The PCL4 is a stackable hydraulic control-pressure valve intended for the proportional, hydraulic remote control of directional valves, pumps with variable displacement, positioning cylinders, etc. It can be obtained with a coordinate lever (joystick), linear lever or foot pedal as the activating device. The VPO4 is a stackable, pneumatic control-pressure valve intended for the proportional, pneumatic remote control of directional valves, positioning cylinders etc. It can be supplied with a coordinate lever (joystick) or different linear levers.