IMI plc products

The DC Top Unheading device design is based on our well proven ond multiple used Double Disc Through Conduit Type Gate Valve. Its properties were increased for the higher demand for pressure and frequent tightening performance in the delayed Coker application.

The Bottom Unheading Device is based on our well-proven Double Disc Gate Valve Technology. Its fully automated design ensures safe and reliable DCU unheading operations.

The Bottom Unheading device is based on our well-proven Double Disc Gate Valve Design. Its fully automated compact design is the safest, most robust, and reliable solution for the Delayed Coker Application.

IMI Z&J (Zimmermann & Jansen) supplies various high-quality engineered valves and is a world leader for engineering, design and fabrication of Double Disc Through Conduit (DDTC) Type Gate Valves for use in Ethylene units. To date IMI Z&J has supplied more than 3.000 DDTC Valves all over the world. Our IMI Z&J DDTC valves represent the latest stage of valve technology in Transfer Line Valve (TLV) and Decoking Valve (DV) application and provide a higher safety level than any other type of valve design.

Our isolation valves are based on proven double disc / double isolation valve designs. These valves can be adjusted to meet the requirements of the fluid catalytic cracking process. 

Tight shut-off, high operating temperature, zero jamming and wear free operation. The design provides 100% shut-off of media flow with a total separation of the gas main in the closed position, thus ensuring no passage of the media from the upstream to the downstream gas main, i.e. man-safe isolation.

IMI Z&J introduced the wedge-within-wedge gate valve to the market and we have more than 60 years of experience in the industry. lts design is most suitable for extreme operating conditions of high temperature, high pressure, line stresses and high frequency of operation.

The design provides 100% shut-off of media flow with a total separation of the gas main in closed position. For clean and crude gases. Enclosed or open design with a variety of installation positions (vertical, horizontal, swing type).

This shut-off and safety valve for gaseous media includes a centrally positioned guide lever to control plate movement.