Relay valve assembly
AssigneeGeneral Signal Corporation
InventorRonald O. Newton
Life of this patent
Estimating the term…
Abstract
A fluid system for the rail brake cylinder of a highway/rail vehicle including a control valve responsive to brake pipe pressure drops to provide a control signal to a variable load relay valve assembly which provides brake cylinder pressures. The relay valve assembly maintains the rail brakes deactivated in the highway mode, provides braking pressure independent of the variable load portion for low pressure in the control valve's auxiliary reservoir, maintains a rail reservoir and rail suspension supply changed from the highway and rail supply lines, and creates an emergency condition in the brake pipe for low rail supply line and or rail reservoir pressure.
Claims9
In a vehicle having rail wheels, road wheels, a brake system for said rail wheels including a rail brake cylinder and a fluid brake control system, the improvement being said brake control system which comprises:
- a rail brake control pipe for transmitting rail brake signals;
- control valve means responsive to brake signal changes of pressure in said brake control pipe to provide control signals;
- rail supply line to be charged during rail use;
- highway supply line separate and distinct from said rail supply line to be charged during highway use;
- and
- relay valve means responsive to said control signal for governing the flow of fluid from said rail supply line to said rail brake cylinder and responsive to the presence of a predetermined pressure in said highway supply line for maintaining said rail brake cylinder deactivated.
Dependencies are inferred from the claim text.