US41580A - Improved safety-valve arrangement - Google Patents

Description

p V UNITED STATES PATENT OFFICE.

wiLLrAt/r s. HUNTINGTON, on` ANDEUsvILLE, NEW vonk, AssIGNon To HIMSELF AND JAMES RUBERTSON, OF ALEXANDRIA, VIRGINIA.

i IMPROVED sAFETYvALVE ARRANGEMENT.

Specification forming part of Letters Patent No. 411,580, 'dated February 9, 186i;v

To all whom it may concern:

Be it known that I, W1LLIAMS.HUNT1NG TON, of Andrusville, in the county of Franklin and State of New York, have invented a new and Improved Safety-Valve Regulator for Steam-Boilers; and I do hereby declare the following to be a full and exact description of the same, reference being had to the accompanying drawings, making part of this specification, in whichn Figure l is a side elevation of a steam-boiler and dome with my invention applied. Fig. 2 is a sectional elevation of the same, the section being taken in the line x, Fig. 3. Fig.

3is a section in the line y y, Fig. 1, looking from above. Fig. 4 is an end elevation.

Similar letters of reference-indicate corresponding parts in the several views. y

The object. of this invention is to produce a valve and devices'for automatically operating the same to be employed in connection with or in addition to the ordinary safety-valve, and designed to preclude the possibility of explosion in cases where steam is being blown oft' at the primary valve, but where the port of the latter is of too limited dimensions to permit the escape of steam in sufficient quan tity, or with the expedition which the excessive pressure or surplus thereof demands.

In order that others skilled in the art to which my invention appertains may be enabled to fully understand'and use the same,

' I will proceed to describe its construction and operation.

In the accompanying drawings, A may represent a boiler, and B a steam-dome mounted thereon, The steam-pipe within the dome may be closed by a valve of any suitable construction, which valve is attached to the end of the lever C in customary manner, the said lever C being at its opposite end connected to the spring balance or gage D.

E is a rod pivoted at its respective ends to the lower end of the steam-gage D, and to the upper end of a sliding rack, F, which moves vertically in ways G, secured within a circular guide, H.

I represents a oogged segment formed upon or rigidly affixed to the end of a lever, I', and pivoted at or near its junction with the lever I in theA horizontal bars I2, which latter may be formed with or secured in the: guide H.

The segment I is `secured in such position that its teeth work within the teeth ot the rack F, so that by the turning ot' the lever I the position of said rack maybe varied in height for the purpose to be explained.

J represents a screw or pin secured in the lever I at a point slightly above the guide H, and forming a support and pivot for a catch or pawl, K, which is adapted to bc retained in either of a series of notches, h, in the guide H, by a spiral spring, It, encircling the screw J.

L represents arod, jointed at its upper end to a lug, c, formed upon and depending from the lever O, and at its lower end to a bent arm, M, which, when the rod L is elevated by asimilar movement of the valve-rod C, is adapted to partially rotate a cam, N, so as to throw the spring catch or pawl K out of the uppermost notch in the guide H for the purpose of permitting the valve covering the steam'pipe Within the dome B to be elevated,

as will be explained. The shaft n, upon which the cam N is keyed, has its bearings in a lug, a', and a suitable box, N.

Operation: It will, ot' course, be understood that the valve upon the lever C is to be held within its seat by power more or less in excess of that applied to the prim ary valve-that is to say, that a somewhat higher pressure of steam will be required to elevate the valve upon the lever O from its seat than to open the port of the primary valve. The parts being in the position shown in Fig. l, it will be supposed that the primary valve has been opened by a high pressure of steam. If, when the primary valve is in its open condition, the volume of steam within the -boiler suddenly increases to such an extent that the dimensions of said primary valve are too limited to admit ofthe escape of steam through the same in quantity or rapidity commensurate with such sudden increase in volume, the steam contained in the pipe within the dome B acts upon the valve'on the Vlever O, and exerts a pressure thereon until the weight at which the gage D may be set is overbalance. The valve is then at once opened and the steam discharges itself in a volume ot ample size to preclude the possibility of explosion. The gage is so arranged that when the index thereof has reached the point at which the valve should be allowed to open the bent arm M is by the rod L caused to act upon the cani N, in order to throw the pawl K out of the uppermost notch in the guide H, whereupon the lever I', being released, adapts the cogged segment I to be freely turned upon the pivot in the bars l2, so that the rack F will be therebv :released and the lever G allowed to ascend. l

lt will be apparent that the valve upon the' lever G may be readily restored to its closed position by turning the lever I till the pawl K, again takes into the uppermost notch in the guide H. By adjusting the pawl K in either otl the remaining notches h the pressure required to elevate the valve on the lever C may be lessened as circumstances may render needful. Having thus described lnyv invention, the

following is what I claim as new therein and

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