Patent ID: 6457782
Filing Date: 2002-10-01
Classification: B60T

Abstract:
An electropneumatic retrofit unit for a pneumatic brake control valve having a pipe bracket and an emergency brake portion and a service brake portion connected to said pipe bracket at first and second faces, said pipe bracket having passages connecting a brake pipe port, a brake cylinder port and an emergency reservoir port to respective interface brake pipe ports, interface brake cylinder ports and interface emergency reservoir ports on said faces, the retrofit unit comprising:an EP interface having an EP brake pipe port, an EP brake cylinder port and EP brake signal port; and an EP emergency reservoir port for mating with said interface brake pipe port, said interface brake cylinder port and said interface emergency reservoir port respectively at either of said faces; an electrical control valve, connected to said EP emergency reservoir port and having a venting port and an output port, for selectively connecting said output port to said venting port for releasing a brake or to said EP emergency reservoir port for applying said brake; and pneumatic isolation valve, responsive to pressure in said EP brake pipe passage, for selectively interconnecting said EP brake signal port and EP brake cylinder port when said EP brake pipe port pressure signals a brake application and connecting said output of said electrical control valve to said EP brake cylinder port when said EP brake pipe port pressure signals a brake release.