US129726A - Improvement in slide-valves - Google Patents

Description

. SPECIFICATION. e We,'F. GLAssON, ofthe city of New York, in the county and `Statejof New Yorlr,'and W. UGILFILLAN, ofthe city of Paterson, in the county ofPassaic and State of New Jersey, i have invented certain Improvements in Steam- Valves forPumps, Src., of which the following e is a specification:

` This invention referstothat class of slidevalves used in steam force-pumps or other steam engines, and which, being actuated by tappets or stops on moving parts therein, are required to perform their functions with as little lost motion of the tappets as possible, in order to reverse the engine and pass the dead-Y point thereof; and the inventionl consists in the construction of the valve-seat and itsxed v abutment, and the combination with the latter of a valve of peculiar construction, which is reciprocated by the force of the steam acting betweenit and the said abutment, as hereinafter described. e

e Description of Drawing."

In our drawing, Figuresl and 2 represent our improved valve-seat.` Figs. 3 and 4 represent our improved valve seen from the under 4 part thereof and "in, section. Figs. 5 and 6 is the small valve used in connection with our valve to distribute the steam therein; and Figs. 7 and 8 represent our improved slidevalve on its seat, seen in sectional elevation and in two different positions thereof, so as to illustrate its workin g.v

General Description.

tion, working upon the ports G M P, so asV to admit or exhaust steam alternately through the ports Gr' P'. `M is the exhaust-port 5 M', theexhaust-pipe. B is thevalve-seat of our improved valve. This seat is planed true on Vits face, and is provided with holes b to fasten it to the cylinder of the pump or V'machine in which it is tobe introduced. V'Ihe seat B has two ports, D andE,whichare to communicate in the ordinary way with the two ends of the steam-cylinder.` B' is an abutment or partie and located between the two ports D and E. n `{I his abutment has straight sides opposite the UNITED ,STATES C is a little slide-valve of ordinary construe' `tion fastened to or forming part of the seat B,

PATENT OFFICE. l

e FREDERICK- `atAssoN,v or NEw YORK, N. Y., AND WILLIAM GILEILLAN, or rATEEsoN, NEw JERsEY.

IMPROVEMENT |N SLIDE-VALVES.

spcification forming part of` Letters Patent No. 129,v26,daed Julyea, 1872.

ports D and E, but the sides h t and h' t' are made sloping in order that the valve A, which is to work over the abutment B', may it snugly as well on the seat, on the sloping sides h t h' t', and 'on the top of the abutment B', and that all the rubbing surfaces may wear equally and make a steam-tight joint. We have repre- Y sented the end view (Fig. l) of our abutment B' as being of rhomboidal shape, but the abutment B' may be made of any desired shape which will allow of the valve A sliding freely thereon in .the direction -to and from the ports D E without losing steam. G' and P' are ports on the top of theabutment B' coinmmunicat` ing with the ports Gr and P of the seat B, whereon the small valve C is to work; but the valve may be placed anywhere relatively tothe valve A, provided always that the ports controlled by the little valve willcommunicate with the ports Gr' and P' of the abutment B'.

On each side ofthe abutment B' are` exhaustports M M. 'A is the slide-valve, for distributin g steam to the ports D and E for working" the engine to which it is attached. This valve `A has on its face two long exhaust-ports, I I,

to correspond to the ports D'and E, and two side ports, M' M', to correspond to the exhaustports M of the seat; andthese four ports on the face of the valve A communicate together and have no connection whatever with the inside cavity of the valve A. Said cavity, being a counterpart of the abutment B', fits snugly thereon, allowing the valve to slide in the direction of the arrows l and 2, Figs. 7 and 8, but being steamtight on the sloping sides h t h' t' of the abutment, on the top thereof also, as well as on the seat B. In the bottom of the hollow part of the valve Aarecut two small cavities, TT', which correspond to the ports G' and P' of the abutment B', as and for the purpose described further. The valve A being placed overpthe abutment B', the little valvev being placed on its seat G M I?, and a steam-chest being placed over the whole, the operation of our valve is as follows:

Operation of our Valve. n In Fig. 7 the steam is entering the port E, while the port D is exhausting through the port I, hollow valve A, ports M M to M',4 and the piston of the machine (not seen in the drawing) is working in one direction, until the tappet, by moving the little valve C, or any other valve answering the same purpose, admits steam into the port I" through the cut T', between the side of the abutment B' and the side of the cavity of the valve A, driving said valve in the direction of the arrow No.1 until the cut T' passes the opening P', which cuts off the steam, the valve A being in the position represented in Fig. 8. The steam is now entering the port D, while the port E is exhausting through I (same as above) to M'" until, the small valve being moved, steam is admitted through the port G' through T to space L, driving the valve A in the direction of the arrow No. 2 and the space K, exhausting through T' P' P' M to M' until the 'valve A is again as represented in Fig. 7, when the operation is repeated.

Claims.

Witnesses:

GEO. R. JAQUEs, E. GENGEMBRE HUBERT.

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