B) CB140, CB210, CB380

B) CB140, CB210, CB380

Start up

When operator put breaker on the breaking target material and activates carrier breaker switch, high pressure oil comes to piston lower part (C), inside valve & outside valve upper part and entrance of accumulator (J). At this stage, valve is pushed down by high pressure oil outside valve upper part (E) and low pressure oil at piston upper part (D) is connected to return line.

Piston raising

High pressure oil at the piston lower part (C) raises piston up inside back head gas chamber (B). At this stage, nitrogen gas inside the chamber (B) is compressed and low pressure oil at the piston upper part (D) returns to the carrier oil tank.

High pressure

Low pressure

Valve position change

While piston is moving up, high pressure oil at the piston lower part (C) comes into channel (H) and reaches the outside of valve middle part. At the same time high pressure also comes inside accumulator (J), compressing gas inside accumulator gas chamber. At this stage, valve moves up and opens the channel for high pressure flow to come into piston upper part (D).

Impact striking

Compressed nitrogen gas at the chamber (B) with high pressure at the piston upper part (D) pushes piston and piston strikes tool (T), delivering impact energy to the breaking target material. At that time the compressed gas inside accumulator pumps "accumulated" high pressure oil into piston upper part, increasing piston striking speed and power. At this stage, pilot channel (L) is connected to return line, then valve moves down and cuts high pressure flow into piston upper part (D), then piston upper part area (D) is changed to low pressure and piston lower part area (C) is changed to high pressure which puts breaker into start up position again.

High pressure

Low pressure