Gate valves can get stuck due to temperature changes
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Gate valves are designed to prevent locking due to temperature changes; typically, they are turned to the fully open position and then reversed by 1/2 to 1 turn as the position representing full opening. Please explain this: at what temperature changes can locking occur? Which components are responsible for the expansion and contraction caused by temperature changes, and what is the exact process involved? Also, do any of you experts have any materials on valves that you could share? Thank you
At high temperatures, the valve plate and valve body expand and get locked
Turning the valve on the steam by 1/2 to 1 full turn still results in it getting stuck; this happens not only due to heating but also because the lubricating oil in the drive mechanism evaporates completely at high temperatures. It’s best to maintain it regularly and keep it active.
Parallel double-disc valve with expansion-type actuation.
1. When opening the valve, turn it 1/2–1 full turn more than necessary； 2. Valve fittings should be inspected and maintained promptly, and moved regularly.