Zimmermann & Jansen, based in Humble, Texas, is high-temperature, custom-designed valve company that specializes in supplying valves to integrated steel mills, petroleum refineries and the chemical industry. The company has a modern manufacturing facility in Houston where all design, procurement, fabrication, machining, assembly and testing are done. Some of the valves that Zimmermann and Jansen manufacture for steel mills include hot-blast valves, goggle and isolation valves, and two- and three-lever butterfly valves. The valves for refineries include FCCU slide valves, FCCU diverter valves, high-temperature butterfly valves and isolation valves. The company also manufactures a number of chemical valves, such as ethylene transfer line and decoke valves, TIP-ISOM high-cycle valves and MTBE- WWW gate valves.