This standard applies to the mounting surfaces of plate-connected hydraulic pressure control valves (excluding relief valves), sequence valves, unloading valves, throttle valves and check valves.
GB/T 8100-1987 history
2021GB/T 8100.3-2021 Mounting surfaces of hydraulic valves—Part 3: Pressure-reducing valves, sequence valves, unloading valves, throttle valves and check valves