BHI HydroRam HK300S, Operations Manual & Parts List

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BHI
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3) Power Stroke
The difference of the area A1<A2 makes the
Piston(E) move downward until Cylinder P2 Port
communicates with P3 Port. When the Piston(E)
comes down, its descending speed is
accelerated by the pressure of gas in the Upper
Chamber of the Piston.
4) Impact
Kinetic energy obtained by the Piston
during the power stroke is transmitted to the
tool(H) and then impact energy required to
break is transmitted to the rock. After that,
Piston starts to move upward again.
B1 : Valve High Pressure Port P1: Cylinder High Pressure Port
B2 : Valve High Pressure Chamber P2: Cylinder Converting Port
B3 : Valve Low Pressure Port P3: Cylinder Low Pressure Port
B4 : Valve Converting Port P4: Upper Port of the Piston
V1 : Valve Converting Area H: Tool
Gas : N2 gas Chamber E: Piston
K : Valve