Wheelock Valve and Valve Seat Model
date: label: date made
content: 1885
notes: label: Description
content: This is a nicely made model of the valve and valve seat patented by Jerome Wheelock, of Worcester, Massachusetts, September 22, 1885, no. 326820.
label: Description
content: The model represents a wide gridiron slide valve assembled on a skeletonized taper plug, which serves as the valve seat and supports the rock shaft connected to the slide by links or “toggles.” The whole assembly is designed to fit into a taper hole bored into the cylinder block and connected by suitable ports to the cylinder. The advantage of this arrangement over ordinary plug valves is that it does not require that a valve seat be formed within the large cylinder casting, and it permits the delicate fitting of the valve to the valve seat to be performed at a work bench or upon a machine away from the engine.
label: Description
content: The complete Wheelock valve gear (U.S. patent number 326819) consists of one steam valve and one exhaust valve at each end of a cylinder with the rock arms of the exhaust valves permanently connected to the eccentric, so that the valve is at rest during part of the travel of the eccentric, while the steam valves are connected through a detachable latch so that they may be detached and closed quickly at any point during the stroke of the piston.
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: Massachusetts
setName: label: See more items in
content: Work and Industry: Mechanical and Civil Engineering
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content: Bulletin 173
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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
creditLine: label: Credit Line
content: Gift of Franklin Machine Company, Providence, R. I.
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: MC.310251
label: catalog number
content: 310251
label: accession number
content: 108073
objectType: label: Object Name
content: valve with plug
label: Object Name
content: valve with plug, engine steam valve
physicalDescription: label: Physical Description
content: metal (overall material)
label: Measurements
content: overall: 1 1/2 in x 6 1/4 in x 1 1/2 in; 3.81 cm x 15.875 cm x 3.81 cm