ADVANTAGESVELAN BALLMODIFIED COMMODITY BALLPLUG Over 700 valves are currently installed in Few installations and, in some cases, Certain essential design features EXPERIENCE delayed cokers worldwide. Valves have a short time period in service make it have limited their use in newer installations. been in service 1983.difficult to evaluate performance. AUTOMATION Single 90ְ rotary motion allows for simple, Few installations and, in some cases,Automation requires accommodatinglinear and RELIABILITY inexpensive and reliable actuation.a short time period in service make itrotary motion. The mechanism...

AUTOMATION The Stem Coupling is designed to perform 3 mainfunctions: The electric, hydraulic or pneumatic actuator isselected in function of coker service. A large torque safety factor ensures the valve will cycle under the most stringent conditions. When selecting actuators, special attention is paid to the coker deck environment. ❏ > Protect against "overtorquing" of the stem. ❏ > Protect the actuator components. The adjacent photograph shows a 12" switch valve installed with the stem in the horizontal position. The valve is installed in a delayed coker unit, where the valves were interlocked...

The valves shown in the adjacent photograph were installed as part of a debottleneck project aimed, among other things, at increasing the units liquid yield. As this was an existing structure it was important to minimize piping changes. Because the existing valves were 70% plug valves the engineering firm evaluated full bore plug valves, but found the unitsҒ weights to be substantially higher. Rather than evaluate the structural changes required in order to accept these heavier, larger units the end user opted to use our lighter full bore ball valves. As a bonus, the ball valves provided a better...

This patented Velan Ring Valve was installed to replace an existing butterfly valve. The end user required the use of this valve only when shorter cycle times required quicker drum "backwarming". The end user could not justify the high pressure drop across the butterfly valve with his efforts to increase liquid yield. They required a valve with good throttling characteristics, but which provided no obstruction in the full open position. The Ring Valve fully met these requirements. > Showingposition ofmaximumpressuredrop NO OBSTRUCTION (HIGH CV) in the full openposition. EXCELLENT THROTTLING CHARACTERISTICS....

Velan maintains a group that has handled delayedcoker applications exclusively for over 20 years. The groups design and service staff maintain contact with end users regularly appraising valve performance in the field. Our approach has yielded several design improvements over the years based on evolving coker operating trends. > Fully automated, fully interlocked valve operation for a safer drum switch and unheading. Total remote operation capability of switch andisolation valves including logic or hardware features to avoid unwanted operation. Simple,Reliable Automation. Process Debottlenecking....