Z&J offers complete solutions for Delayed Coking Units.

The systems are manufactured in Double Disc Design and available as:

• Bottom Unheading Valves
• Top Unheading Valves
• Inlet Isolation Valves
• Quench and Blowdown Valves

Patented and Patented Design

• Real double block and purge performance within one valve body due to two independent discs. 
• Active mechanical sealing force due to central split-wedge-ball arrangement. 
• Corrosion and wear resistant hard facing overlay on the seats; no adjustment and replacement of seats required.
• No deposits of solid particles in valve body due to valve gates guided between guide plates. 
• All wear parts can be easily removed when the valve is in maintenance position.
• The sealing surfaces are completely covered in each gate end position. Depositing within the valve and on the seats is avoided.
• Disc carrier equipped with tube to provide throughway in open position.
• Purge steam connection for continuous valve body and seat purge.
• Minimum purge consumption due to reliable metal seating even under hot oil in situation.
• Emergency manual operation integrated.
• Extremely low purge steam consumption.

• During deheading/unheading no personnel are required on deck due to fully remote operation. 
• Real double block and purge due to two independent discs. Highly reliable sealing even during hot oil in phase. 
• No spillage of coke or drum water onto the unheading deck due to fixed oultlet shute below the valve.

• Well proven patented design used in other severe services such as ethylene, FCCU, phosgen, etc. 
• The design assures long term operation. Clogging of coke chunks, residue or any other foreign matters are avoided.
• The actuator is well over designed to assure 100% opearbility in open as well as closed position, even in most severe situations.
• Field service is extremely easy and can be done in very short timing.
• Coke feed lines remain mounted.
• No gasket changing is necessary after each drum cycle like during manual unheading.
• Drum water dainage through the open valve can be configured.