US993921A - Automatic throttle governor-valve. - Google Patents

Description

0. A. A..O. WALKER AUTOMATIC THROTTLE GOVERNOR VALVE.

APPLIOATION FILED APR. 25, 1910.

Patented May 30, 1911.

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"Specification 01 Letters Patent.

Patented May 30, 19111.

lapplieation zfiled April as, 1910. serial no. traces.

inautomatic throttle governor valves for steam engines, and-the object of the present invention is the provision of an improved valve of this character which is interposed between the boiler and engineand is so con-' structed that variations in the pressure of the motive fluid in the steam engine su ply pipe will shift the throttle valve to a mit a greater or less amount of fluid to the engine cylinder, so-that the amountof steam which is fed to .the engine will ,be governed automatically in accordance with the load which is imposed thereon;

A further object of the present invention is the provision of a valve of this -.character in which thethrottle valve is normallymaintained in a balanced position, in combination with means .for adjusting the normal balanced position of such valvewhereby the speed of theenginezmay be controlled.

()ther objects of the invention will beapparent from the detailed description hereinafter when read inconnection with the accompanying drawings forming a part here: of, wherein .a oonvenientembodiment of the invention is illustrated.

In the drawing is shown a longitudinal section of-myimproved throttle valve.

Referrin ,now more particularly to the drawings, g designates a casin which comprises a chamber A with-whic a feed pipe A communicates, said ipe leading from a boiler or other suitab e source of steam supply, and a chamber B which is cylindrical in cross section and projects from, one end of the chamber A. The chamber B is provided with a port in the side thereof ad jacent its connection with the chamber A,

steam from the boiler feed pipe A to the steam engine supply pipe B is controlled by a valve C which is positioned within the chamber A and is of a-size to substantially fill the inner end of the chamber B when in its closed position. Movement of the valve G into the chamber 213 is revented by means of a plurality of projectlons 0 which project radially from the periphery of the valve and are adapted to overlie the inner end of the chamber B when the valve is shifted to close the communication between the chambers A and B.

D designates a piston which works within the outer portion of the chamber B, and the periphery of which ispreferably provided wlth suitable acking rings so as to make a steam tight oint between said piston and the" inner wall of said chamber. The piston D is provided with a small unobstructed port (23 which extends therethrough. The ,valve C and .piston D are connected by a rod E, or other rigid connection, so that they will move together.

Projecting from-the valve 0 is an actuating rod .F which projects through the front 'wall of the chamber A and into a casing which is secured to the exterior thereof. Interposed between a collar which is secured to the outer end of the rod F and anvabutment which is secured in the casing on the exterior of the head'of the chamber A is a coiled spring 7", which encircles the rod F. .The tension of the coiled spring is such that it will hold the valve C away from the inner end of the chamber B a sufficient distance to admit the proper amount of steam to pass from the boiler pipe A through the chambers A and B and into the engine supply pipe B, when the engine is working under normal condition.

While I have herein described one particular construction whereby the valve may be held in this position, it will be. understood that other constructions might be employed for this purpose.

Connecting the chamber A with the-outer end of the chamber B is .a by-pass G in which is positioned a valve g, of any-suitable type, by means of which the ,fiow of steam through such byass may be regulated.

Having thus ascribed the invention, the

operation thereof is as follows: Under normal conditions the tension of the spring 7 holds the valve 0, away from the inner end of the chamber B, thus permitting steam to pass from the boiler pipe A to the eng ne supply pipe B and thence to the englne chest. During this position of the valve steam also passes from the chamber A through the pipe G and into the outer end of the chamber Bin front of the piston D. Ihe valve 9 in the pipe G is so regulated relatively to the area of the port d 1n the piston that the steam supplied to the end of the chamber B will not accumulat therein but will flow through the port d of the piston. If now the engine is subjected to a heavier load than usual, the piston thereof will move more slowly which will cause steam to back up in the engine supply pipe and consequently increase the pressure of the steam in the chamber B in rear of the piston D. An increase of the ressure of steam in the portion of the cham er B in rear of .the piston D will serve to retard the flow of steam from the other side of the piston through the port d thereof, so that steam will accumulate in the outer end of the chamber B and the pressure on the outer face of the piston D will be increased and as the pressure on both faces of the piston tends to become equal, the spring f will act to open the valve C to a greater extent and thereby admits more steam to the engine to enable it to take care of the increased load which has been placed upon it. On the other hand, if the load on the engine is lightened, its piston will race and the pressure in the engine supply pipe and chamber A will be materially reduced. Reduction of the ressure in the chamber B in rear of the piston D will cause the steam in front of said piston in the outer end of said chamber, to flow with greater rapidity through the portd in the piston D and consequently reduces the normal pressure on the outer face of the piston and immediately the pressure on the outer face of the piston has been so reduced, the steam pressure on the face of the valve C will act to move the same nearer to the end of the chamber B and thereby throttle the passage of steam to the engine.

By means of the valve 9 in the by-pass G the amount of steam which passes to the outer end of the chamber B can readily be controlled, and by adjusting such valve it is possible to adjust the position at which the valve C will remain balanced, and in this way to readily regulate the speed of the engine.

While one convenient embodiment of the invention has been illustrated in the accompanying drawings, it will be: understood that the invention is not limited to the form and construction therein shown, as many eeaear changes may be made thereto without departing from the s irit and S00 e of the invention, as defined 1n the appen ed claims.

I claim:

1. In a device of the character described, a chamber adapted to communicate with a steam supply, a cylindrical extension extendin from said chamber and provided with an outlet port, a valve controlling the opening between said chambers, a ported piston connected to said valve and working in the cylindrical extension leading from said chamber, and a by-pass connecting said chamber and the extension thereof in front of the piston working therein.

2. In a device of the character described, a chamber adapted to communicate with steam supply, a cylindrical extension extending from said chamber and provided with an outlet port, a valve controlling the opening between said chambers, a ported piston connected to said valve and working in a cylindrical extension leading from said chamber, means for normally holding said valve away from its seat, and a by-pass connecting said chamber and the cylindrical extension thereof in frontof the piston working therein.

3. In a device of the character described, a chamber adapted to communicate with a steam supply, a cylindrical chamber provided with a steam supply pipe extending therefrom, a valve adapted to control the passage of fluid between said chambers, a ported piston working in said cylindrical chamber beyond the steam supply pipe extending therefrom, a spring normally holding said valve in a position permitting steam to pass through said chambers, and a by-pass connecting the chamber which communicates with the steam supply with said other chamber at av point in front ofthe piston working thereln.

4. In a device of the character described, a chamber adapted to communicate with a steam supply, a cylindrical extension extending from said chamber and provided with a steam supply pipe extending therefrom, a valve controlling the opening between said chambers, a ported piston connected to said valve and working in the cylindrical extension leading from said chamber, a by-pass connecting said chamber and the extension thereof in front of the piston working therein, and means for controlling the passage of steam through said bypass.

5. In a device of the character described, a chamber adapted to communicate with a steam supply, a cylindrical extension extending from said chamber provided with a steam supply pipe leading therefrom, a valve controlling the opening between said chambers, a ported piston connected to said valve and working in the cylindrical extension leading from said chamber, a spring 'for normally holding the valve in a position establishing communication between the chamber and the extension leading therefrom, and a by-pass connecting said chamber and the extension thereof in front of the piston working therein, and means for controlling the fiow of steam through said bypass.

6. In a device of the character described, a casing comprising an enlarged portion adapted to communicate with a boiler and a reduced portion leading therefrom and provided adjacent its connection with the enlarged portion with a port adapted to communicate with an enginevcylinder, a valve in the enlarged portion of the casing adapted to control the passage of fluid to the reduced portion of the casing, a piston working in the outer end of the reduced portion of the casing and provided with a reduced unobstructed port extending therethrough, a rigid connection between said valve and piston, a spring acting to normally hold said valve in a position to establish communication between the enlarged and reduced portions of the casing, and a by-pass connecting the enlarged portion of the casing with the outer end of the reduced portion of the casing.

7. In a device of the character described, a chamber adapted to communicate with a steam supply, a cylinder extending from said chamber and provided with an outlet port communicating therewith, a valve controlling the opening between said cylinder and said chamber, means for normally holding saidlvalve in a position to permit steam to pass from the steam supply-into said cylinder and from thence through the outlet port,a piston working in said chamber and connected to said valve, the portions of said cylinder in front and rear of said piston having restricted communication with each other, and a bypass connecting said chamber and the cylinder in front of said piston.

In testimony whereof I affix my signature in presence of two witnesses.

OSOEOLA AUSTIN ADQLPHUS OTHELO WALKER.

Witnesses:

L. H. RUNYAN, J. D. REEoE.

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