Historical
SS-ISO 5781:2005
Hydraulic fluid power - Pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves - Mounting surfaces (ISO 5781:2000, IDT) (Swedish Standard)
This International Standard specifies, in order to ensure interchangeability, the dimensions and other characteristics of surfaces on which hydraulic pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves are mounted.It is applicable to mounting surfaces for hydraulic pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves, which represent current practice. They are generally used in industrial equipment.
Swedish Standards Institute [sis]