| 摘要 |
<p>Tractor protection valve, means for use in the air brake system of a tractor-trailer vehicle combination to protect and maintain the braking system of the, tractor includes a pair of valve housings. One of the valve housings (the pilot) is attached to the tractor dash control valve and includes a piston controlling communication between an inlet, 2 delivery port and an exhaust port. The second housing has a tractor supply port connected to the pilot delivery port, in addition to trailer supply and control ports, a tractor control port, and an exhaust port. The pilot valve attached to the dash control valve contains the control portions of the valve combination with the piston in the other housing being movable in response to air pressure supplied from the pilot to control communications between all of the ports connected thereto.</p> |
