IMPROVEMENT IN OR RELATING TO UREA SYNTHESIZING PROCESS

摘要

Plant components, especially pressure reducing valves, are prone to corrosion and cavitation-induced erosion by high temperature, high pressure and high speed process fluids in the synthesis of urea. To protect such components against attack it is proposed to make them wholly of, or coat them with, corrosion and erosion resistant silicon carbide. In a pressure reducing valve of plug and seat form, the plug tip (4) and seat (5) are protected with silicon carbide.