Patent ID: 8925584
Filing Date: 2015-01-06
Classification: F15B,Y10T

Abstract:
1. Hydraulic pilot control arrangement for a spool valve, wherein the spool of the spool valve is biased towards a central position, wherein the arrangement comprises a first and a second pilot hydraulic line connected to opposite sides of the spool of the spool valve, pilot pressure regulating means for selectively establishing or removing a pilot pressure in each of the first and second pilot hydraulic lines, a damping device including, a chamber divided into a first and a second pressure compartment by a sliding piston, the first and second pressure compartments being connected respectively to the first and second pilot hydraulic lines, and the piston being biased towards a rest position in the chamber, wherein at least one of the first and second pressure compartments is connected respectively to the first and second pilot hydraulic lines through a secondary unidirectional flow limiter for limiting the flow of hydraulic fluid from the first and/or second hydraulic pilot line to the first and/or second pressure compartment.