US298681A - Steam-actuated valve - Google Patents

Description

(NoModeL) I G. E. ELLIOTT.

STEAM AGTUATED VALVE. No. 298,681. Patented May 18,1884.

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GEORGE EDMUND ELLIOTT, OF OALAIS, MAINE.

o STEAIVl -ACTUATED VALVE.

SPECIFICATION forming part of Letters Patent No. 298,681, dated May 13, 18184. Application filed November 22, 1883. (No model.)

1'0 all whom, it may concern Be it known that I, GEORGE E. ELLIOTT, of Calais, in the county of Washington and State of Maine, have invented certain new and useful Improvements 'in Steam-Actuated Valves; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification, and 'in which- Figure 1 is a longitudinal vertical section of the valve-chest and a portion of the cylinder of a steam-pun1p provided with my improved steanractuated valve. Fig. 2 is a cross-section, and Fig. 3 is a horizontal section, of the valve-chest 011 line as 00, Fig. 1.

Similar letters of reference indicate correspondingparts in all the figures.

My invention has relation to stean1aetuated valves; and it consists in the improved construction and combination of parts of a valve actuated by the exhaust-steam, as hereinafter more fully described and claimed.

In the accompanying drawings, the letter A indicates the cylinder, B the valve-seat, and O the valve-chest, of a steam-engine or steampump, which cylinder may be of any desired construction, having the usual steam-channels, D, opening at the center of the valve-scat at ports E E, rather close together. Two ports, FF, open in the valve-seatone at each side of the steam-ports-and are continued through the valve-seat forming exhaust-channels G G, which open in the bottom of a smaller cylinder, H, one at each end of the same, which cylinder is placed above the valve-chamber proper and connected at its center with the same. The live steam enters at a port, I, in the side of the valve-chest, while the exhauststeam passes out at two ports, J J one at each end of the small cylinder, in the side of the sa1ne--forming exhaust-channels K K, uniting into an exhaust-pipe, L, at the side of the small cylinder. A piston, M, having two cylindrical heads, N None at each end-sliding in the ends of the small cylinder, the sides of which fit around the said heads, and a longitudinallyslotted semi-cylindrical center portion, 0,

slides in the upper cylinder, and a fiat upwardly-projecting lug, P, upon the upper side of the slide-valve Q, projects into the slot in the central portion of this piston, the valve sliding with the piston. The valve consists of two cups, R R, of sufficient length and width to cover and connect one of the steam-ports with one of the eXhaust-ports, a11d. are con nected by a yoke, S, at the lower end of the lug at such a distance from each other that when one steam-port is connected with its adjoining exhaust-port the other steam-port will be uncovered between the two cups, allowing the live steam to enter.

The valve-piston is connected with. the moving parts of the engine or pump in any suitable manner, so as to receive a start for its reciprocating motion, as the steam enters the livesteam port it will pass into the steam-port which at that time is left uncovered, into the piston-cylinder, and the exhaust escaping at the other end of the cylinder will pass through the steam-port into one of the lower exhaust-channels, into the corresponding end of the upper small cylinder, force the valve-cylinder forward,which assists in finishing the stroke of the valve, whereupon the exhaust-steam passes out through the upper exhaust-port into the exhaust-pipe. The valve will 110w receive a start in the opposite direction, when the exhaust-steam upon the other side will complete the stroke of the valve-piston upon that side, and so forth.

I am aware that slide-valves have been made sliding steam-tight in the valve-chamber, and conveying the exhaust-steam from the pistoncylinder through passages, to act upon its heads or ends for the purpose of finishing the stroke of the valve, and I do not Wish to claim such construction, broadly but I am not aware that valves have been made connected detachably with a piston sliding in a cylinder above the valve chamber, which valve distributes the exhaust-steam alternately to act upon the heads or ends of the piston while escaping, thus giving the piston, an d through it the valve, sufficient motion to finish the stroke and at the same time escaping freely out of the valvepiston cylinder; and

I therefore claim- The combination of a valve seat having steam-channels opening at the center, and 6X- after which it will be seen that haust-channels opening at the sides of the up into alug projecting into the slot in the steam channels, and extending upward, a piston, as'and for the purpose shown and set steam-chest forming a cylinder at its upper end, forth. 7

having ports at its ends connecting with the In testimony that Iclaim the foregoing as my 15 5 lower exhaust-channels,and ports openinginto own I have hereunto affixed my signature in the upper exhaust-pipes, and having the livepresence of two witnesses.

steam pipe entering atits side adouble-headed Y 1 piston sliding in the cylindrical portion of the GEORGE EDMUW ELLIOTT steam-chest, and having alongitudinally-slot- \Vitnesses:

1o ted central portion, and a slide-valve consist- WM. E. PERKINS,

ing of two cups connected by a yoke extending E. KNOWLTON.

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