US380882A - James h - Google Patents

Description

(No Model.)

J. H, FOGARTY & P. M. WHEELER."

STEAM AGTUATBD VALVE.

No. 380,882. Patented Ar. 10, 1888.

N. P512515, Pholo-Lilhogmphen Washin t n, D.,c.

UNITED STATES P TENT @Trrcn.

JAMES H. FOGARTY, OF NEW YORK, N. Y., AND FREDERICK M. WHEELER, OF MONTOLAIR, NEW JERSEY.

STEAM -ACTUATED VALVE.

SPECIFICATION forming part of Letters Patent 1 To.380,882 dated April 10, 1888.

Application filed June 13, 1887. Serial No. 241,125. (No model.)

To all whom it may concern: Be it known that we, J AMES H. Foeanrv, New York city, in the county and State of New York, and FREDERICK M ERIAM WH ELER 5 of Montclair, in the county of Essex and State New Jersey, have invented a certain new and useful Improvement in Steam Actuated Valves, of which the following is a specifica tion.

1 Our improved pump is of that class in which the reciprocating action is effected by changing the action of the steam at the proper period in each stroke without the necessity for a fly- Wheel.

Our improvement relates to the provisions for admitting and discharging the steam, and changing the direction of its action at the proper time.

The following is a description of what we consider the best means of carrying out the invention.

The accompanying drawings form a part of this specification.

Figure 1 is a general side elevation. Figs.

1 and 1 are corresponding views of certain portions on a larger scale. Fig. 2 is a plan view of certain portions, with the cover of the valve-chest removed. Fig. 3 is a longitudinal section; and Fig. 3 is a corresponding section through a portion, showing the valve at one end of its throw.

Similar letters of reference indicate corre' sponding parts in all the figures where they occur.

A is the connecting casting uniting the pump-cylinder strongly and stiffly to B, the main steam-cylinder.

B is the main steam-chest, and O the main steam-piston, connected by a piston rod, 0, 0 with the pump-plunger. (Not shown.)

M is a casting, represented as forming a part of the steam-chest; but this may be varied. The two hollow cylinders in are bored in the casting M, with their axes parallel and up- 5 right. Inthese are mounted two piston-valves, P, connected by links Q to stout arms R on a balance-shaft, R. This is rocked through the medium of an arm, R, which is operated by the aid of a reciprocating rod, 6, which is reciprocated by steam-pressure, as will be presently explained. A pin, 1", on the arm R is mounted in ablock, S, which is received in a short vertical slot, 6, in the rod 6 to allow for the sweep of the arm R. The bearings of the balanceshaft R are carried in nicely-finished boxes or bearing pieces 0, mounted in recesses in the steam-chest. The steam is admitted through a passage to the lower part of the steam-chest. On removing the bolts which confine the steamchest cover access is obtained to the balance-shaft R and its attachments to allow of examination, cleaning, or repairs.

Ports 1) communicate between each end of the main cylinder B and suitable points in the corresponding upright cylinders m. Ports in communicate between higher points on the cylinders m and an exhaust-passage which leads out laterally and communicates with a suitable pipe (not shown) to convey away the steam after it has performed its function of driving the pump.

There is a port, of, opening from the steamchest into each cylinder at at the bottom. There is also a liberal opening along the axis of each of the piston-valves P. The steam filling the steam-chest exerts its pressure alike on the upper and lower faces of the valves 1? and of the several connections. The steam-pressure is balanced. The weight of the pistonvalves P and the links Q is balanced by the So connection of the latter to points at equal distances from the axis of the shaft R.

On the rod 6 is fixed a small piston, E, which works in a cylinder, W, actuated by steam supplied through a steam-chest, W, connected 8 5 by ports w. The steam is admitted and ex hausted alternately from each side of the piston E by means of a small slide-valve, V. Movement is given to this valve V through an arm, X, carried on a rocking shaft, X, which shaft extends out through a stuffing-box and has fixed on its outer end a sector, X, having set-screws m, as shown. This receives motion from a lever, Y, loosely centered at its upper end on X, and connected by a link, Z, to the 5 main piston-rod c at its lower end. The lever Y is swung with a motion corresponding to the reciprocating motion of the main piston (3. Near each end of its movement it strikes a screw, 00, and rocks the shaft X,which, through its arm X, gives a corresponding motion to the valve V. The set-screws a: can be set inward or outward to make the reciprocating motion of the valve partake more or less of the motion of the main piston. These are held firmly by jam-nuts, as shown. The set-screws can be thus adjusted to vary the action while the pump is working. This allows great facility for operating under the best conditions under all circumstances.

WVe have shown double ports communicating between the steam-chest W and the ends of the cylinder W. This is of advantage in cushioning the action; but we do not esteem it essential.

In the operation, the pump being supposed to work against a proper resistance, steam at high pressure is supplied to the small steamchest NV, and through the working of the valve V is admitted alternately to the opposite ends of the cylinder W, thus driving the piston E vigorously from one end to the other of this latter cylinder and causing it to cushion on the steam imprisoned by the pressure of the double ports 20. This piston E,through the rod 6 and transverse slot 6, turns the shaft It, raising one of the piston-valves P and lowering the other, the steam being also supplied to the steam-chest B, and thus to the space below each pistonvalve I. The piston-valve P, which rises,lets the steam under it flow through its port I) intoits end of the main cylinder B, while the opposite piston-valve (that which is lowered) allows the steam to be received through its port I) and to flow past its waist and escape freely through the exhaust-port m. Thus conditioned, with the steam exhausted from one side of the main piston and admitted to the opposite side the main piston 0 moves strongly and the pump makes a stroke.

The link Z, connecting the main piston-rod c with the lever Y, rocks the lever Y. This is of no effect until the end of the stroke is nearly reached. Then the lever Y strikes the proper set-screwx and commences to move the valve V. This valve and its ports have no lap, and as soon as this movement has progressed to a sufficient extent it exhausts from one end and admits the strong steam to the other end of the small cylinder W. The piston E, impelled thereby, acts through the rod 6 and its slot 6, and rocks the shaft R, effecting the required reversion of the positions of the two pistonvalves 1?. This operation involves a little time. In order to enable our pump to work rapidly, the parts should be set so that the movement will be initiated when the main piston lacks an inch or some other considerable space of the end of its stroke. The construction insures that the action is certain. The main piston O, with its connected pumpplunger, continues to move until the shaft R is rocked,,and this shaft does not commence to rock until the valveVhas been thrown sufficiently to reverse the action of the steam on the small piston E.

The rod e is finished accurately with circumferential grooves (2* dividing its surface into a series of rings, each separated from the other byalit-tle space. Jis atube,which is truly finished in its interior and extends from the steam-chest B to the steam-chest W. Its interior matches tightly but easily to the surface of the rod 0. The steam which passes a few of the first rings is obstructed in the spaces, and as there is an equal pressure for a portion of the time in the reverse direction the spaces become filled with steam and water at a tolerable pressure and there is no appreciable motion. The friction is slight.

Modifications may be made without departing from the principle or sacrificing the advantages ofthe invention.

We claim as our invention 1. The two piston-valves 1?, links Q, and arms R in combination with each other and with the main piston 0, rod 0, and a pump operated by the latter and with the arm 1%, rod e, piston E, cylinder V, and valve V, with provisions for operating the latter by the movement of the main piston, all substantially as herein specified.

2. In a steam-pump having balanced main valves I, actuated by a connected piston, E, the controlling-valve V, actuated by the motion of the main piston through connections, as Z Y, and provided with adjusting means 4r, whereby the intermittent motion imparted from the main piston may be varied, substantially as herein specified.

3. The close-fitting tube J, inclosing the circumferentially-grooved rod 6, in combination with the steam-chest B, cylinder V, and piston E, and means, as valve V, for distributing the steam to this cylinder,the said rod 6 operating through means, as the shaft'lt and its arms R It and connected piston-valves P, to distribute the steam to the main cylinder B, all substantially as herein specified.

In testimony whereof we have hereunto set our hands, at New York,this 7th day of June, 1887, in the presence of two subscribing witnesses.

JAMES H. FOGARTY. FREDK. M. WHEELER. WVitnesses:

M. F. BOYLE, CHARLES R. SEARLE.

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