... force control by hydraulic 3.Load:RYY (6-12t),RYYL( 20-28t) High quality of Hydraulic Spreader 1.Use to round ... mouth, ensure malfunction, can keep hydraulic cylinder pressure. 4. The hydraulic cylinder, valve body and hydraulic pump , according to user selecting the ... RIGGING CO. , LTD was built in 1986,has more than 20 years history, has accumulated rich experience in the sling manufacturing ...