Carhart Balanced Valve, Patent Model

This model was submitted to the U.S. Patent Office with the application for the patent issued to John W. Carhart, of Troy, New York, March 27, 1866, no. 53410.

The model represents a conical plug valve with an annular exhaust space between the plug and the valve and a steam passage through the hollow core of the plug. The peculiar feature of the valve is the provision of recessed annular spaces in the valve, which, with the valve seat, form small pistons and cylinders designed to balance the valve longitudinally when connected to the steam passages. Screw adjustments on the valve stem and the small end of the valve are provided for setting the valve in a position giving proper contact with the minimum of friction.

Reference:

This description comes from the 1939 Catalog of the Mechanical Collections of the Division of Engineering United States Museum Bulletin 173 by Frank A. Taylor.

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