Patent ID: 6860283
Filing Date: 2005-03-01
Classification: B08B,Y10T

Abstract:
1. Method of cleaning heated valves or heated lines through which hydrolyzable polymers are conveyed, which comprises stopping the flow of said polymers through said heated valves or heated lines, emptying said heated valves or heated lines of said polymers, passing steam through said heated valves or heated lines while heating said heated valves or heated lines to maintain the temperature of said heated valves or heated lines within ±10° C. of the temperature to which they were heated during the flow of said polymers through them, said steam being introduced via hydrolysis valves set in the walls of the valve housing of said heated valves or the walls of said heated lines and discharged via emptying apertures, wherein each of said heated valves comprises a heated housing, in the form of a guide cylinder, and is provided with a side steam supply line, a valve piston which can be moved in the axial direction in the guide cylinder, a valve block, which, in the closed position, engages into a valve seat which has an elongated opening cone and is set in the wall of the housing of the valve or line to be cleaned, and a valve block headpiece, which, in the closed valve position, terminates flush with the inside surface of the wall of the housing of the valve or line to be cleaned.