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1?There are many port size to be choosen 1/8"?1/4"?3/8"? 1/2"?3/4"?1"?2?It allowes the fluid to flow the in port to the out port, but not reverse?
3? Can be used to prevent counter flow caused by pressure decrease due to air source pressure decrease or air consumption increase?
4?There is large valid area of section;5?The spool is made of POM, valve's crater is sealed by rubber, and have a compact structure.

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