US903114A - Valve for gage-cocks. - Google Patents

Description

M. P. SNELL.

VALVE POR GAGE GOCKS.

APPLIUATION FILED AUG. 17, 1907.

903,1 14. n Patented Nov. 3, 1908.

ff i l I,

narran sTaTns TATnNT armen.

MARO P. SNELL, OF MACON, GEORGIA.

VALVE FOR GAGE-COCKS.

Application filed August 17,

To all whom 'it may concern:

Be it known that I, MAP@ P. SNELL, a citizen of the 'United States, residing at Macon, in the county of Bibb and State of Georgia, have invented certain new and useful improvements in Valves for Gage-Cocks, of which the following is a specification.

ln the use of gage cocks for steam boilers of the ordinary construction much trouble is experienced by the leakage of the valve caused by sediment or small particles of grit or lime, such as are held in suspension in the water, lodging between the valve and its seat.

The object of my said invention is to provide a valve for gage cocks, and other purposes for which it may be found suitable, by the use of which any foreign substance of the character stated becoming deposited on the valve seat m-ay be readily removed or worn away by the manipulation of the valve itself, all as will be hereinafter more fully described and claimed.

Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts: Figure l is a side elevation of a gage cock of my improved construction, Fig. 2 a vertical longitudinal section through the same, and Fig. 3, a cross section on the dotted line 3 3 in Fig. 2.

In said drawings the portions marked A represent the side of a boiler7 B the gage cock casing, and O the valve.

n use the gage cocks may be arranged as usual, one at each level where it is ordinarily desired to test the water in the boiler, or other container. Each being a duplicate of the other in construction only one valve will be illustrated and described. It will be understood, of course, that this invention may be used with any boiler or other fluid container with which it is desired to use a gage cock. A screw-threaded perforation is formed in its side A into which the screwthreaded end of the gage cock may be inserted.

The casing B of the gage cock is a casting of suitable form its inner end being screw-threaded and adapted to lit into the screw-threaded perforation in the side of the boiler provided therefor. It is provided with a central perforation b leading from the valve. seat into the boiler, or other vessel to which it is attached, and a perforation b leads from a point just outside of said valve Specification of Letters Patent.

Patented Nov. 3, 1908.

1907. Serial No. 389,080.

seat at right angles with perforation Z), through said casing, being preferably provided with a nipple b2 at the outer end thereof. 'The valve seat 3 is formed at the inner end of the perforation Z) and a short distance outside of said valve seat is formed a shoulder b4. A washer o is mounted against said shoulder b4 anda gland or stuffing-box B is inserted in an enlarged perforation in the outer end of said casing B by means of interengaging screw-threads formed on the respective parts, said gland being formed with holes 7L at intervals around its outer end for the engagement of the prongs of a spanner wrench. On the inner end said gland is provided with a packing-ring be, consisting of any suitable material for the purpose, thus insuring a tight joint between the valve stem and said gland. A small chamber is thus formed between the valve seat and packing connecting the perforations Z) and b. The outer end B2 of said casing B is formed with an enlarged perforation also screw-threaded into which the tubular shank of a hollow nut B3 is inserted and said part B2 is connected to the main part B by arms, or side-pieces, bT on opposite sides.

The valve C is preferably a straight rod formed with an inner end adapted to seat snugly upon the valve seat b3 of the casing and having a hand wheel C4 on its outer end. lt passes through the gland B and packing-ring b on the inner end thereof. At a point normally between the parts B and B2 of the casing it is formed with a screw-threaded portion c on which a nut C is mounted. Said nut C is formed with square ends and fits to slide between the arms or side-pieces ZF. A spring c2 is interposed between said nut C and the nut the outerl end of said spring being incased in the tubular portion of said nut B3 and its inner end surrounding the shoulder C3 on the outer face of said nut. Shoulders bs are formed midway on the adjacent faces of each side-piece 6T against which said nut C may rest at the limit of its inward motion. The screw-threaded portion c of the valve stem is slightly larger than its ends, forming a shoulder c5 at the rear end of said portion, which is adapted to strike the inner face of the nut B3 and prevent the valve stem from passing through said nut or being`V blown out of the casing should the operator carelessly screw the part c out of the nut C.

In operation, the parts being adjusted as shown in Fig. Q with the valve resting upon the valve seat and the gland B screwed into place so as to form a tight joint, the spring c2 bears against the nut C and holds the valve, which is connected thereto by the screw-threads, to its seat andV thus prevents the water in the boiler from escaping through the nipple b2. When it is desired to open the valve to test the water in the boiler, the valve is backed off its seat by turning the valve stem in the nut C', by means of hand wheel C4. held against the shoulders 58 by means of the .spring c2, the threads c will operate to draw said valve off its seat, as will be readily understood. If the inner end of the gage cock is still immersed in the water in the boiler the water will then blow out through the nippleb2, while if the water is below the gage cock the steam will blow out and the engineer' will thus be able to test the level of the water at any time. After testing the water the operator turns the hand wheel C4 forward which operates in a like manner to close the valve. Inasmuch as the nut C is permitted a longitudinal movement between the side-pieces 57, sliding from the shoulders bs towardthe outer end of the casing, the operator usually turns the valve in both opening and closing further than is necessary, there being no Vpositive limit, so that the motion of the valve continually wears or grinds upon the seat and keeps it clean, and should any foreign substance become lodged thereointhe operator by turning the valve back and forth with the spring bearing it against the seat will soon be able to wear the substance away so that the valve will seat tightly and prevent any leakage. lIt will be noticed also that the gland B 'is of a length so that when withdrawn to the front face of the nut C its forward end with packing b will be outside of the casing B so that it may be rewound, or the packing-ring renewed at any time while the boiler is being used and while the valve C is closed, for while the valve C is closed said gland may be turned back without opening the perforation leading into the boiler.

It will be understood that nut C may at any time be run back on the threaded portion o of the stem C by turning said stem forward, either for the purpose of securing more room in front of ysaid nut for convenience in placing the packing on the fiont end of gland B or for the purpose of increasing the tension of spring c2, should itk become necessary. The tension of said spring may also be adjusted by the manipulation of nut B3, as will be readily understood. Y

Having thus fully described'my said in- Said nut being ventioii, what I claim as new and desire to secure by Letters Patent, is:

1. Apvalve for gage-cocks, ete.,r comprisingk a easing containing a valve seat, a valve stem mounted in said 'casing and `formed with a screw-threaded portionga Ynut on said screw-threaded portion mounted between a .shoulder in said casing on `one'side and a spring on the other side, whereby said valvej may be turned beyond'thepoint of closing against said seat, substantially asset forth.

2. In' a gage-cock, the combination, of the casing, a valve therefor comprising a stein formed with a screw-threaded portion and).l a nut mounted on said screw-threaded por- Y tion between a fixed portion of said casing on one side anda yielding holding device on its opposite side, substantially as set forth.

3. In a gage-cock, the combination, of the casing, a valve therein, means for holding said valve yieldingly to its seat, and means on its stein for adjusting and supporting it away from its seat, substantially as set forth.

5. In a gage-cock, the combination, of the casing, a valve therein formedy on a stem having a screw-threaded portion, a nut on said screw-threaded portion, a spring bearing against the rear side of said nut for holding the valve to its seat, and rigid abutments on the casing for limiting the Inove-V inent of the nut toward said seat, substan tially as set forth. Y

G. In a gage-cock, the combination, of the casing having a valve seat therein, a valve mounted to be adjusted longitudinally in said easing, saidvalve comprising a rod'or stem with the valve formed on its inner end, a screw-threaded portion midway its length and means for turning it on its outer end, the nut on said screw-threaded portion, another nut in the outer end of the casing, and a spring interposed betweensaid'nuts, said stem being formed with an enlarged portion which will not pass through the nut in said casing, substantially as set forth.

In witness whereof, I have hereunto set my hand and seal at Vashington D. C. this 14th day of August, A. D nineteen hundred and seven.

MARO I. SNELL. [ns] Vitnesses z e E. W. BRADFORD, ANNA M. SMALLwooD. Y

Images