CHANGE-OVER VALVE, PREFERABLY FOR A RAILWAY VEHICLE

摘要

This invention relates to a change-over valve (or a so called empty-load valve), preferably for a railway vehicle, having a valve device opening or closing a pneumatic passageway depending on the position of a mechanical operating system or in other words the load on the vehicle. In order to improve the working range of the external operating arm and the exactness of the changeover point the operating system is a force transmitting chain from said operating arm to the valve device via a spring, a knee lever and a valve operating rod in such a geometrical way that the axis of the spring is substantially perpendicular to the valve operating rod.