US485438A - Positive proportional water-meter - Google Patents

Description

[No Model.)

. J. THOMSON. POSITIVE PEOPOETIONAL WATER METEE. No. 485,438. `Fafuanecl Nov. l, 1892.

illlllllll IH Nrrsn STATES PATENT Fries.

JOHN THOMSON, OF BROOKLYN, NEW YORK, ASSIGNOR TO THE THOMSON HYDRAULIC COMPANY, OF NEWARK, NEW JERSEY.

POSlTlVE PROPORTINAL WATER-METER.

SPECIFICATION forming part of Letters Patent No. 485,438, dated November 1, 1892.

Application filed July 1, 1892. Serial No. 438.692. (No model.)

To all whom it may concern.-

Be it known that I, JOHN THOMSON, a citizen of the United States, and a resident of Brooklyn, Kings county, New York, have invented certain new and useful Improvements in Positive Proportional Water-Meters, of which the following is a specification.

This is an invention in positive proportional watermeters, the general object of which is to nferentially indicatel a large quantity of fluid by measuring an aliquot part thereof; and the invention particularly relates to certain detail improvements upon my patent of May 31, 1892, No. 476,104.

The figure of the drawing is a vertical central section of the invention. l

The component parts of the device are the measuring mechanism B, (indicated in dotted outline,) the main casing C, the valve D, the valve E, the'plunger F, and stop-nut G.

The water passes from the main inlet-chamber H in two streams, one up through the opening 6, then through the measuring mech* anism to the intermediate chamber I, thence through the port 7, and lnally` to the main Outlet-chamber J. The other stream passes on all sides of the valve-casing direct to and through the ports, as 8, and thence joins the rst stream in the main outlet-chamber. The several said ports are arranged in a single series radially in the valve-casing.v

In the patent herein referred to a spring is employed as a necessary element to the operation of the device. The spring 9 (shown in dotted outline in the accompanying drawing) is similarly disposed; but 4this may or may not be used, according to circumstances. The movement of the valve toward the outletohamber is limited by the nut G, while its movement toward the inlet-chamber is limited by the contact of the end m of the valve against the inclosing head n of the valve-casing. The channel 10 and connecting-openings 11, formed in the plunger, are for the purpose of permitting the free displacement of water to and fro between the chamber Kback of the valve and the main outlet-chamber.

VThe operation is as follows: Under the static conditiomif the spring is employed, the valve will be forced forward until stopped by the nut; but if the spring is not used the valve will simply remain in the position at which it stood at the last rate of flow which passed through the meter. Presuming, however, that thevalve is at the poistion limited by the nut or that ldenoted by the dotted lines P, the delivery will then be through the small forward openings of the ports, which are not covered by the valve, and the valve may remain stationary;` but upon sufficiently increasingV the draft the several radial jets which pass through the ports will directly impinge upon the conical face 13 of the valve, after which the said several jets abruptly change their direction'of ow to a sharp right angle. The consequence of this is that the impact of the jets upon the inclined surface of the valve, together with the reaction of the entire volume after it will have passed the ports, is entirely resisted bythe valve, which when the reactive force is sufficient will be shifted backward, uncovering the ports and compressing the spring, if a spring is ernployed. It will now be seen that concurrent with this action the increase of pressure of the inlet-ohamber over that of the outletchamber will act upon the end of the plunger and that the effect of4 any difference of pressure which may exist between the chambers is to force the plunger and the valve attached thereto forward toward the Imain outlet-chamber. We thus have two opposing forces acting upon the valve-that is, the pressure of the main inlet-chamber, acting upon the head of the plunger to force the valve toward the outlet-chamber and the direct impact and reaction of the discharged volume coacting to force the valve and plunger backward toward the inlet-chamber,which will result in moving the valve back and forth until some position of equilibrium between the opposing forces will have been reached. In such action of the valve the water in chamber K is, as already explained, displaced through the channel formed in the plunger to the main outlet-chamber J, and vice versa when the valve is shifted forward. It ro-l mains to be here pointed out, as in the instance of the patent cited, that the object of limiting the forward movement of the valve to always expose a portion of the port area is to insure the starting of the meter, as with out this provision, should the valve be forced forward sufficiently to entirely lap the ports, the meter would be inoperative and the ilow might be entirely stopped. The advantages that would accrue from employing a spring in connection withrthe device would be to adapt the meter to be used in any position and to increase the difference of pressure between the working chambers at low rates of ow, as it coacts with the pressure upon the plunger, tending to force the valve forward to close the ports. The device, as described, however, is perfectly and positively operative by the combined impact and reaction of the discharge and the diiferences of pressure between the inlet and the outlet chambers. A necessary condition tothe operation of the device is that the area ofl the plunger where it is exposed to the pressureof the main inlet-chamber shall be less than that of the effective area of the valve. The object of this is that the impact of thedischarge and the reaction thereof shall (by. acting upon a greater area than the directpressure upon the plunger) insure that the valve be driven backward for any uniform increase in the rate of discharge.

The dott-ed outline let indicates that the channel l0 maybe extended outward beyond the immediate vicinity of `the planeof reaction, whereby the discharged volume shall by inductive effect tend to make the chamber K negative to the main outlet-chamber J. The stud-screw l5 is to secure the valve-casing in proper relative position.

Vhat I claim is- 1. In combination, the measuring mechanism, the main casing, the valve-casing having a series of radial ports, the valve having an inclined face, the plunger connected to the 4o valve, having its.end exposed to the pressure of the main inlet-chamber, and the displacingchannel to connect the space back of the valve With the outlet-chamber, substantially H as described.

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