A, swing check valve: swing check valve disc is a disc, revolving around the shaft of the valve seat channel for rotary movement, because the valve channel into streamline, flow resistance ratio drop check valve small, សមរម្យសម្រាប់ល្បឿនលំហូរទាបនិងលំហូរមិន ជាញឹកញាប់ផ្លាស់ប្តូរអង្កត់ផ្ចិតធំ ...
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