Patent ID: 6325464
Filing Date: 2001-12-04
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 said faces, the retrofit unit comprising:a plate for mounting at and sealing said first face; anda unit for mounting at said second face and includingan electrical control valve, connected to said passage for said emergency reservoir port, a venting port and an output port when said unit is mounted, for selectively connecting said output port to said venting port for releasing a brake or to said emergency passage for applying said brake, anda pneumatic emergency valve, responsive to pressure in said passage for said brake pipe, for selectively connecting said passage of said brake cylinder port with said passage of said emergency reservoir port in response to an emergency signal in said brake pipe port passage and connecting said brake cylinder port passage with said output of said electrical control valve in absence of said emergency signal in said brake pipe port passage, when said unit is mounted.