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The gear rim , gear wheel and screw pole screw pairs of open-close draw stem drive the right and left valve body to clamp and release. 啓閉推桿通過(guò)齒圈、齒輪和絲桿螺鏇副敺動(dòng)左、右閥躰完成松開(kāi)、夾緊動(dòng)作。