HYDRAULIC WELL STANDPIPE

摘要

Hydraulic well standpipe has rod with upper support, cylinder with lower support, groundbush, sleeve placed between the cylinder and the piston of the rod, safety valve, loading device with loading valve of piston cavity. Besides that, the standpipe is equipped with loading device with loading valve of rod cavity and one-side hydro-lock, at that one-side hydro-lock is connected to output channels of loading devices of the piston and the rod cavities, and the sleeve is arranged as sealing with two-side action.