US 1508635 A
Description (OCR text may contain errors)
sept. 15 .1924. 1,508.635
' R. C. WOODHAM I SAFETY BLOW OFF. VALVE Filed Sent; 16, 1922 2 Siesta-Sheet l wuentoz Sept. 16, 1924, 1,508,635
7 R. C. WOODHAM SAFETY snow OFF vulva Filed sent} 16, 1922. 2 Sheets-Sheet 2 Patented Sept. 16, 1924.
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Application filed September 16, 1922. SerialNo. 588,727.
To alZ whom it may concern Be it known that I, RAYBON C. VVOODHAM,
a citizen of the United States, residing at Montgomery, in the county of Montgomery and State of Alabama, have invented certain new and useful Improvements in a Safety Blow-Off Valve, of which the following'is a specification.
My invention relates to improvements in safety blowoif valves.
An object of my invention is to provide a safety blowoff valve wherein, if the operating mechanism therefor becomes broken, the steam is positively prohibited from escaping, thereby preventing burning or otherwise injuring persons who might be standing nearby.
A still further object of my invention is to provide a safety blowoif valve wherein if the engine had a side rod get loose and break, the operating mechanism for my safety blowoff valve, there would be no loss of water and steam and the engineer could make the necessary repairs and proceed without blockin g the tratlic which would be the case if the old form of valve was used.
A still further object of my invention is to provide a safety blowoff valve that will not allow the steam to escape when the engine is wrecked thereby insuring the safety of the lives of the engineer and others against burning by the steam.
' A; still further object of my invention is to provide a safety blowoff valve which may be easily opened when desired and that is strong, durable, simple and inexpensive in construction and that is well adapted to the use for which it is designed.
Other objects and advantages of the invention will. become apparent during the course of the following description.
In the drawings, wherein like numerals:
are employed to designate like parts throughout the same,
Figure 1 is a longitudinal section through the valve structure,
Figure 2 is a section taken on line 22 in F 1, looking in the direction of the arrow,
Figure 3 is a section taken on line of Fig. 1, looking in the direction of the arrow,
Figure 4 is a detail view of the valve stem guide yoke used in conjunction with my in vention,
Figure 5 is a side elevation of'apparatus embodying my invention, and
Figure 6 is anend elevation of the cage member. p
In the drawings, wherein for the purpose of illustrationis shown the preferred em: bodiment of my invention, the numeral 10 designates the boiler wall which is provided with a threaded opening adapted to receive the body portion 11 which is of hollow cylindrical formation provided adjacent one end with the threads 3, while the other end thereof is provided with a hollow semispherical extension 13 having internal threads adjacent its end for receiving the casing member 1a which is provided with internal threads 15 intermediate its ends for receivingthe vvalveseat 16, which is prefer ably provided with hexagonal faces 17 as is clearly shown in Fig. 2 of the drawing, so that an ordinary wrench may be'used to remove the valve seat when it is necessary. A head 18 is threadedly mounted on the end of the casing member 1% being provided with a centrally located aperture for receiving the bushing 1.9 through which the rod 20 slides to project interiorly of the casing member 1 1.
A valve 21 provided with a downwardly extending-pin 22 is movable within the portion of the casing member'lt adjacentthe 1 extension 13 and is adapted to engage with the valve seat 16; This valve 21 is mounted on the valve rod 20 and held securely in place by'means of jam nuts 23. The downwardly extending pin 22 of the valve 21 is adapted to be received between the spaced upwardly extending flanges 24: formed in the casing member 14. It will thus be seen that by reason of the pin 22 slidably mounted between the upstanding flanges 2 1, the valve 21 will positively'be guarded against lateral movement and swaying from its original seat by whirling sprays of water and steam blowing against it from the boiler when in use. A valve stem yoke guide 25 is mounted within the body member 13 by means of the screw threads 26. The valve stem rod 20 extends through the valve 21,;the valve stem yoke guide 25 and projects through the body 11. One end of a coil spring 2'! bears against A cage sleeve 28 has one end provided with threads 29 for engaging the threaded reduced end of the body 11 and its other end closed by a nut shaped wall 30 so that a wrench may engage therewith, the end of the body portion 11 being formed with a valve seat 31 engageable by a ball check valve 32 confined within said cage sleeve 28. This cage sleeve and its end wall is formed with a plurality of apertures 33 so that the water and steam may be passed therethrough whereas foreign matter will be prevented from passing therethrough such as filings or other light foreign substances which are usually found in a boiler. When the check valve 32 is seated upon the valve seat 31 it is in engagement with the terminal end of the stem 20.
An operating mechanism is provided for the valve stem rod20'comprising a fulcrumed support 34 upon which is mounted a lever 35 pivoted intermediate its ends and curved downwardly so as to pivo-tally engage the rod 20 as at 36. A suitable handle member 3'7 is engaged with the other end of the lever 35 whereby? it may be fulcru'med for pushing inwardly upon the rod 20 thereby unseating the valve 21 which also moves the stem so as to unseat the check valve 32 and allow the boiler steam to escape. The immeral 38 designates a suitable Water out- It will thus be seen that I have described a safety blow off valve, that will positively not allow steam or water to escape, except when the handle 37 is operated. In other words the steam pressure within the boiler will at all. times hold the check valve 32 in engagement with its seat 31 until the rod 20 which is operated by the lever 35,
.unseats the ball 32 thereby allowing the steam and water to escape through the body 11, the casing 14k and then through the pipe 38. It will further be noted that ii the steam pressure gets so low that the pressure will not be sufficient to hold the ball 32 in its seat 31, the valve 21 will prevent the steam from escaping and as the pressure within the boiler increases, the ball 32 will be caused to seat in the seat 31. It is to he noted that'the valve stem guide yoke is so constructed that the steam and water passing through the body 11 is unhindered but 1t does form an adequate support for the valve stem 20. My invention is a decided improvement over the other forms of blow off valves now in use, in that it positively prevents the escape of steam if the operatspirit of my invention or the scope of the subjoined claims.
Having thus described myinvention, I claim 1. A device oi. the class described includ ing a valve body portion having a pair of valveseats therein, a disk valve engageable with one of the valve seats, a ball check valve engageable with the other valve seat, a cage member for receiving the ball valve when in open position disposed adjacent its valve seat, a stem projecting through the first mentioned valve engageable with the ball valve to move the ball valve from its seat when the disk valve is moved from its seat, and means forholdingthe disk valvenormally in engagement with its seat, and means for moving the disk valve from its seat when desired.
2. In combination, a body portion having a valve seat adjacent one end, and an enlarged extension at its other end a valve casing member threadedly mounted in said enlarged extension and provided with a valve seat intermediate its ends, a disk valve engageable with said latter valve seat, means for moving the disk valve from its seat, a stem projecting through the disk valve and through said body portion, a valve stem guide threadedly mounted in said body portion in its enlarged extension, said stem projecting through said guide, a spring disposed about the stem between the guide and the disk valve, a cage on the end of said body portion adjacent its valve seat, a check valve mounted in the cage and adapted to be moved from its seat by the stem when the disk valve is moved from its seat in the manner and for the purpose specified.
In testimony whereof I affix my signaturein presence 01 two witnesses.
RAYBON C. WOODHAM.
- lVitnesses: WV. B. Honors,
CLAXTON C. DE LANEY.