VODL/SC/CC Series - Aluminium body - Steel bodied units available on request - add suffix AC This valve controls a moving load in both directions preventing it from moving ahead of the pump and locks the load in any position on U1 and U2. This valve permits free flow from D1 to U1 & D2 to U2 and blocks the flow from U1 to D1 to D2 until a pilot pressure generated at D1 or D2 is sufficient to pilot the U1 or U2 port open. It is utilised in combination with a closed centre spool valve. It is recommended to fit a port relief in this application.