对阀盘、耳轴活塞杆头的染料渗透剂测试。
Dye-penetrant testing of the disc trunnions and piston rod heads.
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。
When the closed channel, the wedge-shaped head with a stem to open up the ball and pressed to seal the valve seat.
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。
When the closed channel, the wedge-shaped head with a stem to open up the ball and pressed to seal the valve seat.
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