For usual widths up to DN 5 ' (up to 130 mm), the system can be controlled manually without assistance of other hydraulic equipment.
Each unit of Stop/system consists of:
The welding socket is delivered in state when it can be welded on a pipeline immediately without further treatment. After finishing of work, the inner screw plug is screwed in the socket of the pipe fitting and covered with another protective screw plug. This ensures possibility of re-entry into the pipeline.
The sandwich closure ensures connection between the socket of the pipe fitting and closing or drilling device itself. It is made of light, mostly aluminium alloy. It is equipped with an air release valve.
The sealing plug consists of an extending rubber tyre ensuring maximum contact with a pipe wall. This sealing block is connected with outer control by a sealing shaft. Expansibility of the sealing plug can be controlled through this shaft.