PNEUMATIC PRESSURE CONTROL DEVICE FOR AN EMPTY/LOAD CHANGEOVER VALVE ON A RAILWAY CAR

摘要

A pneumatic pressure control device for an empty/load changeover valve on a railway car, which enables an empty/load changeover valve to have a lower profile. The pneumatic pressure control device comprises a mounting member having a first surface, a second surface, and further having an actuating push rod. A sensor arm of a predetermined size and shape has a first end and a second end. A first means disposed adjacent at least one of the first surface and the second surface of the mounting member pivotally supports the sensor arm in a predetermined position on the mounting member. A second means is engageable with the sensor arm and the actuating push rod on the mounting member for moving the push rod in response to a movement of the sensor arm. A load sensing means has at least a portion thereof disposed on the second end of the sensor arm for determining a rate of brake cylinder pressure required relative to an actual weight of a railway car. The sensor arm and the load sensing means have a predetermined travel limit.