Retaining valve for a rail car brake system
Number of patents in Portfolio can not be more than 2000
United States of America
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Sep 24, 2019
Grant Date -
Nov 29, 2018
app pub date -
May 26, 2017
filing date -
May 26, 2017
priority date (Note) -
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status (Latency Note)
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Abstract
A retaining valve includes an inlet and a valve member downstream from the inlet, wherein the valve member has first, second, and third positions. A first passage through the valve member allows fluid flow through the retaining valve when the valve member is in the first position. A second passage through the valve member allows fluid flow through the retaining valve when the valve member is in the second position. A third passage through the valve member allows fluid flow through the retaining valve when the valve member is in the third position. A slide moves with respect to the valve member in response to pressure at the inlet. A spring engaged with the slide biases the slide toward the inlet. A seal located at an axial midpoint of the slide prevents flow through the third passage when pressure at the inlet is less than a predetermined pressure.
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