US145369A - Improvement in low-water indicators - Google Patents

Description

F. STEELE.

Low-Water Indicators.

Patented Dec.. 9,11873."

UNITED STATES PATENT CEEIOE.

` FERDINAND sTEELE, OE BROOKLYN, 'NEW YORK, AssIGNoR To AMERICAN STEAM AND WATER RECORDING COMPANY, OF SAME PLACE.

IMPROVEMENT IN LOW-WATER INDICATORS.

Specification forming part of Letters Patent No. 145,369, dated December 9, 1873; application filed May 14, 1873.

' To all whom it may concern:

the lower end, in which the water remains, ex-

cept when the water in the boiler sinks below the end of suoli pipe,1 and allows steam to enter and take the place of the water, and produce an expansion and alarm. In most instances the expansion-rod has Opened the valve to the alarm-whistle by an end wise thrust; hence such rod has been of necessity of a large size, and not intluenced rapidly by changes of temperature.

The object of my invention is to apply tension to the expansion-rod, and to cause the pressure of the steam in the boiler to open the y'alve to the whistle, thus relieving the expansion-rod from all duty, except that of controlling, by tension, the opening and closing of the valve to the whistle, that is nearly balanced vby the pressure of the steam on a diaphragm, thereby rendering the alarm more durable and reliable in its operation.

In the drawing my improvement is represented by a vertical section. .A

The plate a represents a portion of the boiler, and the pipe bis to extend to the water-line at the lowest level, and its upper end is connected in any convenient manner with the .tube c, containing the expansionrod d. This rod d is secured by a bridge, e, at the lower end, and at the upper end passes through the flexible diaphragm f, the edges of which are confined by the ring or frame g. The lever 7L is upon a fulcrum, I, and extends above the expansionrod d to tliestem of the valve This valvei is in a pipe that connects on one side at m with the boiler, and at the other side a with the whistle or alarm o, and there is an adjusting screw or plug, p, at the end of the lever h.

The size of the valve i, in comparison to the area of the diaphragm j', is suoli that the pressure of steam or water upon the diaphragm f, acting through the lever It, is sufficient to Open the valve 'i against the pressure of steam; hence the expansion-rod d will always be under tension, and its duty will only be to allow the pressure of iiuid in the boiler to move the diaphragm in opening the valve'i by the superior area of pressure, or to contract by decrease of temperature suttieiently to allow the valve t' to close by the pressure of steam. be added to the valve t' to aid in closing the same., A tube may bc substituted for the rod d, the action being the same.

I claim as my invention- 1. The diaphragm j' and expansion rod or tube d, in combination with the tube c and alarm or whistle, substantially as set forth.

2. The diaphragm j', expansion rod 0r tube d, lever h, and an adjustment, p, in combination with the tube c and alarm ot a low-water indicator, substantially as set forth.

3. The expansion-rod d and diaphragm j', in combination with the lever h, valve t', and alarm and steam and water tubes, substan tially as andfor the purposes set forth.

Signed by me this 8th day of May, A. D. 1873.

FERDINAND STEELE.

Titnesses GEO. T. PINOKNEY, CHAs. H. SMITH.

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