US56841A - Improved slide-valve - Google Patents

Description

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UNITEDl STATES PATENT OFFICE..

A. n, woonRUFF, OF LANsINc', IOwA.

4IM PROVED SLI DE-VALVE.

Specification forming part of Letters Patent No. 56,841,` dated July 31, 1866.

To all 'whom it may concern:

Be it known that I, A. H. WOODRUFF, of Lansing, in the county of Allamakee and State i of Iowa, have invented a new and Improved Steam-Valve; 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 drawings, forming a part of this specilcation, in which- Figure l represents a longitudinal vertical section of this invention. Fig. 2 is a horizontal section of the same. Fig. 3 is a longitudinal section of a double-acting valve constructed according to my invention. Fig. 4 is a horizontal section of the same. Fig. 5 is an end view of the same.

Similar letters of reference .indicate like parts.

This invention consists in au angular valve which is iitted into an angular seat, one side ot which contains the exhaust and the other the steam port or ports, in such a manner that with a valve of comparatively small area large openings for the supply and discharge of the steam are obtained.

It consists, further, in the arrangement of recesses in the exhaust side of the seat or in the steam side, or in both, in such a manner that the pressure of the steam ,on the back of the valve is partially or wholly balanced and that a full supply of steam is obtained at the beginning ofthe stroke.

A A represent two valves, which are of angular form and fitted on corresponding angular seats B B', as clearly shown in Figs. 1 and 2 of the drawings. The seat B is provided with two ports, a b, the port a to admit steam to one end of the cylinder, and the port b to serve as exhaust-port; and the seat B is provided with corresponding ports, a b which serve as supply and exhaust ports, respectively, for the opposite end of the cylinder. The valves are hollow triangular boxes open on those sides which fit o n the steam-supply sides of the seats, and perforated with an oblong slot, c or c', on those sides which t on the exhaust sides of the seat, and the exhaust sides of the valves are provided with projecting flanges or lips d d', the object of which will be presently explained. Furthermore, the steam sides of the seats are furnished with recesses e e', and the exhaust sides with re cesses ff.

The operation is as follows: A reciprocating motion is imparted to the valves A A by a rock-shaft or any other similar means, and if said valves arrive in the position shown in Fig. l of the drawings the steam-port a begins to open and steam is admitted to the corresponding end of the cylinder, while the slot 0 in the valve A passes the edge ,of the exhaust-port b, thereby opening communication between the ports a and b in the seat B and allowing the steam from that end of the cylinder to exhaust.

By referring to the valve A it will be noticed that the same, as soon as the port c begins to take steam, is in such a position that steam passes through the recess e, and also through the recess f and slot c', to the interior ofthe same, and consequently the supply of steam is materially increased at the beginning of thc stroke, and at the same time the pressure ofthe steam on the back of the valve is partially or wholly balanced by the steam admitted under and to the interior of the valve. 'I hese valves can be readily combined with the reversing-gear described in Letters Patent granted to me December 27, 1864, or any other suitable reversing-gear may be applied to them; and in order to allow of reversing the valves the seats have to be of the proper length,and each seat is provided with two recesses, e or e', and with two other recesses, f orf', as clearly shown in the drawin s.

gfhis invention is applicable also to a doubleacting valve, as shown iu4 Figs. 3, 4, and 5. In this case the valve is divided into Atwo compartments, A* Ait, and the exhaust side of the valve is provided with two slot-s, c* ct,

while the angular seat is furnished with two steam-ports, a* att, and with two exhaustports, b* b't. The recesses f t in the exhaust side of the seat serve merely to relieve the valve of a portion of the pressure. In the position in which the valve is shown in Fig. 3 it just begins to take steam through the ports cd* and to exhaust through the ports a* and bit.

What I claim" as new, and desire to secure by Letters Patent, is

1. The angular valve, either double-acting 2 seem or single-acting, in combination with a oorrevalve-seat, in combination with the angular spondingly-angular seat,snbstuntia11y as and valve, substantially as end for the purpose for the purpose described. set forth.

2. The recesses f f in the exhaust side of the Valve-seat, in combination with the angu- A' H' WOODRUFF' lar valve, substantially as and for the purpose Witnesses: set forth. M. M. LIVINGSTON,

3. The recesses e e in the steam side of the WV. HAUFF.

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