Abstract: A pressure operation control module is provided for a coolant recovery device and includes a gas path flow division module, two pressure-variable cylinders, a motor, and at least one the control circuit. The gas path flow division module has high-pressure and low-pressure coolant terminals respectively coupled to high-pressure and low-pressure electromagnetic valves and high-pressure and low-pressure sensors for providing connection control and pressure detection of the high-pressure and low-pressure terminals for coolant recovery. The variable-pressure cylinders each have an output terminal connected to an input terminal of the gas path flow division module. The pressure-variable cylinder includes at least one piston/connection rod assembly including a connection portion and a joint portion. The piston/connection rod assembly maintains a linear movement in the pressure-variable cylinder for all angles.