US1291843A - Valve. - Google Patents

Description

L. M. GREEN.

VALVE. APPLICATION FILED SEPT.26, 1917.

Patented Jan. 21, 1919.

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UNI AS PATEN T OFFICE.

LEONARD MELVILL GREEN,

0F PERTH AMBOY, NEW JERSEY, ASSIGNOR T0 CHILE EXPLORATION COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW 3' Specification of Letters Patent.

Patented Jan. 21 19 19.

Application filed September 26, 1917. Sierial No. 193,284.

To all whom it may concern:

Be it known that I, LEONARD M. GREEN, a subject of the King of Great Britain, residing'at Perth Amboy, in the county of Mid- 5 dlesex, State of New Jersey, 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.

This invention relates to improvements in valves and more particularly in straight-way valves having a diaphragm instead of a stuffing-box for preventing leakage around the valve stem.

In valve constructions intended for use in connection with acid conduits and for other purposes it is important to avoid stuifing- 20 boxes around the valve stem such as would permit leakage or afford opportunity for corrosion. When a diaphragm is used in place. of the stufling-box or gland, and the diaphragm is secured to the valve stem and valve casing, the valve stem is thereby pre vented from rotation, and the valve can only be operated by raisingand lowering the valve stem. With the usual valve constructions, the prevention of rotation of the valve stem requiresthat the valve itself shall be of a type which is operated by raising and lowering of the valve incident to the rais ng and loweringof the valve stem, and rotation of the valve as well as of the valve stem is precluded.

The present invention relates to an mproved construction of valves of the rotating plug type, such as straight-way valves, where the valve is opened and closed by rotation of the plug or equivalent structure; and the present invention provides an improved constructionghaving the advantages of the diaphragm packing for a non-rotatable valve stem, and combining therewith the advantages of a rotary valve.

The valve construction-of my invention 1s made up of a valve casing with a rotatable valve plug therein and with the usual nlet and outlet. The valve stem is arranged to be raised ,and lowered and is provided with a diaphragm secured thereto and to the valve casing so that rotation of the valve stem is prevented. There is also provlded means i for effecting rotation of the plug, without rovalve and valve tation' of the stem, raised or lowered.

It will be evident that various types and arrangements of valve casings and of rotary cocks or plugs are available, and that the details of these can be varied widely. The valve stem and the particular nature and arrangement of the diaphragm packing are similarly capable of modification and variation. I have found it of advantage, however, to use a tapered rotatable plug with a correspondingly tapered seat in the casing, so that the valve slight wedging action; and I have also found it of advantage to operate such a valve so that it is first raised from its seat and then rotated. The details of the valve seat e. .g., Whether a rubber packing or rubber seat is provided or not are details which will vary with the type of the valve and its intended purpose. The materials of which the valve and valve casing and diaphragm are made will also vary with the size of the valveand its intended use. Thus, for acid-resisting valves, the parts may be made of silicon, iron, or copper, or other acid-resisting material.

The invention will be further described in connection with the accompanying draw ings illustrative of one embodiment thereof. In the accompanying drawings, Figure 1 shows a valve construction illustrative of the invention in central, vertical section and with the valve closed; Fig. 2 is a horizontal, sectional view of the valve casing and valve taken on the line 2-2 of Fig. 1; Fig. 3 is an enlarged elevation of the lower part of the when the valve stem is view taken on the line H of Fig. 3; and Fig. 5 is a view similar to that of Fig. 4. with the parts in a different position.

In the construction illustrated, the valve casing 1 is of tapered or inverted frustoconical shape and hasthe connections 2 and 3 which are usual in valves of thestraightway type. The casing is closed by the top or cover member l, suitably secured in place, and having upwardly extending arms 5 within which the operating handle or nut 6 is rotatably mounted. Between the top cov member 4 and the casing is clamped the diaphrgam 7 which is also rigidly secured to the valve stem 8, preventing rota tion thereof. It will be observed by refermay engage its seat with a casing; Fig. 4 is a sectional to the upper part of the valve in such a way that relative rotation of the valve and valve stem can take place. In the construction shown, the lower part of the valve stem 9 has an enlarged lower end which is secured by a bearing 11 permitting rotation of the valve with respect to the valve stem.

The valve itself is of the plug or rotary cock type. Instead of being shown as solid or as a complete cylindrical or tapered member, it is shown as having the two valve members 12 and 13 of proper shape and deand these members are unlted together si n by? arms 14: at their lower ends. The valve is provided with a tubular extension 15 to receive the pin or PIOjQCtlOIl 16 which is in turn secured to the bottom of the valve casing 18 by means of an intermediate union 17 The tubular portion-15 of the valve is slotted at 19 to receive the pin 20 carried by the projection 16. The slot is of a general helical contour but has a vertical portion at its upper end. This slot extends through an angle of 90 degrees and the arrangement is such that, as the valve and tubular member are raised and lowered, the pin 20 will I cause a rotation of the tubular member and of the valve through an angle of 90 degrees. The straight portion of the slot at its upper end permits the valve to be raised from its valve seat, as indicated in dotted lines in Fig. 1, before rotation begins, so that the subsequent rotation takes place after the valve is'freed from its valve seat.

1n the operation of the valve illustrated and described, it will be noted that the valve "stem 8" is prevented from rotation but is arating' handle 6.

ranged to be raised and lowered by the oper- It will be noted also that the valve itself will be not only raised from its seat but also rotated because of the constuction and arrangement of the helical slot then be rotated 19 and pin 20. This arrangement, moreover, is such that the valve will be raised from its seat and then rotated through 90 degrees. When the valve stem is lowered, the reverse actiontakes place, and the valve stem will through 90 degrees to its closed position and finally firmly pressed down against its seat without further rotation. The relative positions of the pin 20 and tubular member 15 when the valve is closed and opened are shown in Figs. 1 and 5.

' It will thus be seen that the valve of the present invention provides a combination of a nonrotatable valve stem with a diaphragm secured thereto, and a rotatable valve gate or plug which is rotated by the raising and lowering of the valve stem, and without rotation of the valve stem, the reciprocating motion of the valve stem being transmitted to the rotatable plug to cause rotation of the same and thereby effect opening and closing of the valve.

It will also be seen that all the moving parts are below the diaphragm so that no leakage due to moving or sliding of any of the parts upon each other is possible.

While I have described and illustrated-one embodiment of the invention, yet it will be understood that the invention is capable of variation and modification in the construction and arrangement and details of the parts, such as the shape and construction of the valve and valve casing, the provision or omission of a rubber seat on the valve or on the valve casing, and the particular means for raising and lowering of the valve stem and for effecting rotation of the valve without rotation of the valve stem; and that such variations and modifications can be made without departing from the spirit and scope of the invention.

I claim 2- 1. A valve structure comprising a valve casing, a rotatable valve plug therein, a bearing for said plug operatively arranged at one end of the plug, a reciprocatory valve stem operatively connected to said plug at the other end thereof, a diaphragm securedto said casing and to said stem, and means cooperating with said bearing for efiecting rotation of said plug when said valve stem is moved in or out.

2. A' valve structure comprising a valve casing, a rotatable valve plug therein, a twopart valve stem operatively connected to said plug, a substantially flat diaphragm secured near its outer edge to said casing and secured near its center between the two parts of said stem and arranged to prevent rotation of said stem, one part of said stem being operatively connected to said plug .and

arranged to permit rotation of said plug and the other part of said stem being screwthreaded, a nut rotatably mounted on said casing and engaging the screw-threaded portion of said stem and adapted by its rotation to reciprocate said stem, and means for rotating said plug, without rotation of said stem, when said stem is reciprocated.

3. A valve structure comprising a valve casing, a valve plug. rotatably mountedwithin said casing, a valve stem operatively connected to the upper end of said plug for raising and lowering the same, a diaphragm secured to said casing and to said stem, a tubular extension depending from thelowerend of said plug and having a helical slot therein, a projection secured within said casing and engaging said tubular extension to provide a bearing therefor, and a pin secured to said said helical slot whereby said valve plug is rotated when said valve stem is raised or lowered.

4. A valve structure comprising a valve casing having a tapered valve seat therein, a tapered valve plug coiiperating with said valve seat and rotatably mounted within said casing, a valve stem operatively connected to the upper end of said plug for raising and-lowering the same, a substantially flat diaphragm secured to said casing and to said stem, a tubular extension depending from the lower end of and having a helical slot therein, a projection secured. within said casing and engaging said tubular extension to provide a 'bearing therefor, and a pin secured to said projection and engaging in said helical slot whereby said valve plug is rotated when said valvestem is raised or lowered.

5. A valve structure comprising a valve casing having a tapered valve seat therein, a tapered valve plug cooperating with said valve seat and rotatably mounted within said casing, a two part valve stem operatively connected to the upper end of said plug for raising and lowering the same, a

Copies of this patent may be obtained for five cents each, by addressing the projection and engaging in said plug substantially fiat circular diaphragm secured near its outer edge to said casing and clamped near its periphery between the two parts of said stem, a tubular extension depending from the lower end of said plug and having a helical slot therein, a projection secured within said casing and engaging said tubular extension to provide a bearing therefor, and a pin secured to said projection and engaging in said helical slot whereby said valve plug is rotated when said valve stem is raised or lowered, said slot being arranged to permit raising of said tapered valve plug from its cooperating seat before rotation of the plug takes place.

6. A valve structure comprising a valve casing, a rotatable valve plug therein, a, valve stem operatively connected to said plug and arranged to permit rotation of said plug without rotation of said stem, a diaphragm secured to said casing and to said stem and arranged to prevent rotation of said stem, said valve stem having a screwthreaded portion, a rotatably mounted nut engaging the screw-threaded portion of said stem and adapted by its rotation to reciprocate said stem, and means for rotating said plug, without rotation of said stem, when said stem is reciprocated.

In testimony whereof I aflix my signature.

LEONARD MELVILL GREEN.

"Commissioner of Patents,

Washington, I). C."

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