Delayed Coking - Lift Plug Valve
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The SchuF Valve Range forDelayed Coker Systems >

SchuF is the inventor of the Lift Plug Valve. The patent dates back to 1914. Since its invention SchuF has continued to develop the valve, with many innovations. These include the addition of electric, hydraulic and pneumatic operators, and new applications such as switching and dumping variants. It also pioneered the inverted plug design, which can be serviced in line; designed flushing systems; and several high pressure and high vacuum versions. SchuFs special high temperature valve range can be used in operating conditions to 1000Ұ C. The valve essentially consists of only two parts, the...

The originalӔ Lift Plug Valve 14NR > L ConfigurationT Configuration SchuF Chemieventile Vertriebs GmbH & Co KGAn der Guldenmּhle 10; 65817 Eppstein; Germany E-mail: sales@schuf.com; Telephone: +49 6198 571 100 >

Pneumatic Actuator, Special Plate (no lift)Electric Motor LTSHydraulic lift, Hydraulic turn central line control station local facility link to master control system BPV-1 control cubicle PLC IV-1 SV-1 IV-2 visualization feed from heater SchuF Valves for Delayed Coker SystemsPB1010907 revision 1.0 Web Site: www.schuf.de >

Delayed Coking is one of the most hostile environments in the refinery with process temperatures of 1000 F and which outputs a very abrasive and erosive coke by-product. As a result valves are cycled more frequently than in other parts of the refinery and failure can lead to complete shut down of a unit. This can lead to large process and financial cost.Delayed coking is a semi-continuous thermal cracking process. After being heated in a coke furnace the coke feed (a liquid-vapour combination) is fed into and separated in a coke drum. Delayed cokers are designed as pairs (or three) of drums...

The Switching Valve is the heart of the delayed coker process. The SchuF SwitchPlug Valves illustrated on this page are ideally suited as switching valves in delayed coker systems.A four way switching valve is typically required to allow coke feed into whichever coke drum is active. During start up, shut down or an emergency the valve can also bypass both drums. If three drums are used, SchuF can supply a single valve with four outlets.SchuF switching valves offer great flexibility:the plug can be straight up or inverted the actuation can be electric with two motors or with one motor and...

The IsoPlug valve can be supplied in sizes up to 36֔. Smaller sizes up to 16 are usually actuated electrically with the SchuF LTS operator. Valve sizes over 24Ԕ are usually fitted with two actuators, controlled by a PLC housed in the control panel supplied with the systemFlushing and purging connections are also supplied; two flush connections at the top, one at the bottom and two purge connections at the side. If there are leaks as a result of sealing surface damage, the purge prevents accumulation of coke between the plug and the body.The valve can be supplied with an inverted plug as...

The key advantages of a lift plug valve for coking systems are their simplicity and crevice free design. In any position, be it open, or in a particular switching position, the plug and the body form a smooth continuous contour, without gaps or crevices. This eliminates the need for flushing during routine operation.To operate the lift plug valve, the plug is raised slightly from the body. It can then be turned easily, without the type of torque associated with a ball valve. Once the plug has been turned to its required position, the plug is lowered again. During operation the valve is...

Lift Plug Valve Ball Valve > Simple rugged design, only two main partsPlug seizing is not possible Seals do not wear during operation Seat seals are load free during rotation, but thrust loaded by lowering the plug after the rotation, ensuring a perfect sealFlushing only required during valve operationIf flushing fails while valve is in service the valve suffers no ill effectsUses two actuators for the most rugged design at larger sizesAutomation can be more complex Low torque required to turn the valve Electric, hydraulic or pneumatic actuation Switching valves available with inlet from...

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