... adjust the weight of counterweight box, realizing precise balanceCharacteristics: 1. Intelligent design:Much longer stroke length, which can achieve 8MStroke and ... of phase. 3. High security4. Be easy to operate and intelligent adjustment, simple maintenance and low failure rate. 5. Convinent to ... -30-875264.65×2.4×14.85Skype: jackielym12 my6ym2yahoo.cn Intelligent Electric Drum Pumping Unit