Double seal valve can not be used as a shut-off valve

The advantages of two-seater valve spool force balance structure, allowing pressure, but it highlights the shortcomings of the two sealing surfaces can not be a good contact at the same time, resulting in a large leak. If it is artificially and purposely used to cut the occasion, apparently ineffective, even for it made many improvements (such as double seal sleeve valve), is not desirable. More keyword search: seal valve

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