FCCV series Volan Type Flow Control Valves (with check) is a type of valve that controls the pressure and speed of the fluid in one direction and serves freely from the other. The body on the shaft is set back and forth with a screw to determine the oil passage of the fluid. The control nut on the shaft protects and controls the power of the fluid precisely and ensures perfect adjustment by preventing vibration-induced changes in the flow passage setting.