Product Representation
IMI Z&J have been a manufacturer of large diameter valves for more than 135 years, with thousands of double disc installations worldwide in severe refining and petrochemical applications such as Fluidised Catalytic Cracking, Ethylene and since 2004 Delayed Coking.
Their deep expertise and experience of the Delayed Coking process has ensured that we have designed the most robust, safe and cost-effective solution for this complex and challenging application. The double discs provide the highest safety level of any design. Compared to a single gate valve a double disc valve offers the advantage of ultra-low steam consumption and longer lifetime. This makes the double disc design not only the safest but also the most cost-effective plant life solution for automatic coke drum unheading.
Within the ethylene process heaters provide the cracking of hydro-carbons by means of hot steam. These heaters (steam crackers) suffer from a phenomenon where deposits of ‘coke’ accrue on the pipework and valves. From time to time these deposits must be removed (‘decoking’), ideally without shutting down the process completely. This is where their valves excel.
Product Brochures
Product Brochure – IMI Z&J Delayed Cooking Bottom Unheading
Delayed Coking
Ethylene Transfer Line and Docking Valves
Fluidised Catalytic Cracking Unit Fractionator Isolation Valves
Isolation Valve
- Two independent discs – limited thermal distortion, less steam and less erosion
- Two independent discs – true double block and Purge performance
- Active mechanical seating force for high tightness
- Corrosion and wear resistant hard-faced seats
- Guided carrier between two plates preventing coke fines in valve body
- No cooling water required
- Easy inspection of upper seat & disc
- Minimal spare parts
- 100% actuator redundancy
- Actuator options: Electric or Hydraulic
- Low potential for hydrocarbons escaping to the atmosphere
- True double block & purge performance within one valve body by means of two independent, separate shut-off discs (independent closure elements). Proven under critical/severe service conditions
- Active, controlled and constant mechanical seating force when closed due to the central split-wedge-ball device
- safe and reliable tight shut-off
- Flat or round body valve design
- Mounting options: flanges or welding ends
- With reduced or full-bore passage
- Long-lasting metal-to-metal seats, corrosion and wear resistant
- Smooth tubular passage ln the open position (valve body free of solid particles)
- Can be installed in any orientation
- Designed to customer specifications and German or International standards
- Accommodates any desired type of actuator
- Materials selected to suit operating conditions
- Specially developed technique for crackfree hard-surfacing of the seats of ensures long-term maintenance-free service
- Double-Block and Purge shut-off (offers the same functionality like a blind flange)
- Internal components kept clean of medium
- Seats protected, in both the open and closed positions, from erosion and coking medium
- Mounting orientation flexibility – horizontal, vertical, etc
- Stiff valve body protects against line loads
- Sizes from 6″ to 100″
- Line Connections can be welded-in or flanged w/ blanking system
- Material specifications dictated by design and operating conditions
- Double disc design available as:
- double block and purge
- double block and bleed
- Metal to metal seating
- Rising stem (O&Y type)
- Round, oval or flat valve designs available
- With flanges or butt-weld ends