DE3140080

An inshot valve device for use with railway brake apparatus of the type employing a brake cylinder in which the chambers formed on opposite sides of the brake cylinder piston serve as storage reservoirs. Braking force is obtained by the venting of air from the storage reservoir chamber on one side of the brake cylinder piston following movement of the piston to brake application position, so that the storage reservoir chamber from which air is vented is reduced to a minimum to conserve air. During an emergency brake application, the air from this storage reservoir chamber is vented via the inshot valve device, which controls the emergency buildup of brake forces in accordance with a predetermined brake force profile. The inshot valve device controls the emergency brake force buildup to follow this predetermined profile irrespective of different brake pipe charges or different service brake applications that may exist at the time of the emergency.