Gravity ball check valves are converted to vent valves by replacing the standard ballwith a floater ball and inverting the valve at installation-withseat up.
When the closed channel, the wedge-shaped head with a stem to open up the ball and pressed to seal the valveseat.
当关闭通道时,用阀杆的楔形头使球体涨开与阀座压紧达到密封。
3
The pump valve has a structure of semi-spheric plunger with guide rod, and its seat and ball are aligned by means of a spring, and it is opened and closed in time.