... 2.Conventional beam pumping unit 3. simple, stable, convenient, long service life pumping unitCharacteristics:1. "H" section steel structure, high strength ... long service life.4. Brake adopts internal expanding or external structure . The brake has safety devices, which can brake quickly, ... polished rod loadStrokeRated torque of reducer(lbs)(in)(in.lbs)C-912D-470-24047,000240, 211, 181912,000C-912D-427 ...