US696471A - Automatic pressure-governor. - Google Patents

Description

No. 698,47I. Patented Apr. I, |902.

J. W. NEIL.

AUTOMATIC PRESSURE GUVERNUR.

(Application filed June 24, 1901.)

(No Model.)

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JOHN W. NEIL, OF CINCINNATI, OIIIO.

AUTOMATIC PRESSURE-GOVERNOR SPECIFICATION forming part of Letters Patent No. 696,471, dated April 1, 1902.

Application iiled June 24, 1901.

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Be it known that I, JOHN W. NEIL, a citizen of the United States of America, and a resident of Cincinnati, in the county of Hamilton and State of Ohio, have invented certain new and useful Improvements in Automatic Pres sure-Governors, ot which the following is a specification.

The object of my invention is a pressureregulator to be placed in the steam-line of an engine which automatically controls the amount of steam passing through it, so as to keep said amount in proportion to the pressure against which the engine is working, so that against variations of pressure below a certain limit the engine will run at a uniform speed and cease to run when that limit is passed. This object is attained by the means described in the annexed specification and illustrated in the accompanying drawing, in which the ligure is a central vertical sectional view of a pressure-regulator embodying my invention in a form used for regulating a pump.

Valve-casing A, which is to be placed in a steam-pipe leading from a boiler into asteampump, has its inlet-opening a upon a higher horizontal plane than its Outletbpening a'. Vithin the upper end of cylinder A, between openings a and a', is a piston-valve B, which consists of a cylinder with closed ends b and b' and longitudinal slots b2 in its sides, extending from the upper end downward, leaving an imperforate portion bat the lower end, which in the uppermost position of the valve registers with and closes the outlet-opening a. Valve B is held in its upper position by a spring b4, pressing upward against b with a pressure which may be regulated by screw b5 in the lower end of casing A.

Upon the upper end of casingA is a cylindrical governing-chamber C, within which is a piston c, whose piston-rod c'extends through the upper head of cylinder A and is secured to end h of valve B. A pipe c2 forms communication between the upper end of governingchamber C and the pressure against which the pump is dischargingmas, for instance, the pressure in a tank (not shown) for hydraulic elevators. The limit of the upper travel of valve B is regulated by ahand-screw c3 in the head of valve-chamber C, against which pis- Serial No. 65.741. (No model.)

ton c abuts when the valve is in its uppermost position. Suppose valve-casing A to be interposed in a pipe conveying steam to a pump and that the pump is working against a normal pressure in a tank wherein the degreeot pressure is subject to change. Steam would enter through opening a, go through slots hginto cylinder B, and out through opening a', and thence to the pump. Now should the pressure in the tank be diminished this diminution of pressure is immediately con veyed to piston c, which allows spring b4 to carry valve B upward, so that imperforate portion b3 of the valve lessens the size of discharge-opening a', and thereby diminishes the supply of steam to the pump in proportion to the diminution of pressure in the tank, so.

that the pump does not run away.77 As the pressure in the tank is raised again the pressure being conveyed to the top of piston c again lowers valve B to admit the desired amount of steamto the pump to run it against the increased pressure.

rIo keep the pressure in the tank below a certain limit, I employ the following means: Within the lower end of cylinder B is a secondary valve D, which consists of a cylinder of a length substantially equal toportion b3, open at its upper end and closed at its lower end d, which has perforations d in it to allow the steam to pass the under side of it, so as to make it a balanced valve. Extending from the lower end d through end h of valve B, through screw hin the lower head of casing A, and into a second governing-chamber E, which is secured to the lowerend of casing A, is a stem d, which terminates Within the chamber E in a piston c. Valve Dis held in its lowerposition within valve B by a spring d3, which surrounds stem d between the end b' of valve B and a collar d4 upon stem cl2, by which the tension ot said spring may be regulated. Entrance into the .lower end of governing-chamber E is controlled bya valve e', which may be Set by means of spring e2, so that it requires a certain pressure to open it. A pipe e3 connects valve e' with the tank into which the pump is discharging. If the pressure in the tank exceed that at which spring e2 is set, the pressure opens valve c', raises piston e and valve D, which contracts openings a/ and diminishes the supply of steam to IOO the pump until the pressure yin the tank falls below the limit, when valve D is returned by spring (Z3 to its normal position to allow the steam to pass,fas usual, to the pump.

Itis of course obvious instead of having slots in the cylindrical valve B between the imperforate lower end and the upper end the intervening metal between said parts might be cut away entirely and the ends connected by a rod or other means, so that the valve remained a balanced valve-that is, that the pressure of steam on the end b were counterbalanced by that upon end h of valve B.

What I claim is* l. In a pressure-governor for controlling fluids under pressure a valve-casing having itsinlet-openinginadiferenthorizontal plane from its outlet-opening, a valve within the case having adjacent to the outlet-opening an im perforate end portion to be carried over the outlet-opening to contract the same and an upper port-ion above the inlet-opening and connected to the imperforate end portion to balance a pressure thereon, a spring to hold the valve in its normal position, and a channel for communicating the pressure to be controlled 'ro the valve to move it when said pressure Varies from that of the spring, substantially as shown and described.

2. In an automatic pressure-governor for engines the combination of a Valve-case having its inlet-opening upon a higher horizontal plane than its outlet-opening, a cylindrical valve within the casing consisting of a lower imperforate end portion adjacent to the outlet-opening an upper disk above the inletopening and connected to the lower portion, a spring bearing upward against the valve, a governing-chamber upon top of the case, a piston within the chamber, a rod connecting the upper end of the valve and the piston and channel for communicating the pressure against which the engine works to the piston, substantially as shown and described.

3. In a pressure-governor the combination of a casing having its inlet-opening upon a higher horizontal plane than its outlet-opening, within the casing a hollow cylindrical valve having closed ends and longitudinal slots in its sides leaving an mperforate p0rtion at its lower end adjacent the outlet-opening, a spring bearing upward against the valve, a second balanced valve within the lower end of said valve, a governing-chamber upon the upper and upon the lower ends of the casing, pistons within the chambers, a rod connecting the upper piston with the first valve a second rod connecting the lower piston with the second valve, a valve controlling the entrance to the lower governing-chamber which is to be opened only by a pressure exceeding a certain limit, and means for communicating the pressure of discharge to the piston within the upper governing-chamber and to the valve controlling the entrance to the lower governing-chamber, substantially as shown and described.

JOHN W. NEIL.

W'itnesse's:

W. F. MURRAY, EMMA LYFORD.

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