The Wilson-Snyder Coker Switch Valve can be best described as a diverter valve. It does not cut off flow from the inlet to one or more outlets so that the flow through the valve is continuous during a switch. Used in the delayed coking process(produces anode, needle and fuel grade coke at elevated temperatures), theswitch valve is the valve that diverts coke flow from the heater to one drum or the other or sends it to bypass as required. The Wilson-Snyder switch valve has proven to be a rugged, durable valve for this tough service (continually cycles 700 to 950o F). It is an inverted tapered plug valve with the inlet through the bottom and positioned so flow through the valve is continuous during a switch. The design and materials make the valve stronger and more durable than any other design. The body is forged 9 chromium alloy steel developed for high temperature service and the 410ss plug has proven especially durable over the years. The valve body and plug are precision ground to form a pressure tight metal to metal sealing surface.
The Wilson-Snyder switch valve’s performance is greatly enhanced by automatic operation. Precise control of the position of the plug prevents improper seating(causes the valve to coke up and/or gall the seat faces resulting in a leak). Whenever the valve seating has been automated, the valve has had no operational problems and has not needed repair over several turnarounds. Early automated versions proved that automatic operation extended the valve life and reduced the need for repair but did not offer the control to fully automate the switch. Several years ago, Wilson-Snyder teamed up with MEA Incorporated to develop a modern actuator that could be integrated into an automated process control scheme. MEA is an industry leader in electro-hydraulic actuators in refinery applications.
The basic actuator package consists of two components.
- The first is the actuator itself. This is mounted on the valve ａnd includes a double acting ram to seat or unseat the valve with all the force necessary and under precise control, a bi-directional hydraulic motor to rotate the plug, electronic sensory devices to determine the plug position and a back-up hａnd wheel for manual operation.
- The second component is the hydraulic manifold that controls the actuator. It can use manual valves to control the seating/unseating and rotation or add a programmable controller to coordinate the switch by push button or process control.
There is enough capacity in the controller to control the Wilson-Snyder valve ａnd all associated valves during a switch. This would allow a fully controlled switch that would increase safety and efficiency. The controller can also communicate with the customer’s process control system. The actuator can be provided with ahydraulic power unit (HPU) to provide the hydraulic power necessary to operate thevalve.
The Wilson-Snyder switch valve with the MEA actuator provides a system with a proven, reliable valve now operated automatically with a controller featuring precise operation fully integrated with process control. This system allows a customer to operate longer and with fewer operational problems and eliminates the valve as a turnaround concern.
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