product

Coking Isolation Valves

Technical Data

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Sizes

6 – 42”

Pressure Classes

ASME / ANSI Class 300 – 2500

Materials of Construction

Standard materials: For SP valves: A217 Gr. C12, A217 Gr. C5
For heater isolation valves: A217 Gr. C12, Incoloy® 800 H, 317SS

End Connections

End connections: flanged

Shutoff

Absolute zero-leakage shutoff

Increase your overall mean-time between repair/failure hours with ValvTechnologies’ coker valves

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.

Improve up-time, avoid unscheduled downtime and lost production with ValvTechnologies’ coking solution.

Reliability and longevity
Operational and personal safety – reliability of tight isolation
Most effective technological purging systems to prevent locking or coking up
Low cost-of-ownership due to excellent run time and low-cost of repair

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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

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. Material is 316 SS or 17-4 SS (depending on ASME pressure class) with RiTech® hardfacing and a minimum of 66 Rc hardness.

Additional options per customer specification: