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ISO 5781:2000
Hydraulic fluid power -- Pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves -- Mounting surfaces
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.
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International Organization for Standardization [iso]