Manual operation method for the high-pressure liquid control valve in hydrocracking units
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What brands are there, and is the method of opening each brand the same?
We are using TYCO valves from the United States, which are double-parallel gate automatic on/off valves.
It’s a method that requires manual activation; thank you
I can’t remember the brand; it’s an AB-type switch. We control the liquid level directly, without any cascade control related to flow rate.
Manual opening can be done through on-site instrument air or an on-site handwheel; the methods for using the handwheel vary.
The instrument air should be stopped; the switch for the handwheel functions in the same way as a valve.
The hydraulic control valve is a air-operated valve; if manual adjustment is required, the handwheel can be turned directly. The specific approach depends on the type of valve.