Untitled record

^iNoMode1·’ c. E, BROWN.

VALVE.

No. 587,786. Patented Aug. 10, 1897.

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THE NORRIS PETERS CO. PHOTO-LITHO.. WASHINGTON. 0. C.

United States Patent Office.

CHARLES E. BROWN, OF ROME, NEW YORK.

VALVE.

SPECIFICATION forming part of Letters Patent No. 587,786, dated August 10, 1897.

Application filM March 11, 1897, Serial No. 627,056. (No model.)

To all whom it may concern:

Be it known that I, Charles E. Brown, a citizen of the United States, residing at Rome, in the county of Oneida and State of New 5 York, have invented certain new and useful Improvements in Valves; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it apio pertains to make and use the same.

My invention relates to that class of throttle-valves adapted to be instantly closed in case of accident to the machinery or other causes, and from various points in the sys15 tem, either mechanically or electrically; and my invention consists, first, in the combination, in a stop or shut-off valve, of a valve seated against the pressure, a stem connecting said valve to a piston of greater area, an 20 opening or by-pass around or through , said piston, and a vent pipe or valve the area of which exceeds the area of the by-pass, whereby the opening of the vent will remove-the pressure from one side of the piston and cause 25 the main valve to be closed by the pressure on the piston at a speed proportionate to the area of by-pass and vent-pipe, and to certain other novel features, all as hereinafter described.

In the accompanying drawings, Figure 1 is a sectional view of a valve with my improvements applied, showing the valve provided with wings or guides and with the valve opened and with one means of operating the 35 valve electrically. Fig. 2 is a similar view showing another form of valve and with the valve closed, in both of which constructions an ordinary hand-wheel and screw being shown for f ully or partially closing the valve.

Fig. 3 is a sectional view showing the valve without a hand-wheel, adapted to be used as auxiliary to an ordinary hand-operated valve, also shown in said figure.

The casing A, except in the particulars 45 hereinafter stated, is of the ordinary globe form, having the inlet B and outlet C. The casing has connected thereto and preferably formed integral therewith a cylindrical portion D, having a suitable cap or cover D', se50 cured by the usual form of flanges and bolts. The valve-seat E is formed in the diaphragm

E', and is of the usual or anj^T desired construction.

Mounted on a stem F is a valve G, constructed as shown either in Figs. 1, 2, and 55 3, or otherwise, as shall be found most desirable, to be seated against the pressures, and upon the other end of this stem is mounted a piston H to fit the cylindrical portion D. The piston is provided with a small by-pass. 60 h, hereinafter referred to. A pipe D² is connected to the cap or cover D', and which pipe is provided with a vent-cock D^s, the area of outlet exceeding the area of the by-pass, for a purpose hereinafter explained. 65

Where the device is used as an auxiliary or supplement to an ordinary throttle-valve and its action controlled entirely by the action of the steam to open and close the same, the stem extends up beyond the valve and 70 engages a suitable guideway D⁴ in the casing, or the arms II may be made to serve as guides, as shall be found most desirable.

When the device is used with a hand-wheel for wholly or partially closing the valve or re- 75 leasing the same, a screw-threaded stem I is employed, passing through a suitable stuffingbox, with the lower end of the stem provided with a suitable socket or recess to receive a pin I', or a projecting portion of the valve- 80 stem passing through the valve, and the upper end of the screw-threaded stem is provided with a hand-wheel I² of any usual or desired construction.

By the construction and arrangement of 85. parts it will be seen that as steam is admitted, the vent-cock D^s being closed, the valve will be raised and the steam will pass through the by-pass and under the piston and establish an equilibrium, allowing the free passage 90 of steam, or the valve acting against the pressure of the steam is opened thereby, and an equal pressure being exerted on both sides of the piston said piston perforins no function; but should a break occur in the ma- 95 chinery or from any cause it should become desirable to out off the steam instantly by opening the vent-pipe,which is of larger area than the by-pass, the pressure will come on the side of the piston adjacent to the valve, 100 and as said piston is of larger area than the main valve and the pressure is against both

587,786 piston and valve the greater area will overcome the lesser and the piston will pull the valve against the seat closed, and upon again closing the cock of the vent the equilibrium 5 will be restored and the valve again open to action of the steam.

The pipe D³ may extend to different points in the system and be provided with a series of vent-cocks, the opening of any one of which io will cause the same action. A wire may also be employed connected to the vent-cock and extend to different points, and by pulling on the same open the vent, or the same may be controlled electrically by a pair of electro15 magnets or helices, with the armature connected to the cock of the vent and a series of split circuits and push-buttons located at various points in the system.

A whistle or other signaling device may be 20 connected with the valve, so that when the vent-cock is actuated to cut off the steamsupply an alarm will be sounded.

Various modifications in the means of controlling the vent-cock or the means of open25 ing or closing the main valve by hand may be made, as will be readily understood.