The invention relates to a reverse rotation protection for borehole pumps, said reverse rotation protection being mounted in a drive head. The reverse rotation protection comprises a housing and a clamping tool for securing a polished rod. The clamping tool comprises at least two exchangeable contact elements which detachably fix the polished rod.
申请公布号
WO2012146234(A2)
申请公布日期
2012.11.01
申请号
WO2012DE00416
申请日期
2012.04.19
申请人
NETZSCH OILFIELD PRODUCTS GMBH;CEMIN, ANGELO;DITTRICH, JOCHEN;ZUBER, ALEXANDER