Patent ID: 6910493
Filing Date: 2005-06-28
Classification: B60K,F15B,F16D,F16H,Y02T,Y10T

Abstract:
1. Hydraulic control for a chamber fill and drain comprising: a source of pressurized fluid; a fluid trim valve having first, second and third ports, said first port fluidly coupled to a first fluid line, said second port fluidly coupled to a chamber, said third port fluidly coupled to a fluid exhaust line, said valve having first and second positions, said first position effective to fluidly couple said first port to said second port, said second position effective to fluidly couple said second port to said third port; and, a fluid blocking valve having respective first, second and third ports, said first port fluidly coupled to said pressurized fluid source, said second port fluidly coupled to said first fluid line, said third port fluidly coupled to said fluid exhaust line, said valve having first and second positions, said first position effective to fluidly couple said first port to said second port, said second position effective to fluidly couple said second port to said third port; wherein said chamber is supplied with pressurized fluid when the fluid trim and fluid blocking valves are both in respective first positions, said chamber is selectively exhausted of pressurized fluid through the fluid coupling of the second and third ports of the first valve when said fluid trim valve is in the respective second position and the fluid blocking valve is in the respective first position, and said chamber is selectively exhausted of pressurized fluid through the fluid coupling of the second and first ports of the fluid trim valve, the first fluid line, and the second and third ports of the fluid blocking valve when said fluid trim valve is in the respective first position and the fluid blocking valve is in the respective second position.