1 This International Standard specifies clamping dimensions of four-port modular stack valves and four-port directional control valves, sizes 03 and 05, on mounting surfaces. The dimensions and sizes conform to ISO 4401 so as to ensure interchangeability of these valves and to reduce the number of fixing devices to be used.
2 This International Standard applies to damping dimensions of four-port modul?r stack valves and four-port directional control valves which represent current practice. They are generally applicable to industrial equipment.
DS/ISO 7790:1989 history
1989DS/ISO 7790:1989 Hydraulic fluid power. Four-port modular stack valves and four-port directional control valves, sizes 03 and 05. Clamping dimensions