| 摘要 |
FIELD: engineering industry. ^ SUBSTANCE: invention refers to engineering industry and is meant for being used as a drive in pipeline shutoff-and-control valves. Double-speed manual drive of pipeline valves consists of a planetary gear located in a casing with a cover, a hand wheel and a speed switch. Outlet sun gear is fixed on the shaft. Shaft is connected with displacement mechanism of valve shutoff element. Cover of planetary gear casing is installed in the casing so that it can rotate. Hand wheel is rigidly fixed thereon. Switch is located on the cover so that it can come into contact either with sun gear shaft of planetary gear, or with its carrier through a slot provided in the cover. ^ EFFECT: improving the adjustment accuracy of control element, simplifying the design, decreasing the time required for valve control, improving reliability, and providing serviceability of manual drive. ^ 2 cl, 2 dwg |
