Valve stem type
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Experts: What are the main differences between lift-type globe valves and rotary globe valves? Thank you.
It should be similar to straight stem and concealed stem. Could you explain the main differences between them?
My understanding is the difference between open-type and closed-type stems: in the open-type case, the position of the handwheel remains unchanged while the valve stem undergoes axial displacement; in the closed-type case, both the handwheel and the valve stem rotate simultaneously, and their axial positions also change, as the internal connection structure is different
In the case of a stem-type handwheel, its position remains unchanged, while the valve stem undergoes axial displacement. The hidden-stem handwheel and the valve stem rotate simultaneously, and their axial positions also change; the internal connection structure is different. In a stem-type valve, the valve disc is fixed to the valve stem, rising or falling together with it； The dark rod valve disc moves, rising or falling as it rotates.
The valve stem is divided into upper and lower sections; the upper section rotates together with the handwheel to move upward or downward, while the lower section moves upward or downward without rotating, along with the valve disc. The two sections are connected by steel balls for transmission. Does this type of globe valve belong to the category of open-ended stems or closed-ended stems?
The valve stem is divided into upper and lower sections; the upper section rotates together with the handwheel to move upward or downward, while the lower section moves upward or downward without rotating, along with the valve disc. The two sections are connected by steel balls for transmission. Does this type of globe valve belong to the category of open-ended stems or closed-ended stems?
It’s awkward; after working for so long, I’ve never seen anything like what you mentioned