This kind of valve is comprised of piston assembly, spring, valve plate assembly and center pipe.

这种阀主要由活塞总成、弹簧、阀板总成及中心管等组成。

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This kind of valve is comprised of piston assembly, spring, valve plate assembly and center pipe.

这种阀主要由活塞总成、弹簧、阀板总成及中心管等组成。

youdao