US1894492A

US1894492A - Valve for liquid meters

Info

Publication number: US1894492A
Application number: US501120A
Authority: US
Inventors: Donald H Mcgogy
Original assignee: Individual
Current assignee: Individual
Priority date: 1930-12-09
Filing date: 1930-12-09
Publication date: 1933-01-17
Anticipated expiration: 1950-01-17

Description

Jan. 17, 1933. D. H. MCGOGY VALVE FOR LIQUID METERS Filed Dec. 9. 1930 Patented Jan. 17, 1933 UNITED STATES DONALD H. MCGOGY, MCMINN'VILLE, OREGON VALVE FOR LIQUID METERS Application led December 9, 1930.` Serial No. 501,120.

The present invention relates to valves for liquid meters of the type illustrated in Letters Patent, No. 1,694,747, granted December 11, 1928, and No. 1,814,725, granted July 14, 1931, to my assignee, McGogy Pump Co., Inc. and an application filed January 17, 193.0, Serial No. 421,483. In liquid meters of the stated type, there is provided a body including a central chamber and a plurality of cyl- 0 inders radiating from the central chamber. Pistons reciprocate in the several cylinders and are connected in common to a hollow crank shaft which is disposed centrally in the top of the central chamber Vand is connected to a valve which controls the inow and outflow of the liquid. The inflowing liquid passes to the outer end of a cylinder and then into the cylinder effecting an inward stroke of the piston, while liquid is simultaneously expelled from the alined cylinder by the outward stroke of the connected piston, and during such operation of the pistons, the crank shaft and the valve are rotated so that the inlet and outlet passages will be succes- 5 sively connected with and cut of from the various cylinders. The valve is substantially a disk having an eccentric port which is adapted to aline with the liquid passages successively so as to admit liquid to theres ective cylinders, and also having an arc ed portion adapted to successively connect the various liquid passages with the upper end of the hollow crank shaft so that the liquid expelled from` a cylinder will be directed through the crank shaft to the central chamber of the meter and thence flow to the point of use. The liquid which entered the meter iowed over the top of the valve to reach the eccentric port and the passage alined thereo with and the .pressure of the iniowing liquid was borne by the valve. Under. normal conditions, the pressure above and below the valve was balanced, but if there were a sudden check in the operation of the meter there would be an increase in back pressure under the valve which caused damage to the parts of the meter and affected the accuracy of the readings. This condition has been met by so connecting the valve to the crankshaft that while it will rotate with the shaft it may move upwardly thereon suiciently to relieve the back pressure. It frequently happened that the pressure exerted upon the top of the valve by the inflowing liquid would create excessive friction between the valve and its seat, causing unnecessary head loss and inaccurate measurements. The present invention has Vfor its object the provision of a valve in which the pressure exerted upon the valve will be borne by the crank shaft and the valve may yield to excessive back pressure without caus- 'ing inaccuracy in the reading of the meter.

A valve embodying the invention is illustrated in the accompanying drawing and will be hereinafter fully described, the novel features being particularly defined in the appended claims.

In the drawing:

Figure 1 is a plan view of the valve,

Fig. 2 is a diametrical section` of the same, 70 the position of the bonnet or dome whichcovers the valve and its seat being illustrated by dotted lines, and

Fig. 3 is a view similar to Fig. 2 but 1llustrating a variation in the construction.

In the drawing, the valve is indicated by the reference numeral 1 and it will be seen at once that the valve is a circular member having a port or opening 2 therethrough at one side through which the liquid may flow to enter a cylinder of the meter and at the opposite side being provided with a port or opening 3 through which the liquid may How as it is discharged from the meter cylmders. The valve is connected with the crank shaft 4 in any suitable manner which will cause the valve to rotate with the crank shaft but will permit it to have a slight vertical movement relative tov and independent of the crank shaft, as is shown, for instance, in my said application, Serial No. 421,483, or

it may be splined to the shaft. The crank shaft is hollow so that the outiowing liquid will pass through the port 3 and over the base of the valve into the upper end of the crank shaft and then flow down through the crank shaft to reach the outlet port of the meter. The valve rests upon a seat formed at the top of the central chamber of the water meter and the ports or

openings

2 and 3 of the valve 100 will at times register with the successive passages leading from the bonnet or dome 5 to the outer ends of the cylinders of the meter. The liquid is admitted to the dome 5 and flows over the valve and through the port 2 and such passage as may be at the time in communication with said port to reach and enter the outer end of the corresponding cylinder. The cylinders are connected in pairs so that the pistons in the connected cylinders will Work in unison but in opposition, that is to say, one piston will be moving inwardly in its cylinder to permit the cylinder to fill while the connected piston will be moving outwardly in the corresponding cylinder to force the liquid therefrom. The expelled liquid will pass through the port 3 of the valve and thence into the crank shaft, as has been stated. Heretofore, the valve has been constructed with a dome whereby the outflowing liquid was directed into -the crank shaft, but for the reasons stated this construction was not entirely satisfactory. According to the present invention, a short cylinder 6 is formed on the valve eccentric thereto with the wall of the cylinder at one point merging into the periphery of the valve, the port 2 being at the outer. side of the cylinder and Ithe port 3 being inside the cylinder. Mounted within the cylinder is a piston 7 which is firmly secured on the upper extremity of an extension' 8 of the crank shaft, which.

extension is eccentric to the crank lshaft and concentric to the piston, as shown. The eX- tension 8 is formed at its upper` end with a tenon 9 and the piston 7 is fitted over said tenon to rest on the annular shoulder 11, produced on the extension by the formation of the tenon, and is secured in position by a nut 12 in an obvious manner so as to rotate with the crank shaft. To guard against leakage, a washer 13 may be fitted upon the shoulder 11 of the tenon immediately under the piston and this washer may be of any suitable material. In Fig. 2, the piston 10 is illustrated as having annular grooves 14 in its periphery and in said grooves are seated piston rings 15 whichbear snugly against the inner circumference of the cylinder 6 so that leakage of the liquid past the cylinder will be avoided. The cylindrical wall of the valve may be connected in any convenient manner with an actuating element of the counting mechanism of the meter, a crank shaft 16 having its inner endextending into the port 2 to be carried around thereby being indicated by dotted lines.

In Fig. 3, the piston is illustrated as having a peripheral recess in its lower side in which is fitted a cup washer` 17 which bears against the inner circumference of the cylinder 6 and is clamped in the recess by a ring nut 18 threaded onto the pist-on in an obvious manner. In its upper portion, the periphery of the piston is constructed with an annular recess 19 in which is fitted an expansible coil forming a ring or annulus 20 which bears against the upper edge portion of the cup washer 17 and holds the same firmly against the inner circumference of thecylinder 6 so that leakage will be avoided.

From the foregoing (description, taken in connection with the accompanying drawing, it will be seen that I have provided an eX- ceedingly simple structure whereby an efiicient valve is attained. The pressure formerly applied to the valve by the infiowing liquid is, according to the present invention, received by the piston 7 which is mounted upon the extension of the crank shaft and, therefore, the weight is transmitted to the bearings of the crank shaft instead of being applied to the valve proper and tending to cause the same to bind. Should the back pressure on the valve exceed the pressure exerted above the same by the inflowing liquid, the valve may unseat slightly and nl oved upward with respect to the crank shaftand the piston so as to relieve the pressure and immediately reseat Withoutcausing any leakage of the liquid or any inaccuracy in the measurement indicated by the meter. The valve may be applied to any meter ofthe same general type as that hereinbefore mentioned and operates ina highly efficient manner at all times.

Having thus described the invention, I claim:

1. A circular disk valve for liquid meters adapted to be connected with a4 crank shaft for rotation therewith, said valve having `spaced ports, a cylinder rising eccentrically valve body eccentric thereto and concentric with said extensiomand a piston carried by the extension of the crank shaft and fitting snugly within the cylinder but permitting axial sliding movement of the cylinder.

3. The combination of a -rotatable disk valve provided with diametrically o posite ports, a cylinder rising from the va ve eccentrically thereto and separating said ports, the cylinder at one point merging into `the periphery of the valve, a hollow crank shaft to which the valve is fitted to rotate there-l with, a piston -carried by the crank shaft and fitting snugly within said cylinder to dene a passage for liquid from one port to the end of the crank shaft, and a support extending from the end ofthe crankshaft to which the piston is secured, the cylinder being slidable across the periphery of the piston.

4. The combination of a crank shaft having an extension projectin from its end, a disk valve mounted upon t e crank shaft to rotate therewith and having movement endwise of the shaft, a cylinder rising eccentrically from the valve, a piston secured on said extension and disposed concentrically within the cylinder, and means for sealing the periphery of the piston to the cylinder. 5. The combination of a circular disk valve, a cylinder rising eccentrically therefrom, the valve having a port at the outer 'side of the cylinder and aport within the. cylinder, a piston in the cylinder, means for' sealing the periphery of the piston/io the cylinder, a crank shaft to which the valve is ditted to rotate therewith, and an extension from the crank shaft su porting the piston. In testimony whereof? aix my signature.

DONALD H..MCGOGY. y[1..s.]