Counterpressure - double-disc globe valve cover
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Why is the bonnet structure of a reverse pressure – high inlet/low outlet stop valve different from that of a positive pressure – low inlet/high outlet one? What is the function of the pressing plate inside the red circle? Solve! ! ! !
What’s the difference from the ordinary one? Why is there an extra one?
I see now; the gland in the red circle is used to prevent the valve stem from rotating, allowing it to move only up and down, in a manner similar to what happens when the valve stem of a gate valve moves upward.
How to put it? Is the valve stem integral? ~~
The valve stem is indeed a single unit; the principle is the same as when a rising stem gate valve is opened – the valve stem moves only up and down