US 600249 A
Description (OCR text may contain errors)
W. C. PARSELLS. VALVE.
No. 600,249. Patented Mar. 8, 1898.
\ Jun/11] WITNESSES: INVENTOR ATTOR N EYS lhvi'rnn STATES PATENT GFFIGE.
\VILLIAM O. PARSELLS, OF ELLENVILLE, NElV YORK.
SPECIFICATION forming part of Letters Patent No. 600,249, dated March 8, 1898.
Application filed May 17, 1897. Serial No. 636,967. (No model.)
To a, whom it may concern.-
Be it known that I, WILLIAM G. PARSELLS, a citizen of the United States, residing at Ellenville, in the county of Ulster and State of New York, have invented certain new and useful Improvements in Valves; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.
My invention relates to cocks and valves; and it consists in the novel construction of the valve, whereby I am enabled to avoid the use of a stuffing-box to prevent escape around the valve-sten1 and to render the valve more reliable and less subject to derangement, and in the novel combination, construction, and arrangement of the parts of the valve.
The objects of my invention are, first, to improve the construction of cocks or valves and avoid the use of stuffing-boxes therein by employin g an extensible and compressible drum or chamber in lieu of the stuffing-box, by protecting such drum or chamber from the direct action of the steam or other fluid in the valve and from sudden internal shocks and stresses, such as are caused by water-hammer, by so constructing and arranging the parts that in the event of the bursting of this drum or chamber the escape of steam or other fluid will be inconsiderable, so that the closing of the valve by hand will not be prevented, by so constructing and arranging the parts that when used on pipes containing a heated fluid, such as steam, the external parts will be comparatively cool, and by providing suitable guides for the valve-stem; second, to so design, construct, and arrange those parts of the cook or valve in which the invention particularly resides that they may be applied to existing valves of common types without altering the general design and construction of such valves, and, third, to make the valves simple, compact, durable, and comparatively inexpensive. These objects are attained in the improved cook or valve herein described, and illustrated in the drawings which accompany and form a part of this specification, in which the same reference-numerals indicate the same or corresponding parts, and in which-- Figure 1 is an external elevation of a globe valve of common type constructed in accordance with my invention, and Fig. 2 is a central vertical section of the said valve.
The valve-casing of the valve shown in the drawings consists of two partsviz. the main portion or globe 1, having the usual bridge 2, with the valve-seat 3 and valve-opening 4 therein and having the usual end connections for pipes or the like, the globe 1 being in all respects the same in construction as the corresponding part of an ordinary valve of the same type, and the plug 5, closing the globe 1 at what may be termed the top, opposite the valve-opening 2, this plug 5 occupying the position usually occupied by the part of an ordinary valve which surrounds the valvestem and contains the stuffing-box. The plug 5 screws into or is otherwise secured in the opening in the top of the globe 1.
6 is the valve-plug, and 7 the valve-stem, passing through a closely-fitting aperture in the plug 5.
A compressible and extensible chamber or drum 8 surrounds the valve-stein 7. This drum is formed, preferably, of some thin strong metal, such as copper, corrugated, as shown, to give it strength and elasticity-that is, to permit its being compressed or elongated. One end of this drum is secured to the plug with a steam-tight joint, the other end being secured in a similar manner to the valve-stem 7. These joints may be screwjoints, most conveniently, as shown, screwthreaded rings 8' being brazed or otherwise tightly secured in the ends of the drum and screwing tightly upon shoulders 9 and 10 011 the plug 5 and valve-stem 7, respectively. The valve-stem 7 does not rotate, so that the joints between the drum 8 and the valve-stem and plug 5 may be made perfectly tight and incapable of permitting the escape of the slightest vapor. They may even be brazed or soldered joints.
Surrounding the drum 8 and screwing upon the plug 5 or otherwise held stationary with respect to parts 1 and 5 is a casing 11. A
bushing 12, surrounding the valve-stem 7 and connected to or formed integrally with the operating-whee113, screws into the top of the casing 11. The inner end of this bushing bears against some projection on the valvestem 7, as the shoulder 10, and the other end of the bushing or the hand-wheel 13 also bears against some projection on the valvestem 7, as the head of the screw let. Rotation of the hand-wheel 13 in either direction therefore causes longitudinal movement of the valve-stem 7. moved, the flexible drum 8 is elongated or shortened, as the case may be, its corrugated sides permitting of considerable change in its length without injury.
' The valve-stem is guided at a point near the valve-plug by the plug 5, thusinsuring that the valve-plug shall always seat fairly on the valve-seat. The drum 8 is protected against sudden shocks occurring within the valve itself or the pipes connected thereto, such as the shock caused by water -hammer, for since the passage between the stem 7 and the plug 5 is very restricted no great variations of pressure in the pipes can reach the drum suddenly. The possibility of the bursting of the drum 8 is therefore reduced to a minimum. Furthermore, even should the drum 8 burst the valve is so constructed that no considerable escape of steam or other ,fluid could take place such as would be sufficient, in the case of steam, to prevent or make very difficult the closing of the valve, for only such steam can escape after the bursting of the drum 8 as leaks through between the stem 7 and the plug 5 and then between the bushing 12 and the casing 11.
Since the drum 8 is surrounded by an airspace, when the valveis used as a steam-valve the casing 11 and the hand-wheel 13 will always be comparatively cool, so that the valve may be easily operated.
This invention may be applied readily to valves already in use. I The main portion of the casing of the valve is unchanged in proportions or construction. The plug 5, together with the valve plug and stem and the other parts of the valve connected therewith, may be substituted for the stuffing-box, valve plug and stem of valves now in use.
The invention may be applied not only to globe-valves, but to any other type of cook or valve in which stuffing-boxes are used at present.
In the following claims I employ the term valve as covering cocks or valves gener-.
ically and not simply the particular type of valve shown in the drawings, and I employ the term .valve-plug to include generically all devices for-closing a valve-opening When the valve-stem is thus and not simply the particular type of valve plug or closure shown.
I do not limit myself to the particular details of the construction shown in the drawlugs.
Having thus completely described my invention, what I claim, and desire to secure by Letters Patent, is
' 1. The combination, with a valve -casing having a valve-seat and an opening opposite said seat closed by a removable plug, and a valve-plug having an operating-stem passing through an aperture in the said closing-plug, of a flexible chamber surrounding the valvestem and said opening in said closing-plug and secured to said plug and to the valvestem, externally of the valve-casin g, a second casing surrounding said flexible chamber and secured to the valve-casing, and a bushing surrounding the valve-stem beyond the flexible chamber, having screw-threads engaging corresponding threads of said second casing, and engaging projections on the valve-stem, whereby when said bushing is rotated the valve is open ed or closed, according to the direction of rotation, substantially as described.
2. The combination, with a valve-plug and valve-stem therefor, a closing-plug adapted to fit into the opening in the top of a valvecasing, and form a part thereof, and having an opening through which said valve-stem passes, and a flexible chamber surrounding the valve-stem and said opening in the closing-plug, and secured to the valve-stem and to said plug, of a casing surrounding said flexible chamber and secured tosaid closingplug, a bushing surrounding the valve-stem beyond said flexible chamber, having screwthreads engaging corresponding screwthreads of said casing, and engaging projections on the valve-stem, whereby when the bushing is rotated the valve-stem is moved longitudinally, and means for rotating the bushing, substantially as described.
3. The herein-described compressible and extensible chamber, formed of thin metal, having its sides corrugated, and having at its ends screw-threaded rings by which it may be attached to the parts with which it is designed to coact, substantially as described.
In testimony whereof I aflix my signature in presence of two witnesses.
WILLIAM o. PARsELLs.
CLARK EATON, WM. H. DEYO.