Sequence Valve For A Brake Cylinder Having An Automatic Parking Brake

摘要

A sequencing valve for an automatic parking brake. The sequencing valve has a housing with a first port for communication with a source of a brake pipe pressure, a second port for communication with an exhaust, and a third port for communication with a brake pipe pressure input of an automatic parking brake. A valve body in the housing is moveable to either isolate the brake pipe pressure from the input to the parking brake, or couple brake pipe pressure to the input so that the parking brake may be released. A pilot is interconnected to the valve body for moving the valve body from the first position to the second position and can be driven by a charging and partial release of brake pipe pressure, charging of brake cylinder pressure, or a pneumatic signal provided by an electrical or a pneumatic control valve.

主权项

1. A sequencing valve for an automatic parking brake, comprising:
a housing having a first port for communication with a source of a brake pipe pressure, a second port for communication with an exhaust, and a third port for communication with a brake pipe pressure input of an automatic parking brake; a valve body moveable between a first position, wherein the first port is isolated and the second port and the third port are coupled, and a second position, wherein the second port is isolated and the first port and third port are coupled; a pilot interconnected to the valve body for moving the valve body from the first position to the second position.