Flowing open toward the direction of the valve opening flow, cavitation, erosion mainly on the sealing surface, so that the valve core and valve seat sealing surface quickly suffered damage; flow closed toward the flow direction, cavitation, red Erosion in the throttle after the valve seat sealing surface to protect the sealing surface and the valve root, extending the life. Therefore, for the open-type valve used to extend the life of the more prominent issue, just change the flow to extend the life of 1 to 2 times.
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