US Patent: 1,285,475
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| Automatic exhaust-valve
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Patentee:
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| Wolfgang Turnwald (exact or similar names) - Syracuse, Onondaga County, NY |
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Patent Dates:
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| Applied: |
Dec. 15, 1915 |
| Granted: |
Nov. 19, 1918 |
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Joel Havens
"Vintage Machinery" entry for Mesta Machine Co.
"Vintage Machinery" entry for Ridgway Dynamo & Engine Co.
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Description: |
| In the Stumpf Una-Flow Engine design, steam enters from either end of the cylinder, and the exhaust is at the mid-line of the cylinder. Steam enters alternately at either end of the cylinder. This interesting design was problematic in practice. For one thing, the cylinder experienced a temperature gradient, cool at the center and hotter and either end, which required the cylinder to be made with a slight taper to compensate. As well, the engine moved quickly, which stressed the valves and required the engine to be heavily built to withstand the stresses.
A 1922 condensed catalog from Ridgway Dynamo & Engine Co. lists "Unaflow Engine: Built under Stumpf patents. Steam jacketed heads, poppet valves and extremely simple valve gear. Bed, governor and reciprocating parts same as on Single Valve Engine. Recommended for high pressures, high superheat, and condensing service. Sizes 100 H.P. to 800 H.P." |
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