外螺纹阀杆及阀轭的英文

outside screw and yoke (os & y)

• 外:    outside; external ...
• 螺纹:    screw thread; flig ...
• 阀杆:    valve stem; valve ...
• 及:    reach; come up to
• 阀:    established house ...
• 轭:    yoke