Frost Steam Pump, Patent Model

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This model was submitted to the U.S. Patent Office with the application for the patent issued to Richard L. Frost, of Battle Creek, Michigan, February 11, 1890, no. 421355. The patent was assigned to the Union Manufacturing Co. of the same place.
The model represents a section through the steam cylinder, piston, and steam valve of a direct-connected steam water pump. The valve is a steam-actuated piston valve so designed that an increase in the exhaust pressure cannot act on the valve as to entirely close the live-steam port and stop the engine.
The valve is a piston slide valve that admits live steam at its ends through a hollow section to the cylinder steam ports close to the middle of the valve. The exhaust is to the center. Formed on the ends of the piston valve are enlarged pistons which closely fit cylinders provided for them. Ports in these cylinders are so connected to the main cylinder ports and the main cylinder that pressure on one end serves practically to balance the valve, while pressure on the other end actuates the valve. The main piston is relatively long and has an annular depression between its two ends. The space thus formed between the piston ends and the cylinder in combination with ports in the cylinder acts to supply steam to the valve cylinder to actuate the valve.
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.
Currently not on view
date made
patent date
Frost, Richard L.
place made
United States: Michigan, Battle Creek
associated place
United States: Michigan, Battle Creek
Physical Description
iron (overall material)
overall: 7 3/4 in x 14 1/8 in x 6 3/4 in; 19.685 cm x 35.8775 cm x 17.145 cm
ID Number
catalog number
accession number
patent number
See more items in
Work and Industry: Mechanical and Civil Engineering
Industry & Manufacturing
Bulletin 173
Engineering, Building, and Architecture
Data Source
National Museum of American History


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