US745002A - Safety-valve. - Google Patents

Description

No. 745,002. PATENTED NOV. 24, 1903.

LE ROY DEVERS 6:0. E. DUNN.

SAFETY VALVE.

APPLICATION FILED MAR. 21. 1903.

N0 MODEL.

Fig.1

INVENTOHS.

ATTORNEY Patented November 24, 1905.

UNITED STATES PATENT Crricn.

LE ROY DEVERS AND CLARENCE E. DUNN, OF DAYTON, ()lIIO.

SAFETY-VA LVE.

SEEGIFICATIOH forming part of Letters Patent No. 745,002, dated November 24, 1903.

Application filed March 21, 1903. Serial No. 148,947. (No model.)

To ctZZ whom, it may concern:

Be it known that We, LE ROY DEVERs and CLARENCE E. DUNN, citizens of the United States, residing at Dayton, in the county of Montgomery and State of Ohio, have invented certain new and useful Improvements in Safety-Valves; and we do 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 appertains to make and use the same, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form a part of this specification.

This invention comprises a safety-valve or cut-oif for natural and artificial gases and possesses the new and useful features hereinafter described and claimed.

The object of the invention is to provide a cut-off or safety device which is absolutely and at all times reliable in its operation.

Preceding a detail description of the invention reference is made to the accompanying drawings, of which- Figure 1 is an elevation of our improved safety-valve. Fig. 2 is a vertical section.

In a detail description of the invention similar reference characters indicate corresponding parts.

A designates a union of special construction, the ends of which are tapped to receive distributing-pipes A. The said union has a channel B through its longitudinal center, which communicates with the distributingpipes and which is intersected by a conicalshaped valve'seat D, that extends entirely through the body of the union. The upper portion of the said union terminates in a suitable offset 0, through which the said valveseat extends and the upper surface of which is flat in order to properly receive the lower edge of a diaphragm G around the valve-seat. The said diaphragm consists of a series of bellows folds which inflate and collapse according to the pressure of the gas exerted on the interior thereof. The lower end of this diaphragm is secured to the upper fiat surface of the oifset C by means of a suitable washer H, so that the lower extreme end of said folding diaphragm is immovable. The

. upper end of said folding diaphragm is continuous, as at J, and is secured to the under side of a disk I, which moves freely within the casing L, said casing being properly secured to the circumference of the oifset C and having a cap M.

E designates an elongated valve which fits in the seat I) and has its stem F projected upwardly through the center of the folding diaphragm and made secure at its upper end to the disk I by means of a nut K or otherwise. It will be seen that this valve E is of a very slight taper from a vertical line. This is an important feature, for the reason that when the valve is in its seat there will be no possibility of the pressure raising it until after the initial lift has been given it by the set screw N. The folding diaphragm G, it will therefore be seen, raises the valve E from its seat across the channel B when the flow of gas through the distributing-pipes is normal. At such times the interior of the folding diaphragm is filled with the necessary pressure to maintain the valve from its seat, as shown in Fig. 2. The lower extreme end of the valveseat D is adapted to receive a liftingscrew N, by means of which the valve is suf ficiently raised from its seat to permit of the gas-pressure lifting said valve at such times when the pressure of gas rises to its normal state. In other words, should the pressure of gas suddenly give out or diminish the weight of the valve will cause said valve to drop into the seat with the end thereof in suitable proximity to the end of the liftingscrew N. \Vhen the valve is in this position, it is manifest that the channel or passage B will be closed and the gas thus prevented from entering the interior of the folding diaphragm, as well as prevented from passing through the distributing-pipes. When it is desired to sufliciently raise the valve to permit of this normal pressure of the gas having its proper effect to open said valve, the lifting-screw N is turned sufficiently to dislodge the valve E from its seat, and thereby permit a sufficient opening for the gas to enter the interior of the folding diaphragm.

Having described our invention,we claim- 1. In a safety-valve, a union having a gaspassage extending through its longitudinal center, said union having an offset on its upper side through which extends a conicalshaped valve-seat, said valve-seat receiving at its lower end a lifting-screw, an elongated valve adapted to properly fit said valve-seat and to lie in proximity to said screw when said valve is seated, a folding diaphragm having one end secured to the upper side of said offset, the upper end of said diaphragm being secured to a disk which is freely movable under the expanding and contracting movements of the folding diaphragm, the stem of the valve being connected to said disk so that the folding diaphragm is movable according to the pressure of the gas exerted on the interior thereof, and the valve is controlled and thereby maintained from its seat or permitted to seat, substantially asset forth.

2. In a safety-valve, a union having a longitudinal gaschannel through its center which is intersected by a Valve-seat, said union having an offset on its upper side LE ROY DEVERS. CLARENCE E. DUNN.

VViinesses:

R. J. MCCARTY, H. H. HABERER.

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