US433618A - William f - Google Patents

Description

(No Model.)

W. P. CUNNINGHAM.

VALVE POE. STEAM BOILERS.

No. 433,618. Patented Aug. 5, 1890.

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' UNITED STATES PATENT" OFFICE.

WILLIAM F. CUNNINGHAM, OF BROOKLYN, NEl/V YORK, ASSIGNOR OF ONF- HALETO ENOOH RUTZLER, OF SAME PLACE.

VALVE FOR STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 433,618, dated August 5, 1890. Application filed November 2, 1839. Serial No. 329,027. (No model.)

To aZZ whom, it may concern.-

Be it known that I, ILLIAM F. CUNNING- HAM, of the city of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Valves for Steam-Boilers, Radiators, and other Purposes, of which the following is a specification, reference being had to the accompanying drawings.

m This invention relates to combined pressure and vacuum valves, consisting of a safety valve to prevent explosion by pressure within an apparatus and a vacuum-valve to prevent collapsion by pressure Without on the r 5 formation of a vacuum within the apparatus.

My invention consists in the novel combination, hereinafter described and claimed, of the two valves and their box, whereby great simplicity is obtained.

Figure 1 is a central vertical sectional view of the combined safety and vacuum valve embodying my invention. Fig. 2 represents a horizontal section in the line a m of Fig. 1. Fig. 3 represents a horizontal section in the line 3 3 of Fig. 1.

Similar letters of reference designate corresponding parts in all the figures.

A is the valve-box, having in its bottom an opening a, through which communication is to be made with the boiler, radiator, or other ap paratus, to which the combined safety and vacuum valve is to be applied. The connection of this box with the boiler may be made by a screw-thread Z) around the said opening a or in any other convenient manner. At the top of the opening a is a safety-valve seat 0, to which an outwardly-opening safety-valve 13 is fitted. The stem B of this valve passes through a guide A in the top of the valve- 0 box A and a guide A within the said box, and is represented as being loaded by a ball or weight D, directly applied to its upper end, but may be loaded externally in any wellknown way. The said guide A is formed by 4 5 simply making the said box with a contracted neck and boring out the said neck for the stem to pass through. Openings d are provided in the sides of the box A for the escape of steam when the safety-valve B is lifted by excessive pressure at the opening a.

I will now proceed to describe my improvement. The valve-stem B is made hollow, and

an opening is made through the valve B in line with the stem, so that there is a passage directly through the said valve and stem,and 5 around the lower end of this passage is formed a seat 6 for the vacuum-valve E, the said seat facing in the opposite direction to the safetyvalve seat 0 and the two valves also facing in opposite directions. The vacuum-valve E is closed upward against the seat 6 by pressure through the opening a. In the sides of the hollow safety-valve stem E there are openings (2, so that air entering the valve-box A through the opening (Z may pass through the said openings 6 through the passage formed in the stem B and valve B and through the valve-seat 6 when the valve B is opened, as

it will be when the pressure at the opening a is considerably less than the pressure of the atmosphere.

The stem E of the vacuum-valve B passes into the passage provided in the safety-valve and its hollow stem B, and in order that the said stem E may not interfere with the free ingress of air through the said passage the said stem must be so constructed that While it is guidedwithin said passage there may be room for the circulation of air outside of it within the said passage, and for this pur- 8o pose I have represented it of polygonal form in its transverse section, (see Figs. 2 and 3,) the said passage having a circular transverse section.

In order that the vacuunrvalve may always remain closed until the pressure in the opening a is somewhat lower than that of the at mosphere, a light spring f is applied to it for the purpose of closing it. The strength of this spring, which is represented as coiled 0 around the stem, needs only to be slightly in excess of what is necessary to sustain the weight of the valve E. This spring is supported upon an internal shoulder g, provided in the interior of the safety-valve stem B, and its upper end presses against a head or collar 71 secured on the top of the valve-stem E. In order that the air may pass by the shoulder g in the safety-valve stein the opening provided in the said shoulder for the stem Ioe E is made circular and the portion of the said a stem which passes through it is made poly;

onal.

In order to enable the valve-stern E to be guided in the lower part of the passage in the safety-valve and its stem and yet to pass the shoulder g, provided for the spring, the upper part of the said stein E is made smaller than the lower part.

According to my invention, a vacuum-val ve is provided in the same box with a safetyvalve without any unnecessary enlargement of the safety-valve box or of the safety-valve,

and Without any stuiling-box, and neither valve interferes in any way with the operation of the other; the safety-valve being permitted to open in the usual Way by excessive pressure within the apparatus to which it is applied and the vacuum-valve being free to open when the pressure within the apparatus is sensibly less than that of the atmosphere.

What I claim as my invention, and desire to secure by Letters Patent, is

The combination, with the pressure-valve B, having a hollow slotted stem 13' and a vacuum-valve E, arranged Within said pressure-valve, of the Valve-box A, having lateral openings d, an inner guide A for said stem B, and an outer guide consisting of the contracted neckA through which the said stem projects to be loaded externally, substantially as herein set forth.

WVILLIAM F. CUNNINGHAM.

Witnesses:

FREDK. HAYNES, GEO. BARRY.

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