| 摘要 |
<p>A railway car control valve comprises a brake pipe port, an auxiliary reservoir port, a main piston, intermediate the brake pipe port and the auxiliary reservoir port, configured to compare an air pressure supplied at the brake pipe port with an air pressure supplied at the auxiliary reservoir port and a one-way check valve positioned intermediate the brake pipe port and the auxiliary reservoir port. The one way check valve comprises a body having a first end, a second end, and a bore extending from the first end to the second end, an elongated insert defining an outer surface, the insert configured to reduce the rate of air flow through the body, and sleeve received on the insert outer surface. The insert is received in the body bore. One of the insert and the sleeve is configured to move between a first position that allows air to flow in a first direction from the brake pipe port to the auxiliary reservoir, and a second position that prevents air from flowing in a second direction from the auxiliary reservoir port to the brake pipe port.</p> |
