US760488A

US760488A - Valve.

Info

Publication number: US760488A
Authority: US
Inventors: Harry C Root
Original assignee: Individual
Current assignee: Individual
Priority date: 1904-03-19
Filing date: 1904-03-19
Publication date: 1904-05-24
Anticipated expiration: 1921-05-24

Description

No. 760,488. PATENTED MAY 24, 1904. H. G. ROOT.

VALVE.

APPLICATION FILED MAR. 19, 1904. NO MODEL.

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.THE NORRIS PETERS co. wasmuamu, u c

fatented May 24, 1904.

PATENT OFFICE.

HARRY-C. ROOT, GI CHARLESTON, ILLINOIS.

.vALVE.

SPECIFICATION forming part of Letters Patent No. 760,488, dated May 24, 1904.

Application mantra 19, 1904.

To all whom it may concern:

Be it known that I, HARRY O. Roo'r, a citizen of the United States, residing at Charleston, in the county of Coles and State of Illinois, have invented certain new and useful Improvements in Valves, of which the following is a specification.

The object of myinvention is to produce apressure reducing and controlling valve which shall in operation be doubly balanced, the ar* rangement being such that the pressure-controlling means shall be normally out of action when the desired pressure is maintained.

The accompanying drawing, which is a cen-, tral vertical section, shows the parts in the positions' occupied when the parts are in normal operating position.

In the drawing, 10 indicates a suitable casing, having a cylinder 11 formed in one end and a secondary-pressure chamber 12 formed ,in the other end. Leading into the upper end of cylinder 11 is a main supply-port 13, with which communicates the main supply-pipe 14. Leading from cylinder 11 at a point slightly below the port 13 is a port 15, which through a by-pass 16 leads into chamber 12. Leading from chamber 12 is the main eduction-pipe 17 The upper end of casing 10 is closedby a head 18, which is provided with an adjustable spring-abutment 19, against which one endof the pressure-controlling spring 20 abuts. The lower end of casing 10 is closed by a head 21, provided with a suitable packing-gland, through which the piston-rod 22 extends. Below head 21 is arranged a-cylinder 23, the lower end of which is closed, and leading into this end is a port 24, which also communicates with the main supply-pipe 14. The piston-rod 22 carries at its upper end a piston 25, which fits cylinder 11 and is adapted to be brought opposite port 15 to close the same. Secured to the lower end of piston rod 22 is a piston 26, which at all times lies 1 above port 24.

Serial No. 198,898. (Nn'modoh) to the square inch to balance the same, and

as pressure is admitted through pipes 14 it will pass simultaneously through the

ports

13 and 24 into the upper end of cylinder 11 and the lower end of cylinder 23, whereupon structure 22 25 26 becomes balanced. Thefiuid also passes through port 15 and by-pass16 into chamber 12 and from thence out the eduction-pipe 17. As soon as there is any pressure in chamber- 12 this pressure acts upon the lower side of piston-head 25, thus raising the piston structure and bringing into action the spring 20. As soon as the .pressure within chamber 12 becomes equal to the strength of the spring the port 15 will have been closed a sufiicient amount to preventaccumulation of more than the desired amount of pressure in the chamber 12. The valve structure is therefore at all times substantially balanced, the initial pressure through the pipe 14 acting equally upon the top and bottom of the piston structure,whilethe spring 20 and the weight of the piston structure is balanced by the reduced pressure in chamber 12. As a consequence the spring 20 does not control the reduced pressure by continuous opposition against the initial pressure, but remains but little uncompressed during normal operation, becoming materially compressed only'when the pressure momentarily increases in the chamber12 beyond the desired maximum, so that there is not the continuous possibility of the breaking of the spring, asis the case in reducing-valvesof the spring type now commonly in use. It will also be noticed that the port 15 is always in direct communication with the induction-port 13.

It will be readily understood that my device may be used in any place where a reduced pressure is desired-as, for instance, in steam plants, natural-gas mains, in water-mains, as

a pressure-controlling valve for airbrakes, mines, and other air plants, and many other places too numerous to mention.

If at any time the initial pressure falls'be; low the maximum desired, the entire initial pressure will pass through the valve unhindered, for the reason that under such circumstances the piston drops to its lowest point and the spring plays no part at all in the op (nation, and it also will be noticed that any sudden rise in the initial pressure will not throw any extra stress on the spring nor affect. the secondary pressure in the least.

I claim as my invention 1. Ina pressure-controlling valve, the com bination,- with a suitable casing'having a pair of initial-pressurc chambers and a secondarypressure chamber formed therein, inductionports leading into each of the initial-pressure chambers and a by-pass leading from one of said initial-pressure chambers to the secondary pressure chamber, of a valve structure arranged in said casing and adapted to control the eflf'ective area of the by-pass, said valve structure being so arranged as to be'engaged in opposite directions by the initial pressure and by thesecondary pressure in the secondarywpressure chamber in opposition to the di-' rection of pressure upon the valve structure in one of the initial-pressure chambers, andasecondarypressure -determining device arranged to engage the valve structure in opposition to the pressure in the secondary-pres-' sure chamber. 2. A pressure-controlling valve structure consisting of, a casing having a pair of initialpressure chambers, a secondary-pressure chamber, an induction-port leading into each of the initial-pressure chambers, a by-pass leading from one of said initial-pressure chambers to the secondary-pressure chambers, and an eduction-pipe leading from the secondarypressure chamber, of a piston structure having a pair of heads one mounted in each initial-pressure chamber and adapted to be engaged by the initial pressure in opposite directions, one of said pistons being adapted to control the effective area of the by-pass and one'of said pistons having one end arranged-in the secondary-pressure chamber, and a secondary-pressure-controlling spring arranged to engage the piston structure in opposition to the pressure exertediuponthe piston structure from the secondary-pressure chamber.

3. A pressure-controlling valve structure consisting of, a casing having a pair of initialpressure chambers, a secondary pressure chamber, an induction-port leading into each of the initial-pressure chambers, a by-pass leadv ing from one of said initial-pressure chambers to the secondary-pressure chambers, and an eduction-pipe leading from the secondarypressure chamber, of a piston structure having a pair of heads one mounted in each initial-pressure chamber and adapted to be engaged by the initial pressure in opposite directions, one of said pistons being adapted to control the eflective area of the by-pass and one of said pistons having one end arranged in the secondary: pressure chamber, a secondary-pressure-controlling-spring arranged to engage the piston structure in oppositionto the pressure exerted upon the piston structure fromthesecondarypressure chamber, and means for adjusting the effective pressure of said spring.

4. A pressure-reducing valve consisting of,

a pair of initial-pressure cylinders each having an induction-port, a' piston structure consisting of a pair of separated heads one arranged in'each of said initial-pressure cylinders, a secondary-pressure chamber arranged adjacent and communicating with one of said piston-heads in opposition to its initial-pressure cylinder and having a bypassleading a pair of initial-pressure cylinders each hav-- ing an induction-port, a piston structure consisting of a pair of separated heads one a1" ranged in each of said initial-pressure cylinders, a secondary-pressure chamber arranged adjacent andcommunicating with one of said piston-heads in opposition to its initial-pressure cylinder and having a bypass-leading around said piston and communicating with the opposed initial-pressure'cylinder, said pistons being arranged to control the effective area of the by-pass, and a spring arranged in said last-mentioned initial-pressure cylinder to engage the piston structure .in opposition to the pressure exerted thereon fromthe secondary-pressure chamber. I

6. A pressure-reducing valve consisting of, a pair of initial-pressure cylinders each having an induction-port, a piston structure consisting of a pair of separated heads zone arranged in each of said initial-pressure'cylinders, a secondary-pressure chamber arranged adjacent and communicating with one of said piston-heads in opposition toits initial-pressure cylinder and havinga by-pass leading around said piston and communicating with the opposed hiitial-pressurecylinder, said pistons being arranged to control theeffectivearea of the by-pass, a spring arranged in said last-mentioned initial-pressure cylinder to engage the piston'structure in opposition to the.

pressure exerted thereon from the secondarypressure chamber, and means for, adjusting the effective force of said spring.

In witness whereof I have hereunto set my hand and seal, at Charleston, Illinois, this 15th day of March, A. D. 1904.

HARRY (J. ROOT. [1,. s.] Witnesses:

J. B. Rosennnuon, GEo. H. DAVIS.