Abstract: A system for sealing an unheading or isolation valve in a petroleum refining process. A bellows seal for preventing leakage of petroleum product and steam within the valve that is attached to a seat base structure and a dynamic seat that can move with the contour of a valve blind. A restrictor for restricting the motion of a dynamic seat relative to a seat base structure in a direction away from and towards the seat base structure.

Abstract: A seat system for a coke drum deheading valve can include a groove in the surface of the seat for supplying a lubricant to the surface of the seat. Various channels can be formed in the body of the seat that connect to the groove. In this way, lubricant can be flowed through the channels and into the groove to provide lubrication between the surface of the seat and the blind. The seat system can also include a split ring packing gland to facilitate the formation of a seal within the deheading valve. The split ring packing gland can be used to retain and compress packing positioned between a retaining ring and a dynamic seat such that when the packing is compressed, an improved seal is formed. By improving the seal, less steam can be required during the delayed coking process thereby increasing the efficiency of the system.

Abstract: A center feed system allows residual byproduct to be injected into a vessel from within the center of the vessel. The center feed system can include an inlet sleeve that is attached to the vessel and a retractable injection nozzle that extends into the vessel to inject residual byproduct into the vessel and that retracts into the inlet sleeve after injecting the residual byproduct. A retractable injection nozzle may include one or more openings that each includes an insert that can be removed from the opening. The inserts can therefore be replaced to customize the functionality of the nozzle or to replace the inserts when they have become worn.

Abstract: A cycle valve can include a valve body and a dynamic sealing spool assembly contained within the interior of the valve body. The dynamic sealing spool assembly includes a sleeve and a gate cartridge assembly which slides within the sleeve between an open and a closed position. The sleeve can include a sleeve opening while the gate cartridge assembly can include two openings, each of which includes a dynamic seat assembly. The dynamic seat assembly in one opening can be formed by upper and lower dynamic seats configured as solid blocks which seal the pathway through the valve when the gate cartridge assembly is in the closed position. The dynamic seat assembly in the other opening can be formed by upper and lower dynamic seats configured as cylinders which form the pathway through the valve when the gate cartridge assembly is in the open position.

Abstract: A de-header valve can include a flushing system for flushing undesirable material from the upper and lower bonnets while the de-header valve is opened. The flushing system can include three valves. A first valve controls the flow of steam to the de-header valve. A second valve controls the flow of water for flushing the bonnets. A third valve controls how the bonnets are drained. The third valve can be a three way valve that allows the bonnets to be drained to a pit during flushing, and also allows steam condensate to drain into a steam trap.