Coking Isolation Valves
Improve up-time. Decrease production losses.
The delayed coker process is a batch process, one of the most hostile environments in the refinery – due to the abrasive and erosive fouling properties of the coke by-product.The valves also experience extreme thermal cycling. Valves are cycled frequently and failure can lead to a complete shutdown of a unit, resulting in large process and financial costs.
ASME / ANSI Class 300 – 2500
Standard materials: For SP valves: A217 Gr. C12, A217 Gr. C5
For heater isolation valves: A217 Gr. C12, Incoloy® 800 H, 317SS
End connections: flanged
Absolute zero-leakage shutoff
- Integral seat design
- Zero to ANSI class VI shutoff
- Mechanical (Belleville® spring) ball to seat loading
- Fire safe per API 607 6th edition
- Single steam connection point option
- Separate ball and stem to prevent packing leaks through daily temperature cycles
- Low steam purge consumption
- The sealing surfaces are overlaid with tungsten or chromium carbide cermets using our exclusive HVOF RiTech® process
- Continuous steam purging/flushing to eliminating coke buildup in between shutdown intervals
- Low steam purge consumption
- Full bore design
- Bi-directional design available for special services
- Live-loaded fugitive emission stem packing
- Robust, true severe service design, with fewer parts – only eight mechanical components in valve design
- Integral seat. Benefit: Most effective technology for thermal cycling and solids containing processes. This design extends drum switching isolation for scheduled production operations and goals.
- Inconel forged Belleville spring. Benefit: Delivers process isolation due to consistent ball and seat loading, especially for solids conditions. Eliminates costly bellow type designs, reducing cost of repair due to protection of ball and seat contact points, helping manage turnaround costs.
- HVOF RiTech® hard coatings. Benefit: State-of-the-art computerized applied hard coatings on ball and seat extending isolation capabilities for expected operational performance goals and repair cost reductions
- Continuous purge design. Benefit: This design ensures consistent torques for drum operations to meet production run times. Provides consistent valve operation due to effective flushing of hot resid and fines collection.
- Reduced steam consumption. Benefit: Reduces total cost of ownership versus other ball valve designs in reducing yearly steam costs
- Bi-directional sealing option. Benefit: Provides isolation of process in both flow directions due to fluctuating pressures
- Spring loaded low emission packing design. Benefit: Keeps hydrocarbon in containment and meets 100 PPM requirements
- ValvTechnologies’ repair services. Benefit: Capabilities to service/repair ValvTechnologies’ coker valves on-site or at our manufacturing facility in Houston, Texas
Stem design is a true blowout-proof design where the stem is introduced into the valve body through the ball opening and is retained by an integrally-machined shoulder. No pins or collars are used in the retention of the stem.
Additional options per customer specification:
- Automation – electric, hydraulic, pneumatic
- Interlock control capabilities
- Switch valve
- Drum overhead vapor line
- Feed and withdrawal lines
- Drum blowdown
- Heater isolation
- Cutting water isolation
- Switch valve isolation
- Safety relief valves isolation lines
- Drain and vent valves
- Fractionator isolation valves
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