US1177864A - Valve. - Google Patents

Description

A. E. HODGDON.

VALVE.

APPLICATION FILED APR. 4, 1914. Patented Apr. 4, 1916' 2 SHEETS-SHEET I.

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A E HODGDON.

VALVE.

PPLIC Tl 7 1,177,864. A A mu m 4 Patented Apr. 4,1916.-

2 SHEET SHEET 2.

flrmzzm g Atto eys ABTEMUS E. HODGDON, OF SPRINGFIELD, MISSOURI.

VALVE.

Specification of Letters Patent.

Patented Apr. 4, 1916.

Application filed. April 4, 1914. Serial No. 829,650.

T 0 all whom it may concern:

, Be it known that I, ARTnMUs E. HODGDON, a citizen of the United States, residing at Springfield, in the county of Greene and State of Missouri, have invented a new and useful Valve, of which the following is a specification.

The present invention relates to improvements in valves, the same being especially designed for use as the drifting valve of steam locomotives and also as a pressure reducing valve for steam, air, or other pressure fluid as well, one object of the invention being the provision of a novel structure which will automatically close a main pressure fluid valve and thus reduce the pressure directed for operating purposes when the mechanism controlled thereby is not running at a maximum speed, the present structure being automatic in its action, and especially economizing steam when the same is used as the drifting valve of a locomotive.

A further object of the present invention is the provision of a novel structure including a piston actuated main valve controlled by a piston actuated slide valve so that the pressure fluid used to actuate the piston of the main valve will be led thereto and thereaway from at the proper time.

With the foregoingand other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made with in the scope of what is claimed without departing from the spirit of the invention.

In the drawings-Figure 1 is a sectional view through the complete structure with the parts in their normal positions, the main valve being open so that the pressure fluid is free to flow through the casing. Fig. 2 is a similar view with the main valve closed. Fig. 3 is an enlarged section taken on line 3-3 of Fig.2. Fig. 4 is a modified form of slide valve actuating mechanism shown in section. Q

Referring to the drawings, the numeral 1 designates the valve casing which is provided with the inlet pressure directing channel 2 and the outlet pressure directing channel 4 which is in communication with the first channel 2 through the main valve port 3. A valve 5, which is the main valve, is

disposed above the port 3 to open and close said port, the same being a cylindrical valve provided with a concentric lower socket 6 for the sliding reception of the upstanding pin 7 which is carried by the adjusting screw 8 carried by the casing below the port 3.

A piston 9 is disposed above and connected to the valve 5 and works in the reduced portion 10 of a cylinder 10 fitted in the easing 1 to prevent the pressure reaching the underside of a piston 13 disposed for sliding movement in the enlargedportion 11 of the cylinder 10. The cylinder 10 is fitted in a vertical bore with which the casing 1 is provided above the channel 4, and a plug 14 is threaded into the upper end of said bore to hold the cylinder 10 therein. The plug 14 has a port 15 normally closed by a plug 15. The cylinder 10 has a port leading to the atmosphere and located adjacent the shoulder between the portions 10 and 11. The pistons 9 and 13 and valve 5 are preferably integral, they being carried by a reduced portion'or rod 12, and the piston 13 is of larger diameter than the piston 9 so that the valve 5 will not be balanced.

The casing has a port 16 led from the pressure fluid directing channel 2 intermediate of its inlet end and the port 3, and said port opens into the lower end of a vertical chamber 17 with which the-casing is pro vided and the casing has an exhaust port 18 leading from the chamber 17 and a pressure fluid directing passage 19 establishing communication between the chamber 17 and the upper end of-the cylinder 10 above the piston 13. By this means it will be seen that the pressure fluid directed through the port 16 will enter the passage 19 and thus depress the plunger or piston 13 so as to cause the valve 5 to assume the closed position, as'

illustrated inFig. 2.

A combined pressure actuated plunger and stem 20 is mounted for sliding movement through the packing rings 21 which are suitably mounted within the detachable upstanding casing 23 whose threaded end or plug 2 1 is engaged to the casing 1 in the upper end of the chamber '17. A coiled spring 25 is mounted to compress the packing rings 21 while a disk 26 seals the upper end of the chamber 17 adjacent the plug 24 and also maintains the spring 25 in proper place. The stem 20 is reduced at its lower end Within the chamber 17 to provide the sbouli der 28 at the end and the shoulder 29 so that the valve member 30 may be properly positioned thereupon and carriedv thereby in its vertical movement within the chamber 17. Under normal pressure conditions, the valve 30 assumes the upward position, as shown in Fig. 1, at which time the port 18 and passage 19 are in communication by way of the by-pass 33 of the valve 30 and the valve 5 is elevated so that the pressure fluid will flow directly from the channel 2 into the channel 4. The valve 30 is provided with the segmental head 32, whose outer curved face is recessed to form the by-pass 33, and the valve 30 will close the port 18 from the chamber 17 and open the passage 19 to such chamber when the parts are in the position as shown in Fig. 2. The valve 30 is slotted as at 31 between the wings 31 so that the same will fit astride the reduced portion 27 of the stem 20 and yet permit the passage of pressure fluid at each side of the Wings 31 to the upper end of the chamber 17. Two pins 34 which are adjustably mounted in one side of the casing project in the chamber 17 and into the slot 31, so that the valve 30 is permitted a vertical, but prevented from any rotary movement.

In the upper end of the casing or cvlinder 23 is provided a chamber 35 in which is mounted for reciprocation, a piston 36 connected to and carried bv the stein 20, a plug 37 being threaded into the upper'end of the casing 23 and provided with a port 38 which is in communication through the pipe 39 and port 40 with the outlet of the channel 4 of the main casing. Pressure fluid is directed into the upper end of thechamber 35 to depress the piston 36 to cause the valve 30 to assume the position as shown in Fig. 2, at which time. the pressure fluid from the channel 2 is directed through the port 16 and the chamber 17 into the passage 19 above the piston 13, such action depressing the piston 13 and causing the valve 5 to seat over and close the port This action takes place when the mechanism to which the pressure is supplied from the channel 4 is at rest and therefore there is an accumulation of pressure in such channel 4. As soon as this condition is relieved, however, the piston 36 is elevated to seat against the apertured seat 4P carried by the plug 38. Thecasing 23 has; a by pass 41 extending downwardly from the plug 37 alimited distance. I Thus, when the piston 36 is raised, the lower face thereof passes slightly above the lower end of the bv-pass 41, and this allows the pressure fluid to pass below the piston 36 to normally prevent the operation thereof, but should the pressure be increased by the sudden accumulation of the pressure in the channel 4, the piston 36 will be forced downa dlv by the pressureof the fluid flo ing throughsthepert 8/8. againstthe pistes rectly. The by-pass 41 thus renders the piston 36 less sensitive during ordinary condipanding will return the piston 36 to normal position. If the device is in an inverted position from that shown-in Figs. 1 and 2, the piston 36 and valve 30 will gravitate to normal position, although this can be accom plished by means of a spring or in various other manners, which need not be illustrated or described in detail, a spring means, however, being illustrated in Fig. 4.

Inthe structure shownin Fig. 4, the casing 23 which-corresponds to the casing 23,=-

carries the stem 20' which inturn carries .the slide valve 30, a longitudinal chamber 42 being provided in which is disposed aspring 43 whose lower terminal abuts-the] shouldered portion 44 and whose upper :ter-

minal abuts the under side of the piston :36". As soon as the pressure is relieved from i above the piston, the spring will thus cause the valve 30" to assume the position, as shown in Fig. 1, the'plug 37 38 being provided in this case to permit the direction of the pressure fluid above the piston 36. The packing glands 21 and the spring 25 are employed as well as the disk 26, all of which correspond to the numerals 1 not primed in Figs. 1 and 2.

From the foregoing description taken in connection with the drawings, it is evident with a valve constructed according to the with its port present invention, that the pressure fluid will be economized when the mechanism operated by the pressurefluid-and passing" through the channels 2 and 4 is drifting, V

and that the same will be automatically cut off from the channel 4 and held in such condition until the pressure at the opposite side of the valve 5 is reduced.-

In general practice, when an engine is. drifting, there is a vacuum created in the cylinder and consequentlyythe piston heats and pounds, it being-necessary to relieve this. by opening the throttle. With the present device, it is necessary to :use the throttle, as steam at low pressure is admitted to-the cylinder to relieve the vacuum when the valve 5 is held slightly unseated by the pin 7, such amount being insuflicient to move the piston after the engine has come. to a halt.

What is claimed is i 7 In a. device of the character described e haviuginlet andeutletpresmreflmd iso channels, a. port between them, a cylinder, a chamber, a port establishing communication between one end of said chamber and the inlet channel, an exhaust port communicating with said chamber, and a passage establishing communication between said chamber and said cylinder, a piston working in said cylinder and having a valve controlling the first mentioned port, a plug closing the cylinder, a member having a plug at one end engaged Within the other end of said chamber and having a chamber therein, a piston Working within the second mentioned chamber, a stem attached to the second mentioned piston and sliding through said member and projecting into the first mentioned chamber, an apertured plug closing the second men- Gopies of this patent may he obtained for tioned chamber, a pipe connecting the third mentioned plug and outlet channel, and a slide valve connected to said stem and slidable within the first mentioned chamber, said slide valve having a by-pass to establish communication between the exhaust port' and said passage, and said member having a groove extending plug past the second mentioned piston when it is adjacent said plug.

In testimony that I claim the foregoing as my own, I have hereto afiixed my signature in the presence of two Witnesses.

ARTEMUS E. HODGDON.

Witnesses:

MARGARET M. VENIL, JEROME OHARA.

five cents each, by addressing the Commissioner 0! Patenta, Washington, D. G.

from the third mentioned-

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