ISO 4401:2005 specifies the dimensions and other data relating to surfaces on which four-port hydraulic directional control valves are mounted in order to ensure their interchangeability.
It applies to mounting surfaces for four-port hydraulic directional control valves which represent current practice. They are generally applicable to industrial equipment.
Below we have listed all of the CETOP valve sizes and stated the maximum flow capability for each size.
Please note, the size 5 CETOP unit can be used as a single stage valve (with a maximum flow of 120 Litres Per Min) however, using a 2 stage valve allows the valve to handle a larger flow of oil (Up to 160 Litres per Min)