MARCHESINI Bi-Directional Flow Control Valve 1/2in BSP (50 L/Min Flow Rate) - Sparex Part S.139543MARCHESINI Bi Directional Flow Control Valve 1 2'' BSP (50 L min Flow Rate) Sparex Part No. S. 139543 USE AND OPERATION These valves are used to control the cylinder movements and block it in both directions. In order to have the descent of a load under control and avoid the load's weight being carried away the valve will prevent any cavitation of the cylinder. Type ''A'' is different due to the connection positions and the pilot ratio. MATERIALS AND