US372848A - Safety water-gage - Google Patents

Description

(N0 Mode i.)

J.'GRAHAM. SAFETY WATER GAGE.

No. 372,848. Patented Nov. 8, 1887.

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UNITED STATES.

PATENT OFFICE.

v JOHN GRAHAM, OF CHICAGO, ILLINOIS.

SAFETY WATER-GAG E.

SPECIFICATION forming part of Letters Patent No. 372,848, dated November 8, 1887.

Application filed December 16, 1886. Serial No. 221,723. (No model.)

To aZZ whom it may concern.-

Be it known that I, JOHN GRAHAM, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Safety Steam and Water Gages, of which the following is a specification.

My invention relates to that class of safet steam and water gages in which valves are furnished to the upper and lower valve-chests of gage, so that when the connecting glass tube breaks or is otherwise removed the valves in the upper and lower valve-chests close automatically and prevent escape of water or steam from the boiler by way of the passages in said valve-chests.

The object of my invention is to overcome certain defects that automatic gages have un'-' der varying conditions been subject to, notably in gages where the automatic valves nearly fill the valvechambers, directly exposing too great superficial annular area of said valves to the first impulse of the steamor pulsations transmitted to the water in the boiler from the stroke of a piston of feed-pump that may be attached to a boiler using an automatic gage, as gages using large disk-valves under certain circumstances become untrustworthy.

To elucidate, and enableothers skilled in the art to which my invention appertains to construct and use the same, I refer to the accompanying drawings, in which Figure 1 shows a sectional view of my in vention. Fig. 2 represents a front elevation projected from Fig. 1, the blow-off valve-chest Fig. 3 is an outside plan view of the lower valve-chest of my improved gage.

Similar letters of reference indicate corresponding parts.

A represents the upper valve-chest of the steam and water gage.

N represents the lower valve-chest in connection with a water-faucet, said water-faucet being patented to myself February 13, 1883, N 0. 272,040.

D is the water-faucet referred to above.

0 is the glass tube which connects with the upper and lower valve-chests of the steam and water gage, and through which the level of water is shown in boiler or other utensil.

The upper valve-chest, A, is furnished with a valve, B, having a stem, 1), taking intoan annular opening in the cover a of valve-chest A. The stem of said valve B has a collar, b, which acts as a valve in preventing steam from escaping by way of the annular opening into which the spindle of valve takes, said collar bearing against the boss at of valvechest cover a when the valve B is open or off its seat.

When the valve B is shut, a small quantity of steam may escape between the spindle of valve and bore of boss (1 of cover a, into which the said spindle takes. The amount is of little or no consequence, as the valve only requires to be in such position for a very limited period. This arrangement reduces the friction of the valve stem 6 in the annular opening 'of boss (1' to a minimum-in fact, annihilates it to all intent and.purposeand the valve B is always certain to close when placed under the condition for it to prevent escape of steam, as in the case of the glass tube 0 breaklhe valve chest Ai's shown connected with out any intermediate stop-valve between said chest and boiler, and the said valve-chest has a chamber, 0, into which one end of glass tube ,0 projects, and a gland, E, prevents escape of steam from said chamber by way of the exterior side of glass tube.

The valve-chest N- has a valve, 0, with a stem, 0. The stem of said valve has a collar, 0, which restsupon the inner flange, n, of the valve-chest cover a when said valve is open, the inner flange of cover having an annular opening, into which the stem 0 of valve 0 takes.

The valve-chest N has a chamber, 0, for the lower end of glass tube 0 to take into, and said chest is also furnished with a gland, E,

to prevent escape of steam or water from the said chamber by way of the exterior side of glass tube.

The valve-chest N has a screwed spindle, R, taking into a boss, a, formed upon the side of valve-chest N, the inner end of said spindle taking into an opening formed in the interior division-wall of the passage n, which communicates both with the valve-chamber r and chamber r, that has free communication with the glass tube. The boss n", into which the screwed spindle R takes, is furnished with a ICO , the chamber 1' and from thence be conveyed by gland, S, to prevent escape of steam or water by way of screwed spindle. From one side of the valve-chest N projects the blow-off valvechest U (shown in section in Fig. 2) with a common cone-valve, V, having a screwed spindle, 1), taking into the valve-chest cover n, and which is furnished with a gland, a, to prevent escape of steam by way of spindle of said valve. Inserted in the branch leading to chamber of blow-off valve V is a perforated plate or wiregauze screen, it, to prevent any broken glass or other material from entering the chamber of blow'offvalve, for when a glass tube breaks portions of said tube are liable to drop down into the force or velocity of steam into chamber of blowoff valve V when not otherwise prevented.

The waterfaucet D (shown in connection with the valve-chest N) is not necessary to be used. In occasional cases such, however, can be used in connection with one or both of the valve-chests containing the automatic valves to advantage.

Having described the several parts of my invention, the operation of same is as follows: The upper and lower valve-chests, A and B, being connected by a glass tube, 0, and the automatic valves B and 0 remaining closed, it becomes necessary to force them from their seats, that the glass tube 0 can have full communication with the steamboiler, that the level of water in the boiler may be indicated 1 in the glass tube 0. The water-faucet D, when used in combination with the valve-chest N of gage, is first acted upon to admit waterl-into the chamber r of said valve-chest, the pressure of the water in the boiler acting upon the valve 0 to hold it closed until communication is made to the opposite side of said valve. The pressure of the steam in the boiler holds the valve B in valve-chest A also closed until communication with the boileris made to the opposite side of said valve, and the said valves are both opened conjointly by admitting water i from the boiler to enter the glass tube by way of the passage n, formed in lower valve-chest. N. The cone-valve formed on the inner end of screwed spindle R,when said spindle is turned back, admits the water from boiler to enter said passage 01/ of valve-chest N, and the steam in boiler acting upon the water forces the water through the glass tube 0, so that both the valves B and O are forced open. A greater superficial effective area being exposed to the pressure of water and steam by the inner faces of said valves, they must necessarily open and remain in such condition until a reverse action takes place, and which occurs immediately upon the glass tube Obreaking, which destroys the equilibrium of forces between the upper and lower valve-chests containing the automatic valves B and O.

I am aware that gages having automatic valves are already in use, and therefore do not claim the automatic valves broadly; but

What I do claim is as follows:

1. In a safety steam and water gage, the combination of a valve-chest, A, and valve B, having stem 1), with collar 1), the said stem taking into a free and annular opening in cover ct,the glass tube 0, connecting said valvechest A with valve-chest N, having valve 0, with stem 0, taking into annular opening of inner flange, n, in valve-chest cover n, and the screwed spindle R, taking into boss or, forming part of valve-chest N, the inner end of said spindle It taking into the annular opening of inner division-wall of passage 11', so that communication can be secured with the glass tube independent of the passages that may be closed by the valves 13 and O, substantially as shown and described.

2. In a steam and water gage, the combination of valve-chest N and valve 0, with projecting stem 0, with collar 0, said valve-stem taking into inner flange, n, of valve chest cover 12, and the screwed spindle R, taking into boss at, projecting from valve-chest N, of the passage n, communicating with the chambers rand r'and controlled in said communication by screwed spindle R, substantially as shown and described.

JOHN GRAHAM.

\Vitnesses:

M. W. JOHNSON, JOHN J. HARDEN.

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