Carhart Balanced Valve, Patent Model
date: label: date made
content: 1866
label: patent date
content: 1866-03-27
name: label: inventor
content: Carhart, John W.
notes: label: Description
content: 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.
label: Description
content: 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.
label: Description
content: Reference:
label: Description
content: 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.
label: Location
content: Currently not on view
place: label: place made
content: United States: New York, Troy
label: associated place
content: United States: New York, Troy
setName: label: See more items in
content: Work and Industry: Mechanical and Civil Engineering
label: See more items in
content: Bulletin 173
label: See more items in
content: Engineering, Building, and Architecture
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content: Work
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content: Industry & Manufacturing
publisher: label: Related Publication
content: Frank A. Taylor. Catalog of the Mechanical Collections of the Division of Engineering United States National Museum, Bulletin 173
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: ER.308671
label: accession number
content: 89797
label: catalog number
content: 308671
label: patent number
content: 53,410
objectType: label: Object Name
content: balance valve, model
label: Object Name
content: patent model, valve, steam engine
label: Object Type
content: Patent Model
physicalDescription: label: Physical Description
content: brass (overall material)
label: Physical Description
content: wood (overall material)
label: Measurements
content: valve - from catalog card: 2 1/2 in x 6 in; 6.35 cm x 15.24 cm
label: Measurements
content: overall: 3 3/4 in x 6 in x 2 1/4 in; 9.525 cm x 15.24 cm x 5.715 cm