| 摘要 |
<p>An electropneumatic brake control valve unit capable of operating at the interface of the emergency brake portion (20) or the service brake portion (10) of a standard brake control valve as a retrofit unit (40) or operating as a stand alone electropneumatic unit. The unit includes electric valves responsive to electrical signals and sensed brake pipe pressures to operate pneumatic valves to control the brake cylinder. The pneumatic valves are also operable independent of the electric control valves so as to allow braking with the electrical controls off or disables. The unit can operate in combination with a complete brake control valve or with either or none of its emergency and service portions.</p> |
