Patent ID: 7381324
Filing Date: 2008-06-03
Classification: B01D

Abstract:
1. A hydromechanical drive for generating feed movements of strip filter material as a function of prevailing pressure of fluid to be filtered, comprising: a hydraulic accumulator having a movable separating element separating a first accumulator space from a second accumulator space in said accumulator, said first accumulator space being supplied with pressure of fluid to be filtered; an actuating mechanism converting movement of said separating element to a feed movement of strip filter material; and a pressure control generating in said second accumulator space a pressure lower than a pressure affecting movement of said separating element as a function of pressure or extent of fouling of the fluid to be filtered, said pressure control having first and second fluid connections into said second accumulator space, said first fluid connection providing pressure to said second accumulator space less than pressure in said first accumulator space, said second fluid connection providing pressure to said second accumulator space of pressure in said first accumulator space, said pressure control also including a control valve actuated by movement of said separating element to open said first fluid connection and to close said second fluid connection when said separating element is in a first end position and to close said first fluid connection and to open said second fluid connection when said separating element is in an opposite, second end position.