FLOATING VENT FOR RAILWAY TANK CAR SAFETY RELIEVE VALVE

摘要

A railway tank car for the transport of liquids has a safety relief valve which is actuated at a predetermined pressure. A float on the outer end of a flexible conduit which communicates with the relief valve permits the flexible conduit to be exposed to gases in the void volume of the tank even when the tank is overturned and the safety valve is on the bottom of the tank shell instead of the top of the tank shell. Excessive gaseous pressures in the tank shell which might occur upon derailments with the tank shell tilted or overturned is communicated or vented directly to the safety relief valve by the end of the flexible conduit which is exposed to the void volume of the tank shell.