| 摘要 |
1448465 Discharging sludge from centrifuge WESTFALIA SEPARATOR AG 14 Nov 1973 [27 Dec 1972] 52939/73 Heading B2P A centrifuge drum has a slidable piston valve 3 which defines a separating chamber at one side, and a hood 2 which overlies the central portion 3b of the piston valve which is sealingly guided with respect to the hood by an axial projection 3a and a sealing ring 4, the hood forming with the piston valve a control chamber 6 which can be supplied with control fluid to control movement of the piston valve, the control chamber being connected at its radially outer end with a passage 10, 10a passing through the piston valve and extending to the outside of the drum and at its radially inner end with a feed device 7, 8, 9 for the control fluid. As shown the hood 2 is formed by the base of a feed distributor 1, 2 for material to be centrifuged. During centrifuging the chamber 6 is empty and the piston valve 3 is maintained in its closed position by the pressure exerted by control fluid introduced into a chamber 5 in the lower part of the drum, this pressure being greater than that of the drum contents which acts in the opening sense only on the radially outer portion of the piston valve. For discharging the drum, the supply of control fluid to the chamber 5 is shut off and that chamber is drained by opening a valve 12. Simultaneously control fluid is introduced into the chamber 6 through the device 7, 8, 9 so that the opening force on the piston valve is increased and the process of opening the drum is speeded up. Specification 1308265 is referred to. |
