US323474A - Valve for steam-engines - Google Patents

Description

(No Model.) 3 Sheets-Sheet l.

P. L. WEIMER.

VALVE FOR STEAM ENGINES.

No. 323,474. Patented Aug. 4, 1885.

i (No Model.) 3 Sheets-Sheet 2. P. L. WEIMER.

VALVE FOR STEAM ENGINES. No. 323,474. Patented Aug. 4, 1885.

WIT/M8858 p MO MW 4 I n PiTERi. Fkolo-Llihognphon Wnhmgon. B. Q

3 Sheets-Sheet 3.

(No Model.)

P. L. WEIMER.

VALVE FOR STEAM ENGINES.

UNITED STATES PATENT @rricn.

PETER L. \VEIMER, OF LEBANOX, PENNSYLVANIA.

VALVE FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Patent No. 323,474, dated August 4, 1885.

Application filed Ma To ctZZ whom it may concern.-

Be it known that I, PETER L. WEIMER, a citizen of the United States, residing at Lebanon, in the county of Lebanon and State of Pennsylvania, have invented certain new and useful Improvements in Valves for Steam-Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which itappertains to make and use the same.

My invention relates to reversing-valves for steam-engines, and has special reference to its adaptation to that class of engines known to the trade as hoisting-engines, but is not limited thereto, as it may be applied to any engine adapted for reverse motion.

Prominent among the defects in the class of hoisting-engines now in use are the following: The supply-valve is placed at so great a distance from the ports leading to the cylinder that the engine runs an indefinite time after the supply of steam is cut off from the boiler, caused by the pressure or power of the steam contained in the supply-pipe and the steamchcst, which is all required to be worked off through the engine. The reversing-valve is subject to the pressure of the steam in the chest, which in large engines, requiring correspondingly large reversing-valves, renders it difficult to move the reversing-valve, and in many instances cumbersome machinery has been devised for the purpose of applying power to overcome this difficulty. In other instances auxiliary engines have been employed for moving the reversing-valve, as in large marine machines. Again, when the rev ersing-valve has been moved and the supply of steam from the boiler cut off, the steam contained in the engine-cylinder has been imprisoned, and the piston required to reciprocate in the cylinder against the pressure of the imprisoned steam.

The object of my invention is to construct an engine in which the difficulties and disadvantages enumerated are obviated.

To this end my invention consists in an enme in which the throttle or supply valve is located in close proximity to the ports leading to the cylinder, and in providing the throttle-valve with an exhaust-port to relieve y 15, 1885. (No model.)

the steam-chest of the steam contained there in, thus relieving the reversing-valve of the pressure of the steam heretofore acting upon it when required to be moved, and in adapting the reversing-valve to be moved to such a position as to put both ends of the cylinder in communication with the exhaust-port at the same time, all of which will hereinafter more fully appear, and be distinctly pointed out in the claims.

In the accompanying drawings, which form part of this specification, Figure 1 is a vertical longitudinal section of an engine-cylinder and steam-chest, showing the valves in position for running the engine in its forward motion. Fig. 2 is a similar view showing the position of the throttle and reversing valves when steam has been cut oii from the forward motion of theeng'ine. Fig. 3 is a sectional view of the valves in position for exhausting steam from both ends of the cylinder simultaneously. Fig.4 is a horizontal section of the steam-chest. Fig. 5 is a vertical transverse sect-ion of a steam-chest, throttle-valve, and cylinder at line y y of Fig. 1.

Reference being had to the drawings, in which similar letters refer to similar parts, A represents an engine-cylinder provided with the steam-ports B B G G and exhaust-port D.

E represents the piston, said ports being of ordinary construction, and provided with the usual appendages.

F represents the steam-chest, having an ranged therein a throttle or auxiliary steamchest, G, provided with steam-ports H H and an exhaust-port, I, having a throttle-valve, J, with corresponding ports, K K K.

In the upper side of the valve J is a recess, L, in which is fitted a movable socket, M, in which is fitted one end of an arm, N, projecting from the shaft 0, to the outer end of which is attached an operating-lever, P, which is provided with an elongated slot or opening, Q, and pivoted on a wrist-pin, It, of the connecting-arm S, attached to the outer end of the shaft T, from which projects an arm, U, fitted into a movable socket, V, arranged in a cavity in the one end of the reversing-valve -W, which is provided with ports a b c d c. This reversing-valve moves between its seat, formed on the cylinder, and the under side of the seat X ICO of the distributing-valve Y, of ordinary construction, known as the B-valve, the construction'of which is clearly shown in Figs. 1 and 4, and is provided with valve-rod f, to be coupled to an eccentric on the engine-shaft.

The seat X for the distributing-valve Y is provided with ports 9 h ij It.

To the cover of the steam-chest F is attached the steanrsupply pipe Z, which communicates with asteam-generator and the throttle or auxiliary steam-chest G.

From the foregoing description, reference being had to the drawings, the skillful mechanic and steam-engineer will readily understand the construction of my improvement without further description as to its construction. Therefore I will proceed to describe the operation. The several parts being in the po sition shown in Fig. 1, the engine will be working forward. The steam entering the throttle or auxiliary chest G passes from it through port 1-] into the steam-chest F, from which it is distributed and exhausted in the usual manner. \Vhen the engineer desires to reverse the motion of the engine, he moves the lever P in the direction indicated by the arrow on, thereby moving the valve J,through the medium of shaft 0 and arm N, into the central position, (indicated by the dotted lines in Fig. 1,) in which position the supply of steam will be cut off from the steam-chest F and cylinder A, and the steam in the steam-chest F will be free to exhaust through the ports H of the throttle or chest G and exhaustports K K K of the valve J into the exhaust-port of the chest G, thereby relieving the reversing-valve WV of the pressure of the steam in the chest F, when afurther movement of the lever 1? into a position mid way between the central dotted lines and those indicated by the letter a will place the reversing-valve WV in the position shown in Fig. 3, when any steam remaining in the chest F and the steam contained in the cylinder will be simultaneously exhausted through the ports, as indicated by the arrows in said Fig. 3, the distributing-valve Y having been moved into the position shown by the motion oithe engine. A still further movement of the lever P into the position indicated by the dottedline n in Fig. 1 will bring the reversing-valveWinto the position shown in Fig. 2, whereby the ports a and e of the reversing-valve are brought into communication with the ports 0 O of the cylinder, and the ports 9 and 7c of the valve-seat X of the distributing-valve Y, in which position the steam will be admitted to the cylinder for the forward motion of the engine.

The advantages of this construction will be readily comprehended in operatinghoistingengines in the act of lowering the elevator and its load, when the lowering action of the elevator and its load is controlled by frictional devices analagous to those shown in my application herewith filed. By locating the throttle-valve in the steanrchest the steam-passages are reduced to the minimum in length, the valve protected, and when the steamchest cover is removed all of the valves are exposed to view, and may be removed for repairs with the greatest facility. The socket M in the valve J and socket V in the valve W are susceptible of avertical motion, and their positions vary with the movement of the valves, as will be readily comprehended by reference to the drawings. If said sockets M and V were not adapted in their movements to harmonize with the movements of the arms N and U, the valves J and W could not be moved by said arms without loss of motion.

Having thus fully described my invention, what I claim is- 1. The combination of a steam-chest and a throttle-valve provided with ports to supply steam to and exhaust it from the chest, substantially as described.

2. The combination of a steam-chest, areversing valve, and a valve to relieve the chest of imprisoned steam when the supply is cut off, substantially as described.

3. The combination, with a steam-chest and its distributing-valve, of a throttle or supply-valve provided with an exhaust-port to relieve the imprisoned steam in the chest, substantially as described.

4. The combination of a steam-chest, a reversing-valve and a throttle or supply valve provided with an exhaust-port adapted to relieve the imprisoned steam from the chest and relieve the reversing-va1ve of the pressure thereof, substantially as described.

5. The combination of a steam-chest, a distributing -valve, a reversing valve, and a throttle-valve, the latter provided with an exhaust-port to relieve the steam-chest simultaneously with the cutting ofi of the supply of steam, substantially as described.

6. The combination of a steam-chest, a distributingvalve, and a throttle or supply valve contained within the steam-chest, substantially as described.

7. The combination of an engine-cylinder, a supply-valve, and a reversing -valve, the latter provided with ports, substantially as described, and adapted to be put in communication with both ends of the cylinder at the same time to relieve it of imprisoned steam, substantially as described.

8. The combination of a throttle-valve and a reversing-valve operated by the same mechanism and adapted to close the throttlevalve before the reversing-valve is moved, substantially as described.

9. The combination of a distributing-valve provided with two steam-supply ports, its seat, having two supply-ports on each side of an exhaust port, a reversing valve, and its seat, having ports to correspond with the ports in the seat of the distributing-valve, whereby upon moving the reversing-valve to register with the ports in the cylinder, as

described, after thesupplyis out off, the steam lever for imparting motion to the throttle- :0 in both ends of the cylinder is instantly exvalve, substantially as described.

hzuisted. In testimony whereof Yaffix my signature 10. The combination of a reversing-valve in presence of two witnesses. and a throttle-valve, a lever provided with an PETER L WYEIMER elongated slot, the arm connecting the operating shaft of the reversing-va1ve,provided with WVitnesses:

a pin to engage with said lever through the me- W. Mom-11s VVEIDMAN, dium of said slot, and a shaft connected to the JOHN A. WEIMAN.

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