| 摘要 |
<p>380,012. Speed governors. ISELER, W., (trading as SCHUMANN & CO.), 89, Karl Heinestrasse, Leipsic, Germany. April 7, 1932, No. 10006. Convention date, April 30, 1931. [Class 57.] A regulator for velocity &c. is actuated by fluid pressure (water, oil, air or the like) under the control of an auxiliary device comprising a hollow piston 9 consisting of two parts connected together so as to leave a narrow annular gap 10 from which pressure medium flows in the form of a thin plate-shaped stream opposite a radial cutter 14 so that as the control member moves the flow is directed to one side or the other of an actuating piston 21 coupled to the main valve 4. The Figure shows the application of the invention to a pressure regulating valve. Pressure from the main conduit 1 is led through a pipe 3 to the chamber above a control diaphragm 8 of hardened steel coupled by a lever 30 to the control piston 9. The piston 9 has enlarged parts on each side of the gap co-operating with fixed flanges 17, 18 to form chambers 15, 16 connected by pipes 19, 22 with the chambers 20, 23 above and below the main piston 21. Oil from a pump 5 passes through a conduit 6 to a chamber 24 and thence through ports 13 in the piston to the gap. As the control piston is moved to direct the flow to one side or other of the main piston, flow is permitted between the edges 11, 17 or 12, 18 to the exhaust chamber 27 and thence by pipe 7 back to the pump. In a modification a relay valve is interposed between the control device and the main piston. And in a further modification the control device is mounted within the main valve coaxial with the valve spindle. The narrow annular gap may be replaced by bores, nozzles or slots, arranged in a ring, and the gap may be made stationary and the cutter movable. Two or more gaps may be arranged in the control member.</p> |
