HYDRO-PNEUMATIC SERIES PRESSES
OVERVIEW, INSTALLATION, AND OPERATION
4
Power Stroke
For the cylinder to begin the power stroke, compressed air is supplied to port B2. This forces the
high pressure piston and rod down towards the working end of the cylinder. The high pressure piston
and rod travel until reaching the high pressure seal, which will be the point at which pressure begins
to build. As the rod and piston continue traveling, oil that was displaced during the rapid advance is
compressed and builds pressure. Once the work has been completed the cylinder will then retract as
mentioned above.
Power Stroke Only Option
HP Series Presses are also sold as power stroke only. This will simply eliminate the rapid advance
section and shorten the total travel of the cylinder.
For the cylinder to begin the power stroke, compressed air is supplied to port B2. This forces the
high-pressure piston and rod down towards the working end of the cylinder. In the power stroke only
configuration the high pressure piston and rod are always in contact with the high pressure seal. This
means that as soon as compressed air is supplied to port B2 the cylinder will begin building pressure.
As the high pressure piston and rod continue traveling the oil is compressed and builds pressure. The
cylinder will retract when compressed air is supplied to ports A1 and C1.