US1395756A - Valve - Google Patents

Description

W. A. McREYNOLDS AND R. BRIGGS.

VALV

APPLICATION FILED JUNE 20. 1919.

Patented Nov. 1, 1921..

hf /6 a? /0 /i'V/W/// gran stares;

VALVE.

Application filed June 20,

To all whom it may concern Be it known that we, WI LIAM 'A. Mo- RnYNoLDs and ROBERT BRIGGS, c1t1zens of the United States, residing at Hazelton, in

mitted, yet

the county of Barber, State of Kansas, have invented a new and useful Valve, of whic the following is a specification;

' This invention relates to steam engine cylinder valves and has for its object the pro-' vision of a valve ofthat type known as piston valves, that may be installed in the steam chest of engines already built, the same to take the place of the old type slide valve heretofore used.

Another object is the provision, of a piston valve casing of novel construction in which free passage of the steam to the ports is perproviding for uniform wear of the piston.

With these and other objects in view as will appear from the following description, the invention resides in the novel form and arrangement of parts hereinafter described and particularly pointed out in the appended claim, it being understood that minor changes may be made within the scope of the claim, without departing from the spirit or sacrificing any of the advantages of the invention.

In the drawing Figure 1 is a central longitudinal section I through a steam chest with the present invention applied thereto;

Fig. 2is a plan sectional view, taken on line 22 of Fig. 1; I

Fig. 3 is a transverse sectional view through the valve chest, and the same being taken on line 3-3 of Fig. 2;

Fig. 4 is a viewshowing the method of setting the valve in positionin the steam chest.

reference, the numeral 1 designates the steam chest of an ordinary steam engine using a D slide valve. In the present embodi- 6, top 7 and partitions 8 and 9. The compartments 3 and 5 constitute steam intake chambers and thecompartment 4 and exhaust chamber, the several compartments registering, when the casing is in position in the steam chest, with the corresponding Specification of LettersPatent.

Referring specifically by characters of,

Patented Nov, 1, rear. 1919. Serial No. 305,541.

ports in the steam chest. The end Walls 6 and 7 are each provided witha cage like boss 10 and a bore 11 is formed through the entire. structure. The bosses 10 are provided wlth openings 12 for the free passage of steam-to the compartments 3' and The bore 11 is provided'with a circumferential series of ribs 15 'for each of the compartments 3, 4 and 5,'the ribs bridging the space between the walls of the said compartments,

being formed diagonally with respect to the axis of the bore and about the circumference thereof, the spaces 14 between the ribs permltting the admission and exit of steam to the several ports in the cylinder.

A piston 16 is mounted forreciprocation vvlthin the bore 11 and is provided with piston head end portions 17 having piston rings 18, a reduced portion 19 connects the two ends and-a valve stem 20 connects the pistons with the valve operating mechanism of the engine.

For adjusting and securing the casing 2 in place in the steam chest, set screws 21 are provided, the same being threaded into the corners of the casing and are adapted to bear against the Walls of the steam chest,

so that the Valve casing may be adjusted to bring the ports or compartments in the valve easing into register with the ports 1n the steam chest and after the adjustment is made the set screws may be tightened.

up to secure the casing in position in the steam chest. Nuts 22 are then drawn up on the set screws to prevent the same becoming loose.

, The bosses 10 prevent the piston being pushed out of the bore during the opera tion of setting the valves, thus obviating the inconvenience of having the piston ring spring out of the bore.

The casing 2 at its bottom fits the steam chest 1 snugly, thereby preventing lateral movement of the casing in the steam chest,

the sidewalls 6 are therefore inclined in wardly toward the top of the casing to pro vide space for the free passage of steam to opposite ends of the steam chest.

In operation, steam from the steam chest enters to supply the chambers 3 and 5 through the openings 12 and through the ends of the bore 11, thence through the opening 14 to the cylinder. The control of steam and exhaust thereof is accomplished by the valve piston in the same manner as that of any ordinary slide valve an a detail.

description thereof is therefore deemed unnecessary. The arrangement and form of the openings or slit 14: prevent the piston being worn in grooves as would occur were 7 the openlngs formed parallel wlth the line of travel of the piston.

To locate the casing properly within the steam chest a tool of some kind, such for instance, as a steel square, must be used to proximately at right angles to the base of the steam chest, so that with one leg of a steel square resting on the base of the steam chest and the other leg in a vertical position it will be close to the ports in the casing and perfect alinement of the ports in the casing with those in the steam chest may be 7 effected.

To facilitate fitting the casing to the steam chest as above described a stand bolt 23 is threaded in the inclined side wall of the casing so that the casing may be supported in the position shown in Fig. 4;, in which position the compartments in the casing may be readily brought into register with the ports in the steam chest and then turned down on the base to be secured'in position.

What is claimed is z- In a device of the class described a steam chest and a casing in the steam chest, the chest and the casing having cooperating ports, thecasing including a wall having a bottom edge, said Wall being inclined with respect to the adjacent wall of the steam chest to provide for the passage of steam, the casing beingadapted to be swung away from the bottomof the chest and to be supported on said edgeto facilitate the alinement of the ports of the casing with the ports of the chest; and an element movable in said inclined wall and cooperating with the bottom of the chest to dispose the casing at right angles to the bottom of the chest when the casing is supported on said edge.

In testimony that we claim the foregoing as our own, we have hereto affixed our signatures in the presence of two witnesses WILLIAM A. MCREYNOLDS. RQBERT BRIGGS. Witnesses: k G. W. LIND EY, HOWARD E. STONE.

Images