Hydraulic elevator type CDZH is a side door elevator with double-valve structure. Through changing the bushing, it can handle drill pipes, drill collars, casings and tubings. By using the. the hydraulic-controlled system, it can make the operation more convenient, reduce the workers'labor intensity effectively and improve work efficiency. It can also realize remote controlling and make the using safer and more reliable. The products shall be designed and manufactured according to API Spec 8A?8C Specification for drilling and production hoisting equipment.
  

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