Patent ID: 6561221
Filing Date: 2003-05-13
Classification: F15B,Y10S,Y10T

Abstract:
A control device for separately and independently controlling two flows of pressure medium to a working cylinder, said control device comprising:a housing which defines first and second opposite ends, a passageway therethrough, first and second pressure medium inlet connections, first and second pressure medium outlet connections, a pressure medium discharge connection, and a first and second pressure chambers located at said opposite ends, first and second independently movable adjustment elements which are located in said passageway and always define a gap therebetween to assure independent movement thereof, there being no mechanical means attaching said first and second adjustment elements together across said gap, said first and second adjustment elements defining fluid passageways therethrough to communicate said respective first and second pressure chambers with each other and a prestressed check valve for controlling pressure medium flow from said first and second pressure medium chambers to said pressure discharge connection, said first and second pressure chambers becoming pressurized with pressure medium leaking past said respective first and second adjustment elements, each of said first and second adjustment elements defining two control edges which respectively and independently control flow of medium inlet connections to said first and second pressure medium inlet connections to said first and second pressure medium outlet connections depending on independent axial positioning thereof within said housing, and first and second drive means at said first and second ends of said housing respectively connected to said first and second adjustment elements to control movement thereof within said housing independently of one another.