US155355A - Improvement in test-valves - Google Patents

Description

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Test-Valves.

Y Patented'Sept.22,1874.

llllllll v IIIIHII UNITED STATES PATENT OEEIOE.

EDWIN A. WOOD, OF UTICA, NEW YORK.

IMPROVEMENT IN TEST-VALVES.

Specification forming part of Letters Patent No. 155,355, dated September 22, 1874; application filed April 20, 1874.

To all whom t may concern:

Be it known that I, EDWIN A. WOOD, of Utica, Oneida county and State of New York, have invented a new Test-Valve for Testing the Accuracy of Steam and Pressure Gages, of which the following is a specification:

My invention is an improvement in gages for testing hydraulic pressure; and consists in a valve lworking vertically on a guide-pin, and having a cavity in its upper side or surface to receive the point Or beak of a yoke by which the testing-weight is suspended, as hereinafter described.

Figure 1 is a perspective view of the testvalve iu its case. Fig. 2 is a side view of the test-valve, a part of the case being broken away. Fig. 3 is a perspective view Of the base, showing the valve-opening. Fig. 4 is a perspective view of the valve.

A is an outer oase. 1n Fig. 2 a part is broken away, as at al, to show the parts within. Through the base of the case passes the pipe a2 for connecting the valvechamber with the pump. B is the valve seat Or base. It

may be in the form of a ring, but I prefer that the upper part should be of a square form, B1, B2, B3, and B4, as seen in Fig. 2, for convenience in calculating its area, which should be One inch square. lts upper edges are knife-edged. It should be made oi' steel, and well hardened, so that the valve may at al1 times t it closely. In the center of the valve opening Or chamber is a steady or guide pin, B5, which extends higher than the valveseat, for the purpose Of holding the valve centrally over the Opening, as seen in Fig. 2. C is the valve, which may be a iiat disk having a hole in its center on the under side O', so that it may be slipped on the steady-pin B5. If the area of the valve-opening is just one inch square, a slit Or groove, B6, should be made, so that the force Of the water-pressure may be applied to the whole area ofthe valve,

which is inclosed by the seat. D is a yoke, whose curved beak or upper end rests in a central cavity Or depression in the upper surface of valve O, as seen in Fig. 1. The yoke is also curved at its lower end to adapt it to suspend a weight, E, and thus a vertical pressure will be exerted on the valve at a point directly over the guide or steady pin B. It hence results that, when the valve G rises, it is in a true perpendicular line or direction, (the yoke and weight being raised with it,) and not in a curve, which would be the case if the pressure due to the weight were exerted through the medium of a horizontal pivoted lever. Thus friction is reduced to a positive minimum, and a corresponding delicacy of test Of hydraulic pressure is secured.

The Operation is as follows: The pipe a? is connected with the force-pump, and the steam or pressure gage to be tested is also attached to the same pump. The yoke D has its upper point placed in the center of the upper surface of the valve, as seen in Fig. l, and a weight, which, with the valve O and yoke D, shall equal the pressure at which the gage is tO be tested, is suspended by its lower end, and, when the force Of the pump exceeds in the slightest degree the said weight, the valve O will rise, and the index on the gage will at the same instant show whether the gage is correct or not, and so by varying the weight the gage may be tested for any required pressure.

I claim as my invention- The combination, with the valve C, resting on a seat, B, working vertically on a central guide-pin, B5, and having a central cavity in its upper side, of the weight-suspending yoke D, with curved ends, all as shown and described, to operate as specified.

E. A. WOOD.

Witnesses:

FRANCIS G. WOOD, MORRIS H. AYLswORTH.

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