End of the valve body, valve cover, valve, seals and gaskets and other parts, single or double valve and valve type valve flap valve etc.. At the end of the valve in the access pipe, the liquid medium from the direction of the valve cover into the valve, the fluid pressure acting on the valve, the valve was opened to allow the medium flow through the valve body, when the medium pressure change or disappear when the valve shut down to prevent the media back
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