Mechanical movements, powers and devices; a treatise describing mechanical movements and devices used in construcive and operative mechinery and the mechanical arts, being practically a mechanical dictionary (1917)
Hiscox, Gardner Dexter, 1822?-1908 · New York : The Norman W. Henley publishing co. · leaf 78
238. SINGLE D SLIDE VALVE,with lap. The length of the valve overthe length from outside to outside ofsteam ports is double the lap. … 239. BALANCED SLIDE VALVE.—A ring in a recess of the valve rides againstthe steam chest cover, held by a spring. 72 STEAM POWER.
Mechanical movements
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