What kind of valves are generally used for the boundary valves in circulating water pipelines? ? ?
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Circulation water pipelines are generally thick, and butterfly valves are commonly used for selecting valves at the boundary zones; however, internal leakage is often observed with butterfly valves in actual use. Are there any other types of valves that can be used as alternatives? ? ?
Large gate valves with worm gear drives are also suitable. With good water quality treatment, soft-sealed butterfly valves connected by flanges are excellent.
For large-diameter applications, butterfly valves are the preferred choice: they require less space, have a lower cost, and are easy to operate
It was just installed, and the pipeline leaked as soon as pressure testing was done – such poor quality for this valve. . . . Sigh
Most of those used here are turbine gate valves!
Butterfly valves are commonly used, available in manual and electric versions. If high sealing performance is required, ball valves should be chosen; they are larger in size and heavier, more difficult to operate, and more expensive, but they offer excellent sealing properties, so electric ball valves are a good option.
Internal leakage in valves, especially in valves of new pipelines, should not be simply attributed to valve quality. I feel bad for the people at the valve manufacturers. Was it thoroughly purged before pressure testing? Not to mention the small welding slag – when things like brooms, welding rods, stones, and gloves get stuck on the valve’s sealing surface, preventing it from closing, people end up using large wrenches to force it shut. How is it possible for the valve not to get damaged in such situations?
For applications with large diameters and low pressures, butterfly valves are often chosen; however, their failure rate is quite high. Almost all of the handwheels on the butterfly valves in our company have been damaged (due to issues with both the quality of the valves and their operation). I think gate valves are a better choice. For the circulation water replenishment system, we originally used an electric butterfly valve along with a level-controlled water supply valve, but both of them had internal leaks, so we had to install a gate valve instead. . . . .
There are also many that use gate valves, not just butterfly valves
You mean, it’s possible; preventive measures have been taken in advance. The valve remains closed before purging, as there is a risk that something might get stuck in the valve if it is opened, preventing it from closing properly. The current situation is that the valve hasn’t been opened, so pressure can’t be applied! I’d also like to know how you purge the circulating water pipelines over there
Okay, thank you, I understand. We use this type of valve for our relatively thick steam pipelines!