Electric squeezing is achieved by rotating a screw rod to push and apply pressure.
Pneumatic compression is the process of pressurizing a cylinder by driving it with compressed gas.
Hydraulic pressure is the use of a suction pump to force the liquid to increase pressure and drive the plunger to lift and increase pressure.
Common faults:
Pneumatic faults generally include damage to the solenoid valve, leakage of the cylinder sealing ring, or inflexibility of the piston extension rod.
Hydraulic faults generally include damage to hydraulic pumps, pump blades, solenoid valves, and oil leakage from solenoid valves and plunger sealing rings.