What form is good for a check valve installed on water pipes?
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Check valves installed on water pipelines, with a diameter ranging from DN100 to 500. Question: In the above situation, what type of check valve would be suitable? In other words: What type of check valve can maintain good sealing performance over long-term use?
Check valves come in swing type, lift type, and wafer type. You can search for comparisons of the advantages and disadvantages of the three options, and then choose one based on your actual situation
If a better seal is required, then a soft seal is suitable; as for the specific type, it depends on the conditions at the installation site
First, consider the installation direction: horizontal or vertical. Generally speaking, for horizontal pipes, ordinary swing-type single-leaf or multi-leaf check valves can be used ； Vertical pipes prevent severe water hammer; check valves equipped with slow-closing devices can be used optionally. It is also necessary to consider whether it is the inlet or the outlet; for example, the bottom valve installed at the end of the suction pipe of some pumps is usually a vertical double-disc swing check valve. For proper sealing, soft seals are considered first; it is also possible to have the soft seal ring installed inside the valve seat (or valve disc). When the metal-non-metal seal fails, the sealing pair can still achieve a metal-metal seal.