US120269A - Improvement in valves for steamboat engines - Google Patents

Description

` n. HALEY. Improvement inVelves for Seamboat Engines. No. 12o

Patentedct. 24,187L

iineneee UNITED STATES ANDREW M. HALEY, OF SIOUX CITY, IOWA.

IMPROVEMENT IN VALVES FOR STEAMBOAT ENGINES.

Specication forming part of Letters Patent N o. 120,269, dated October 24, 1871.

To all whom it may concern:

Be it known that I, ANDREW M. HALEY, of Sioux City, in the county of Woodbury and State of Iowa, have invented a new and useful Improvement in Valvefor Steamboat Engines; and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled in the art to make and use the same, reference being had to the accompanying drawing forming part of this specification.

Figure 1 represents a longitudinal section of a steam-receiving and exhaust-pipe which is provided with my improved valve. Fig. 2 is a detail horizontal section of the valve on the line c c, Fig. l.

Similar letters of reference indicate corresponding parts.

My invention consists in the improvement in steamboat engine valves, as hereinafter fully described and subsequently pointed out in the claim.

A in the drawing is the steam supply-pipe, terminatin g in the upper part of an upright cylindrical chamber, B, whose open lower end communicates with the steam cylinder. O is the exhaust-pipe leading from the lower part of the chamber B. D is a tube open at both ends, f1tted within the chamber B through an annular plate, a, which separates the lower from the upper part of said chamber. The lower edge of the tube D is so shaped as to fit the valve-seat b at the lower end of the chamber B. The tube D, when lowered upon the seat b, as shown at the left-hand side of Fig. l, constitutes a valve for preventing the escape of steam from the steamcylinder to the exhaust-pipe, while, when elevated, as on the right-hand side of Fig. 1, it opens the exhaust. E is a circular valve, suspended from a rod, F, and shaped to fit the lower end of the tubular valve D. W'hen the valve D is raised to open the exhaust the valve E is also elevated, as at the right-hand side of Fig. 1, to prevent the supply of steam to the cylinder. When the hollow valve is lowered, as at the left-hand side of Fig. l, the valve E is also lowered, to permit the entrance of steam to the steam-cylinder, the exhaust being meanwhile closed by the hollow valve. To form the cut-off the valve E is drawn up into the hollow valve, and the dead-plate in that part of the valve E which first closes into the valve D forms the cutoft' as it is stopped on the up-motion with the cutoff before it quite draws into the seat ofthe valve D. To make the exhaust, the valve E is started on the 11p-motion and draws the hollow valve out of its seat. d Z are packing-rings, held down upon'the plate b by an annular follower, G, so that they contract around the tube D. Other suitable packing devices may be used instead. e e are screws, which pass through the cap of the chamber B, to hold the follower G iirm on the packing-rings. The pressure of steam on top of the hollow valve makes it follow the valve E down until it reaches the seat b. The valve E presses them still further down until the valve D is fully opened. There may be perforated `.guides f fin the tube D, steadying the motion of the stem F.

By the use of my hollow valve the exhaustchamber is done away with, aswell as considerable top-rigging of the engine, anda certain proportion of steam revolutions economized.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. A steam supply-pipe, A, and exhaust-pipe C, combined with a chamber, B, communicating with steam-cylinder and with said exhaust-pipe, as described.

2. The combination with said chamber B of the open-ended tube D, movable therethrough,V

and the exhaust O having valve-seat b, for the purpose speciiied.

3. The combination with said chamber B, openended tube D, and exhaust C having valve-seat b, of the circular valve E, all constructed to operate in the manner described.

ANDREW M. HALEY.

Witnesses:

J AErEs A. SAwYEEs,

GHAELEs H. BosTwIoK. (152)

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