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Advance Measurematics specially designed motorized basis weight control valve, V-notch ball provides equal percentage for characteristic with high precision control performance as well as strong cutting force and self cleanness function, especially suitable for control of medium containing fibre and tiny solids. Upper and lower shaft are fixed by bearing with good stability. Bearings are in composition material, loaded surface of which are sintered with superior abrasion resistant and self-lubricating function, which prevents valve seizing up during resistant and self-lubrating function, which prevents valve seizing up during service life. Therefore, it is widely used in control system in industries such as pulp and paper, chemical fibre etc.