US1626038A - Alloy - Google Patents

Description

Patented Apr. 26, 1927.

UNITED STATES PATENT OFFICE.

WARD S. IRELAND, OF BELOIT, WISCONSIN, ASSIGNOR TO LI PMAN REFRIGERATION COMPANY, OF BELOIT, WISCONSIN, A CORPORATION OF DELAWARE.

ALLOY.

No Drawing.

This invention relates in general to alloys and has for its primary purpose the production of a new and improved alloy, particularly suitable for the manufacture of valve seats, valve discs, and the like.

In some types of fluid control apparatus, such as mechanical refrigeration systems, for instance, an extremely tight and leakproof fit between a valve and its seat is essential to successful operation. The grinding and lapping of valves and their seats together is not only a tedious and expenslve operation, but it is extremely diflicult to obtain an absolutely accurate fit. Furthermore, minute particles of hard sediment or other foreign matter lodging on the seat will preclude complete closure of the valve, with the result that leakage will occur.

In order to eliminate the expense and other disadvantages of grinding and lapping I valves and seats in an effort to attain a leakproof fit, I have devised my present invention, which when used as a valve seat, for instance, produces a seat which issufliciently soft so that when the valve is forced against it underextremely high pressure, the metal of the seat will How to a limited extent sufficiently to conform to and assume the exact shape of the valve which is being pressed into it. In this manner, an absolutely accurate fit between the valve and seat is secured.

The alloy, however, is sufficiently stiff or rigid so that it will not further flew, distort,

or be subject to deformation under the ordinary working pressures of the valve. Consequently, any likelihood of the metal of the seat flowing so as to close the aperture in the seat is obviated.

In addition to its characteristic of semirigidity above explained, the seat formed of my improved alloy is suiiiciently soft so that hard particles of grit. sediment, or other foreign matter which may lodge on the seat v will not hold the valve away from the seat so as to cause leakage, but if the foreign particle is too hard to be crushed between the valve and the seat under the ordinary working pressures exerted by the valve against the seat, the hard particle will be forced into the body of the seat itself, and

Application filed January 29, 1926. Serial No. 84,559.

embedded therein so as to permit a complete leak-tight closure of the Valve against the seat.

"With these desiderata, ofsufiicient soft For the particular purpose above mentioned, as. illustrative of one use of my invention, I prefer to employ 96 tin and 3-{,%'silver, but comparatively satisfactory results may be attained with some variations of these proportions, anywhere between 95 and 97 70 tin and 5 and 2 silver.

The two metals are thoroughly mixed together in molten condition until a homogeneous composition or-mixture is attained,

whereupon the resultant alloy may be cast in any desired'shape, may be machined, or

otherwise worked, should occasion demand.

'VVhile I have described the preferred proportions of the materials com rised in my novel alloy, it should be un erstood'that some latitude of variation in these proportions is contemplated within the scope of my mvcntion as defined in the following claims.

I claim:

1. An alloy consisting of the following ingredients in substantially the proportions specified: Tin, 95 to: 97 70, and silver, 2 to 5%. i

. 2. An alloy consisting of tin and silver in the proportions of 27 parts of tin to one part of silver.

In witness of the foregoing I afiix my signature.

WARD S. IRELAND.