Patent ID: 8806863

Claim:
A hydraulic transmission control unit comprising: at least one pressure regulation valve ( 1 ) and at least one pilot control valve ( 2 ) which is connected, via a pilot control line ( 35 ), to the at least one pressure regulation valve ( 1 ); a pre-filling valve ( 3 , 303 ) for adjusting a first pre-filling pressure (p_ 3 ) to prevent draining of a clutch ( 20 ) and pressure lines ( 231 , 331 ) connected to the pre-filling valve ( 3 , 303 ) when the clutch ( 20 ) is not-actuated; and the pilot control line ( 35 ) being connected to at least one other line ( 236 ′, 238 , 336 , 338 ) which is under a second pre-filling pressure (p_ 3 ′) such that draining of the pilot control line ( 35 ), when the clutch ( 20 ) is not actuated, is prevented.