The extension includes handwheel, non-rising stem, fittings and extensions to allow remoteoperation normally from above.
加长件包括手轮，暗杆，连接件和加长件，允许在上方进行远程操作。
3
The system, equipped with infrared adjusting technology, allows both an improvement in not only remoteoperation of zero setting and alarm value setting, but also the leakproofness and security.