... ,easy operation and maintenance etc .the technical parameters accord with industry standard for the people's Republic of SY/T5044 ... as to reduce the stroke frequency for exploitation ,pumping unitType API spec 11ERated suspension center loadReducer TorqueStroke Stroke FrequencyMotor Power Machine QualityCYJ3 ... 3-37HY320-213-120100373.0,2.5,2.16,9,123018.0CYJ12-4.8-73HF640-256-192120734.8,4.2,3.65,7 ...