US439586A - crawford - Google Patents

Description

2 Sheets Sheet 1.

J. CRAWFORD.

(No Model.)

GAS REGULATOR.

No. 439,586. Patented Oct. 28, 1890.

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INVENTOR WITNESSES:

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(No Model.)

J. CRAWFORD.

GAS REGULATOR.

WITNESSES:

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2 Sheets-Sheet 2.

Patented'Oct. 28, 1890.

I INVENTOH UNITED STATES PATENT OFFICE.

JOHN CRAWFORD, OF NEW YORK, N. Y., ASSIGNOR TO \V. G. DUFFIELD AND HENRY A. WVEEKS, BOTH OF SAME PLACE.

GAS-REG U LATOR.

SPECIFICATION forming part of Letters Patent No. 439,586, dated October 28, 1890.

Application filed April 11, 1890. Serial No. 347,565. (No model.)

To all whom it may concern: I

Be it known that I, JOHN CRAWFORD, a citizen of the United States, residing in the city, county, and State of New York, have invented certain new and useful Improvements in Gas- Regulators, fully set forth in the following description, and represented in the accompanying drawings.

This invention relates to that class of gasxo governors in which a movable diaphragm of cup shape isseated within a chamber holding a sealing-fluid, (such as 111ercnry,) the movement of the diaphragm under the influence of the pressure of gas determining the quantity of gas permitted to flow through an opening that is controlled by a valve movable with the diaphragm.

The object of the present invention, among other things, is to produce a governor of this 1 2c class that will respond quickly to any change in the pressure of the gas passing through the governor and to distribute the pressure evenly upon the diaphragm, so that it and the controlling-valve will have a proper movement.

To this end the invention consists in providing a supplemental valve to control the gas acting upon one of the diaphragms, and in the novel structure and combination of parts hereinafter fully set forth. I

In the accompanying drawings, Figure 1 is a sectional elevation of a governor provided with the invention. Fig. 2 is a horizontal section taken on the line 2 2 of Fig. 1. Fig.

3 5 3 is a sectional elevation of a slightly-modified form.

Referring to the drawings, it is to be understood that the governor consists of an ex terior cylindrical casing A, forming a diaphragm-chamber B and a gas chamber 0, the one separated from the other by a horizontal partition D. The diaphragm-chamber B contains a cup-shaped diaphragm II, and the chamber is closed by a cover E, that is secured to the top of the casing A tightly, so as to prevent the escape of the sealing-fluid.

Within the diaphragm-chamber B there is provided an annular chamber F, formed by two concentric vertical walls 20 21, secured to the horizontal partition D, that are pro vided with a'removable covering-plate 22, that is perforated, as shown. The chamber F is in communicatibn with the gas-chamber O by a pipe 23, the upper end of which has a T-coupling 24. to direct the gas horizontally within the chamber F and thus afford a more even distribution thereof in said chamber. In order to still further aid the even passage of the gas from the chamber F, the perforations in the top plate 22 will as they near the inlet-pipe 23 be decreased in number, While that portion farthest removed from the said inlet-pipe will be provided with a greater number of perforations.

Within the inner wall of the annular chamher F there is provided another chamber G, also extending within the diaphragm-chamber B, located substantially in a central position therein and in communication through a central opening 25 with the gas-chamber G.

The diaphragm H is carried by a cen trallyarranged and vertical spindle 26, that carries at its. lower end a valve 27, adapted to control an opening 28in apartition 29, dividing the gas-chamber into two, forming at one side of said partition the inlet-chamber and at the other side of the partition the outletchamber. The vertical spindle 26 is properly guided and steadied in its vertical move ments with the diaphragm by a bracket 36, through which the lower end of the spindle passes, and a spider-bearing 30, formed at the top of a cap 31, seated within and secured to the central chamber G. The vertical wall of the diaphragm II extends down into the space between the exterior casing A and the annular chamber F, as shown in Fig. 1. There is provided an auxiliary diaphragm I, considerably less in size than the diaphragm II, that is also carried by the vertical stem 0 26 within the larger diaphragm, so that its vertical walls extend down into the space between the annular chamber F and the central chamber G, as shown in Fig. 1.

In order to obtain a more steady action of 5 the diaphragms, the gas-passage to one of them is controlled by a supplemental valve, which valve, as the controlling-valve proper moves toward its seat, also moves to restrict the gas-passage to said diaphragm, thus decreasing the amount of gas passing thereto, while the gas under the diminished pressure is acting as before upon the other diaphragm. Thus the cap 31, secured to the chamber G by the screw-threads shown, carries upon its lower end a seat 32 for a supplemental valve carried by the vertical stem 26. The diaphragms are each preferably made of sheetiron, with a surface of enamel to prevent oxidation.

The diaphragm-chamber is supplied with a quantity of mercury, so as to more or less fill the space between the walls of the chambers and between the walls of the annular chamber of the exterior casing, and in order to allow the mercury to pass into the space be tween the annular chamber and the central chamber G there is provided a communicating passage 34.

The upper end of the vertical spindle 26 may extend slightly above the top of the diaphragm ll, so that one or more weights may be placed around the spindle upon the diaphragm to regulate the pressure at which the diaphragms will respond to the gas-pressu re to control the opening 28.

The cover E will be provided with a somewhat enlarged central opening, that is closed by a removable screw-threaded cap 35, by which access may be had to the top of the diaphragm for the purpose or adjusting the weights thereon and the cap has a small airinlet 37 for a well-known purpose.

In the operation of the governor the construction is such that the incoming gas will pass in the direction of the arrows into the inlet portion of the gas-chamber 0, through the opening 28 of the partition 29, and into the outlet portion of the gas-chamber, and thence onward. A portion of theineoming gas will pass through the opening 25 into the chamber G, and thence past the valve 33 and its seat into the space confined by the auxiliary diaphragm I. This diaphragm is of considerably less area than the main diaphragm H, so that only comparatively a small volume of gas will pass therein and act upon the dia phragm. If the pressure of the incoming gas upon the diaphragm I exceeds the weight of the diaphragms and the valves and the weights that may be upon the end of the stem, both diaphragms will be raised sufficiently to have caused the valve 27 to have restricted the opening 28, so as to allow only a proper flow of gas therefrom. At the same time the other valve 33 will also have been raised, so as to approach its seat 32, and thus more or less cut off the quantity of gas acting upon the auxiliary diaphragm I, while the gas under diminished pressure continues to act upon the main diaphragm. Owing to the restricted size of the auxiliary diaphragm, it will beapparent that the diaphragm will immediately respond to any variation in the pressure of gas, so as to vary the size of the opening 28 upon the least variation in pressure. If the gas-pressure raises, it will have immediate effect upon the supplemental valve, and will aid in immediately moving the controllingvalve nearer its seat. The gas from the outlet portion of the gas-chamber will pass by the pipe 23 into the annular chamber F, and through the perforations in its top platepass to the under side of the diaphragm ll and act upon it. The pressure of the gas will by the action of the controlling-valve 27 be much less than in the inlet portion of the chamber, and the volume necessary to fill said annular chamber and below the diaphragm II will much exceed that necessary to [ill the central chamber G and below the diaphragm I, so that the pressure of the gas from the outlet portion of the gas-chamber will have exerted its pressure upon the diaphragm ll, aidin g that upon the smaller diaphragm, tending to control the movement of the controllingvalve 27. As soon as any use of gas is stopped the pressure in the outlet-chamber will be increased, so that it will immediately etfect the main diaphragm and cause it to move the controlling-valve.

The inlet portion of the gas-chamber C is preferably provided with two connecting-nozzles 1O 11, arranged at right angles to one another, so that the governor maybe attached to a supply-pipe extending either horizontally or vertically. Of course when the supplypipe is connected to one of the nozzles the other nozzle, as ll, will be stopped by a plug 12.

In the structure shown in Fig. 3 the construction and arrangement of the chambers F G and the diaphragms II I are substantially the same. The gas-chan'iber, however, is modified in form, and is provided with a horizontal partition 129, having the usual opening 28, as in the other structure. The gas enters the chamber below the partition 129 and passes through the opening 28, and it passes from the chamber above that partition through the nozzles and in the directions of the arrows shown.

Instead of allowing the gas under its original or main pressure to act directly upon one of the diaphragms, as the auxiliary one in Figs. 1 and 2, and upon the supplemental valve, both chambers F and G are supplied with the reduced-pressure gas, as will be readily understood. In both constructions, however, the auxiliary diaphragrmbeing of a smaller size than the diaphragm H, and the supplemental valve being employed, will be more readily influenced byany change in the gas-pressure.

No further or detailed description of the operation of the governor is deemed necessary, as .the operation of this class of governor is now well understood. The sealing-liquid such as mercury-quay of course be passed into the diaphragm-chamberB through an opening in the cover E, closed by a screw-cap 15, and may be withdrawn therefrom at the bottom of the diaphragm-chamber through the opening closed by a screw-cap 16. The water of condensation accumulated within IIO the gas-chamber C may be withdrawn through the opening closed by a similar screw-cap 17.

What is claimed is- 1. In a gas-governor, the combination of a gas-chamber, a controlling-valve therein, a diaphragm-chamber, a main and auxiliary diaphragm arranged in the diaphragm-chamher and connected with said valve, a communicating passage between the gaschamber and the interior of each of the diaphragrns, a supplemental valve controllingthe passage to the auxiliary diaphragm, and a sealingliquid, substantially as described.

2. In a gas-governor, the combination of a gas -chamber, a controlling valve therein, a diaphragm-chamber, two separate chambers extending into the diaphragm-chamber and each in communication with the gaschamber, a diaphragm surrounding each chamber and connected with said valve, a supplemental valve controlling the passage to one of the diaphragms, and a sealing-liquid, substantially as described.

3. In a gas-governor, the combination of a gas-chamber having a partition and an opening therein controlled by a valve, a diaph ragm-chamber, a chamber extending within the diaphragm-chamber and having a perforated top, a communicating pipe between the gas-chamber and the chamber within the diaphragm-chamber, having at its end a T- shaped passage to direct the incoming gas horizontally within the chamber, a diaphragm surrounding the chamber within the diaphragm chamber and connected with the valve, and a sealing-liquid, substantially as described.

4. In a gas-governor, the combination of a gas-chamber divided by a partition having an opening controlled by a valve, a diaphragmchamber, two diaphragms arranged therein and both connected to said valve, two separate passages leading from the gas-chamber to the under side of the diaphragms, one passage from the inlet side of said partition and the other on the outlet side of the partition, a supplemental valve controlling one of said passages, and a sealing-liquid, substantially as described.

5. The combination of a gas-chamber, a diaphragm-chamber, two diaphragms within the diaphragm-chamber, a stem connected with the diaphragms and with two valves, one controlling the passage of gas through the gaschamber and the other the passage of gas to the under side of one of the diaphragms, and a sealing-liquid, substantially as described.

6. The combination of a gas-chamber, a diaphragm-chamber, a central chamber extending into the latter chamber and in communication With the gas-chamber, an open cap removably secured to the top of said central chamber and having a valve-seat at its lower end, a spindle passing through said central chamber having a controlling-valve for the passage of gas through the gas-chamber, a diaphragm carried by said spindle around the central chamber, a supplemental valve also carried by the spindle, adapted to seat against the end of the cap, and a sealing-liquid, substantially as described.

In testimony whereof I have set my hand, this 20th day of March, 1890, in the presence of two witnesses.

JOHN CRAWFORD.

Witnesses:

GEO. H. GRAHAM, NETTIE MARLER.

It is hereby certified that the name of the first-mentioned assignee in Letters Patent No. 439,586, granted October 28, 1890, upon the application of John Crawford, of New York, N..Y., for an improvement in Gas-Regulators, was erroneously written and printed W. G. Duftield that send name should have been written and printed U.

3 G. Duflield; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office. I

Signed, countersigned, and sealed this 25th day of November, A. D. 1890.

[SEAL] CYRUS BUSSEY,

Assistant Secretary of the Interim. Gountersigned C. E. MITCHELL,

Commissioner of Patents.

Correction in Letters Patent No. 439,586.

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