Why are the large oil and gas lines in coking units equipped with ring valves?
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Why are ring valves installed on the large oil and gas lines of coking units?
Ring valves can regulate flow and have good anti-coking capabilities.
Ring valves can regulate flow and have good anti-coking capabilities.
This post on http://bbs.hcbbs.com/thread-102028-1-1.html can provide the answer
During the preheating process of the coke tower here, the preheating procedure for the new tower is lengthy and there is significant resistance to the flow of oil and gas. To ensure effective preheating of the new tower, the loop valve on the main oil and gas line is manually closed in order to increase the amount of oil and gas flowing to the new tower. The loop valve has a minimum opening degree; it cannot be completely closed, which allows for proper flow control while also preventing the main line from being fully shut off