Greene-Wheelock Valve and Valve Seat Model

This model represents a skeletonized taper plug in which are formed two gridiron valve seats and a bonnet that carried a rockarm collar and cams for actuating one steam and one exhaust valve on the valve seats. The valves are long narrow gridiron valves, which reciprocate in the direction parallel to the axis of the plug. They are actuated by rods and slides and roller cams, which are rock shaft on the collar. The steam valve slide has a disengaging pawl to provide an adjustable cut-off.
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
place made
United States: Massachusetts
Physical Description
nickel plated (overall material)
overall-from catalog card: 3 5/8 in x 5 1/2 in x 1 1/8 in; 9.2075 cm x 13.97 cm x 2.8575 cm
overall: 3 5/8 in x 5 1/2 in x 1 1/8 in; 9.2075 cm x 13.97 cm x 2.8575 cm
ID Number
catalog number
accession number
Credit Line
Gift of Franklin Machine Company, Providence, R. I.
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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