Electrically activated park and emergency valve with on-valve manual actuation feature

A park and emergency brake valve comprising:

• a manual park valve having an actuation lever and configured to allow hydraulic fluid to flow through a first manually-controlled channel in response to a first movement of the actuation lever;
• a main valve configured to receive the hydraulic fluid from the first manually-controlled channel and to allow the hydraulic fluid to flow to a braking actuator in response to receiving the hydraulic fluid from the first manually-controlled channel;
• an electrical emergency control valve configured to receive an emergency brake signal and to allow the hydraulic fluid to flow through a first control channel in response to the emergency brake signal indicating a request for emergency braking;
• and
• an emergency enable valve configured to receive the hydraulic fluid from the first control channel of the electrical emergency control valve and to allow the hydraulic fluid to flow to the braking actuator in response to receiving the hydraulic fluid from the electrical emergency control valve.

A park and emergency brake valve comprising:

• a first electrical park valve and a second electrical park valve each configured to receive an electrical park signal and to allow hydraulic fluid to flow through a first electrically-controlled channel in response to the electrical park signal indicating a request to park;
• a first manual park valve and a second manual park valve each having an actuation lever and configured to allow the hydraulic fluid to flow through a first manually-controlled channel in response to a first movement of the actuation lever;
• a first main valve configured to receive the hydraulic fluid from at least one of the first electrically-controlled channel or the first manually-controlled channel and to allow the hydraulic fluid to flow to a braking actuator in response to receiving the hydraulic fluid from the at least one of the first electrically-controlled channel or the first manually-controlled channel;
• an electrical emergency control valve configured to receive an emergency brake signal and to allow the hydraulic fluid to flow through a first control channel in response to the emergency brake signal indicating a request for emergency braking;
• and
• an emergency enable valve configured to receive the hydraulic fluid from the first control channel of the electrical emergency control valve and to allow the hydraulic fluid to flow to the braking actuator in response to receiving the hydraulic fluid from the electrical emergency control valve.