US1406799A - Valve - Google Patents

Description

A. B. WOGD.

VALVE.

APPLICATION FILED MAR. 16| 1920.

Patented Feb. 14, 1922.

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l Mmm/frs .ALBERT B. WOOD, OF NEW ORLEANS, LOUISIANA..

VALVE.

` Slpecication of Iletters Patent. Patented Fab, 14,;1922,

Original application filed Hay 31, 1916, Serial No. 100,845. Patent No. 1,339,997, dated May 11, 1920.

` Divided and this application led March 16, 1920. Serial No. 366,393.

To all whom lit may concern:

Be it known that I, ALBERT B. WOOD, a citizen of the United States, residing at New Orleans, in the parish of Orleans and State' vide a valve the construction of which, while still providing a circular opening will permit flow to take place therethrough, during opening and closing. movements substantially as it would take place for example, through a triangularly ported valve whlch was un-v covered from it apex toward its base.

It is also the object of my invention to provide a valve for a water main which will l offer a minimum amount of interference to the water flowing therethrough andalso the provision of valve stop or positioning means so constructed as to permit the water to flow past practically unimpeded immediately upon opening.

These, together with such other objects as are incident to my invention or may hereinafter appear, I obtain by means of a construction which I have illustrated in preferred form in the ac/companying drawlng,

wherein ,y

Figure 1 is a vertical longitudinal section through a water-main valve casing illustrating my invention embodied therein, andFigure 2 is an elevation of the rear face of the valve. Figs. 3 and 4 are diagrams illustrating valve ports of two forms hereinafter referred to.

Referring to Figure 1, it will be seen that I have illustrated therein a portion of a conduit or valve casing 1 such, for example, as is employed to conduct water from a reservoir or other source to a city main. The water enters through the end 2'and flows out through the end 3. The casing ma' be of any suitable shape, but I prefer to orm it as shown, with two chambers `4: and 5, the

` the annular cell.

chamber 4 being connected to theend 2 and the chamber 5 to the end 3. At its central portion the chamber 4 is made wider as indicated at 6 and in this wider portion is formed an annular cell 7 provided with a screen 8 for preventing trash from entering This ce-ll is connected to a suitable metering device, not shown inasmuch as it forms no part of the present invention.

A valve 9 is located between the chambers 4 and 5 which fits in a seat 10. This valve consists of a hemispherical portion 11 connected to a base 12 by any suitable means, such as a threaded stud 13.- The hemispherical portion projects through the seat 10 toward the chamber 4. The diameter of the base portion 12 is preferably made of the same dimension as the maximum diameter of the hemispherical portion 11, there being a plurality of stop or positioning lugs 14 extending radially from the periphery of the base 12. These lugs engage the edge of the valve seat 10 when the valve is closed. A

- By means of the forked projections 15, pin f cylinder 19.

When the valve opens it swings to the right in the direction of iiow and the interior walls of the opening are parallel to the flow lines of the fluid passing therethrough. Its movement is controlled by means olf the dash pot 20, piston 21 and links 22 and 23.

By making the valve hemispherical and seating it in the manner indicated, I am enabled, during the critical periods of valve openin and closing to secure an opening throug which flow takes place substantially as it would through a triangular opening which was uncovered from its apex to its base. This can best be demonstrated by reference to Figs. 3 and 4. In Fig. 3 the main valve has been shown diagrammati-r cally in a slightly open position andy in Fig. 4 there has been illustrated a port of a triangular shape which has been opened from an apex toward the opposite base 1n a line parallel to the base to an extent equivalent to the extent of opening of the main valve.

have found by extensive tests that the governing or controlling opening in a valve of the character of the present valve 9 is thel area of the opening extending between the edge of the seat 10 and the main valve in a aplane which is parallel to the face of the valve seat. Referring to Fig. 3, let A be the area specied. Then A will equal urz-wb2, which is equal to WW2-b2), where 1' is the radius of the hemispherical portion 11 of the valveand b is the radius ofthe portion within the seat as indicated in Fig. 3. Now by the right triangle Nam, 9"-52 equals m2, where m is the distance be; tween 10 and the front face 'of the lugs 14 which mail( the line of valve closure. Substituting, A equals 11:(m2), whereby we find that the area of the governing opening ofthe main valve is proportional to the square of the displacement of the main valve from the closed position.

Referring now to Fig. 4 where a is the altitude of [a triangular opening or port 24 and c is the base, and considering an opening made by a displacement m from' the apex opposite base c, which is equivalent to a displacement m of the main Valve, the area A ofthe opening will be md, where d is the which d=m' -Now Substituting, A'

base of the opening. Now from will be equal to (57:) (71%). In other to the aforesadapplication in which I cou` ple the valve to a triangular outlet valve of a proportional meter.

It is essential that some stop or positioning means other than a flange on the base, be provided for the valve in order to avoid undue retardation of the flow. Such a means is simply and satisfactorily embodied in the lugs 14 which present, of course, very little obstruction to the flow of waterthe slight eddying effect of which is inappreeiable.

.I claim:

1. In a valve, the combination of a circular valve seat, a spherical-section-shaped valve whose'radius is no greater than the radius of the seat, a base to which said valve is connected, theradius of the base being no greater than the radius of the seat and lugs extending from the base to enga-ge the seat when the valve is in position.

2. In a valve, the combination of a valve seat, a spherical-section-shaped valve whose maximum area is no greater than the area of the seatvand a plurality of lugs connected to the valve and extending therefrom to engage the valve seat when the valve is in closed position.

3. In a valve, the combination of a circular valve seat and a' spherical-section-shaped valve whose area at the base is no greater than the area of the seat whereby no appreciable obstruction is oered to the flow of fluid as it passes the seat. A

4. In a valve, the combination of a circular valve seat and a spherical-section-shaped valve whose area at the base is`no greater than the area of the sea-t and stop means for positioning the valve when closed, said stop means not appreciably obstructing the How of fluid as it passes the seat.

- In testimony whereof, I have hereunto signed my name.

A. B. WOOD. A

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