreasing the lead-opening (by decreasing the length of oscillation) should the engine go too fast.

It is apparent,of con rse, that minor changes can be made in the valve without departing from the spirit of my invention.

Having described my invention, what I claim isl. A valve comprising a suitable casing, an exhaust port leading therefrom, suitable steam-ports leading to the engine-cylinder, a main valve rotatable within the casing, peripheral collars at each end of the valve, abutments disposed along the outer wall ofthe valve between the collars and thus forming an exhaust-chamber, a port leading from the interior of the valve and adapted for one of its positions to communicate with one of the steam-ports of the casing leading to the cylinder, while the exhaust-chamber is in communication with the other steam-ports ot' the casing leading to the cylinder, a live-steam passage being formed at. one end of the valve,

the opposite end being adapted to be coupled to the driving-gearof the engine, a regulating valve located and rotatable within the main valve and controlling the live-steam port thereof,and intermediate con neclion between said regulating-valve and the driving-gear of the engine for oscillating the former simultaneously with the main valve, substantially' as set forth.

2. A rotaryvalve comprising a cylindrical hollow body portion, terminal collars for the saine, a port leading radially outward from the interior chamber of the valve through the wall of the body portion, abutments disposed along the periphery of the body portion between the collars, one end of the valve having an opening for receiving live steam into the chamber thereof, a hollow stem at the opposite end, a regulating-valve located and rotatable Within the main valve and controlling the live-steam port thereof aforesaid, a stem connected to said regulating-valve and passing through the hollow stem of the first valve, the stems of the respective main and regulating valves being adapted to be coupled to the driving-gear of the engine, the parts operating substantially as, and for the purpose set forth.

3. A rotary valve comprising a cylindrical hollow body portion, terminal peripheral collars for the same, a live-steam port leading esaroi radially outward from the interior chamber of the valve through the wall of the body portion, abutments disposed along the periphery of the body portion between two adjacent collars, one end of the valve having an opening for receiving live steam, a hollow stem at the opposite end, a casing for the valve7 and an exhaust-port for said casing, a regulatingvalve located and rotatable within the main valve and controlling the lead-opening of the live-steam port thereof, a stem connected to the regulating valve and passing loosely through the hollow stem of the main valve, Crank-arms keyed to the respective stems, the crank-arm of the main valve being connected to the eccentric-rod of the engine-shaft and the crank-arm of the regulating-valve being connected to the eccentric-rod of the fly-wheel governor, the parts operating substantially as, and for the purpose set forth.

4. A valve comprising a suitable casing, an exhaust port leading therefrom, suitable steam-ports leading to the engine-cylinder, a main valve rotatable within the casing, terminal collars arranged in pairs along the periphery of the valve for the reception of eX- pansion or packing rings between them, an annular steam-space being formed around the valve between eachend ot the casing and the adjacent peripheral collar, ports leading from said spaces to the inner chamber ofthe valve, abutments disposed along the outer walls of the valve between two inner adjacent collars and thus forming an exhaust-chamber, a livesteam port leading radially from the interior of the valve, one end of the valve having an opening for receiving live steam, a hollow stem at the opposite end projecting through the casing, a regulating-valve located and rotatable within the main valve and controlling the opening of the live-steam port aforesaid, a stem carried by said regulating-valve and projecting through the hollow stem of the main valve and connected to the engine-governor, the stem of the main valve being coupled. to the eccentric-rod of the drive-shaft, the parts operating substantially as, and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

DAVID ELHANNAN SI-IIPLEY.

Witnesses:

L. E. KARNES, D. ADAMS.

IOO

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