Method and apparatus for freeing a railroad tank car bottom unloading valve made inoperable by solidified fluids within it

Claim 1

A portable steamless heating apparatus for use with a bottom unloading valve of a railroad tank car, said valve having a central vertical fluid passageway for the unloading of liquids transported in said tank car and a stop member movable to open and close said passageway through which liquids are unloaded, said valve being manually inoperable due to solidification of liquids in said fluid passageway and said stop member, said valve further including a lever for manual operation of the valve and said fluid passageway terminating in a flange member having a central opening forming an axial extension of said fluid passageway, and an external flange member for connecting flow from said valve to a fluid unloading system, said heating apparatus comprising: an elongated cylindrical electrical heating unit axially insertable through said central opening in said flange member into said fluid passageway of said valve, one end of said unit being adapted to contact said stop member so as to be in direct heat transmitting relationship with said fluid passageway of said valve when a heating element of said heating unit is energized to liquefy solidified fluid which may be contained therein to make said stop member of said valve operable; an externally threaded tubular member having an opening therethrough surrounding the other end of said heating unit for threadably securing said unit to said flange member, a cap member having an opening therein slidably engaging the cylindrical surface of said heating unit, said cap member joined to the external end of said tubular member forming a closure for the external end of said tubular member, retaining means mounted on said cap member for slidably holding said heating unit in said tubular member so that said one end of said heating unit is adjustably positionable relative to said stop member of said valve; drain means formed in said cap member for draining the fluid from said valve passageway and around said heating unit, and electrical power control means mounted on said other end of said heating unit for regulating the heat output of said heating unit to liquefy said solidified fluid, said control means including means for electrically connecting the heater element of said heating unit to an external source of electrical power.