US326904A - Safety-valve - Google Patents

Description

(NoModeL) i W. E. GRANGER.

SAFETY VALVE. No. 326,904. Patented Sept. 22, 1885.

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XVILLIAM E. GRANGER, OF SPRINGFIELD, MASSACHUSETTS.

SAFETY-VALVE.

SPECIFICATION forming part of Letters Patent No. 326,904,.dilted September 22, 1885.

Application filed May 18, 1885. (No model.)

To all whmn it may concern:

Be it known that I, WM. E. GRANGER, a citizen of the United States, residing at Springfield, in the county of Hampden and State of Massachusetts, have invented new and useful Improvements in Steam Safety-Valves, of which the following is a specification.

This invention relates to improvements in steam safety-valves, the object being to provide improved attachments for certain classes of said valves, whereby when the parts which hold the valve against the steam-pressure become accidentally broken and the valve is blown out, the aperture through which the steam escapes closes automatically, thereby, in the case of a locomotive upset by an accident, preventing the escape of steam and hot water therefrom by which persons may be scalded.

In the drawings forming part of this specification, Figure 1 shows a vertical section of aportion of the dome of alocomotive having applied thereto a steam safety-valve embodying my improvements. Fig. 2 is a perspective View of the valve proper of the safetyvalve, and the automatically-acting valve. Fig. 3 is a perspective view of the valve-seat, and of the cage for the said automaticallyclosing valve.

In the drawings, B indicates a portion of the dome of a locomotive or other boiler. The valve parts shown in the drawings, excepting those pertaining to the within-described improvements, are substantially those constituting what is known as the Richard son safety-valve, which was patented J anuary 19, 1869, No. 85,963, to which patent, for a specific description of the safety-valve, reference may be had.

The valve 0, the form of which is fully shown in Fig. 2, has its seat upon that part of the circular plate or flange a surrounding the upper open end of the cylindrical valvechamber a, the latter constituting a part of the plate a. A second valveseat, e, is formed in the lower end of the chamber a, and said end is screw-threaded to providefor screwing the valve-cagefthereon in theposition shown in Fig. 1.

The valve 0 has a square socket, d, in its lower end to receive the squared end d of the shank d of the lower valve, 0. The square socket and shank connection between the valves 0 and 6 provides for turning the two valves one by the other, for freeing and cleaning them. Butfor the action of valve 6 to antomatically shut off the steam, as hereinafter set forth, said connection between the two valves is not essential; but the shank (I may have a round end entering a suitable socket in the valve 0.

The valve eis held in its proper position at the end of chamber a by the cage f, directly under the seat 6' at the lower end of said chamber, the end of the shank d of said valve entering the socket d in valve 0, and extending to near the end of the socket, so that the movement of valve 0 toward its seat must be controlled by the movement of valve 0 in the same direction.

The plate a is firmly bolted to the dome B, as shown, the posts b b of the spring-yoke A being attached to said plate.

A guide-bolt is screwed into valve 0 and passes through a crossbar secured to the upper ends of the posts I) b, and the usual spring surrounds said bolt,whose ends have a bearing against valve 0 and the under side of said cross-bar, whereby said valve is held to its seat.

The operation of my improvements is as follows: The valve 6 cannot move against its seat 6 while the yoke parts A, including the valve-spring, are intact, and said spring holds valve 6 on or very near its seat; but valve 6 may, with valve 0, have the limited movement which the latter has when steam is blowing oft. But when by accident the parts above the dome B, which guide and hold valve 0 against the steam-pressure of the boiler, are broken ofi' and valve 0 is blown from its seat and away from the shank d, the valve e,properly guided by the cage f,is immediately driven against its seat 6, stopping all escape of steam or water, and preventing persons on or near the engine from being scalded thereby in the manner that they are when, under ordinary conditions, nothing prevents the steam and water from escaping when said valve 0 is blown away.

The cage f serves to retain the valve 6 in proper position when the pressure on the boiler ceases, so that a new valve 0 can be placed in the chamber a, and brought into proper connection with the valve 6, as before.

The employment of valve 6 and the cagef is not necessarily limited to the precise construction of safety-valve herein shown, but they may be used in connection with any safety-valve so constructed that its pressureresisting valve, answering in function to the valve 0, is capable of being blown away from the boiler, as above described.

What I claim as my invention is- 1. In combination witha safety-valve opening outwardly, and mechanism to permit the same to open automatically under pressure,

an interior valve-seat and valve, the valve be ing loosely connected to the safety-valve and I 5 held off its seat by said safety-valve when closed. substantially asdescribed.

2. The combination, with the boiler, valveseat, and spring-pressed valve 0, of the valve 6 in a cage in the boiler, said valve having a 20 polygonal stem, d, entering acorresponding aperture in the body of valve 0, as set forth.

W. E; GRANGER. Witnesses:

HENRY KNOX, WM. H. CHAPIN.

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