Overview - ISO 7241:2023 (Hydraulic quick-action couplings)
ISO 7241:2023 specifies the dimensions and basic performance requirements for two widely used series of hydraulic quick-action couplings used in hydraulic fluid power systems. The document covers interface dimensions, mechanical and hydraulic performance (rated and burst pressures, flow rates, pressure drop, fluid loss), endurance testing and special requirements for agricultural applications. This second edition replaces ISO 7241:2014 and includes updates such as revised nominal size designations (e.g., 19, 38, 51), addition of an impulse pressure test requirement (ISO 6803), and minor corrections and graphical updates.
Keywords: ISO 7241:2023, hydraulic quick-action couplings, hydraulic fluid power, dimensions and requirements, Series A, Series B
Key topics and technical requirements
- Two coupling series defined:
- Series A - predominantly used in Europe and preferred worldwide for agricultural and forestry machinery; includes additional requirements for agricultural use (per ISO 5675).
- Series B - predominantly used in North America and in the chemical industry.
- Dimensional requirements - detailed interface geometry and gauge diameters for multiple nominal sizes to ensure interchangeability.
- Performance requirements - specified by size:
- Rated pressure and minimum burst pressure values.
- Rated flow and surge flow capacities.
- Maximum allowable pressure drop at rated flow.
- Maximum fluid loss per disconnect limits.
- Testing and verification:
- Pressure impulse testing per ISO 6803 for 100 000 cycles (coupled and uncoupled conditions) as referenced to ISO 18869.
- Burst pressure and pressure-drop testing per ISO 18869.
- Materials and workmanship:
- Performance values apply to standard carbon steel couplings; alternative materials require customer–manufacturer agreement.
- Requirements for valve hardness, surface roughness and general workmanship.
- Identification and marking - designation, marking and reference statements to ensure traceability and correct application.
Keywords: rated pressure, burst pressure, pressure impulse test, ISO 6803, ISO 18869
Applications and who uses ISO 7241:2023
- Manufacturers designing and producing hydraulic quick-action couplings to ensure dimensional interchangeability and certified performance.
- OEMs and designers of agricultural, forestry, construction and industrial hydraulic systems specifying compatible couplers.
- Test labs and quality departments verifying compliance (pressure impulse, burst, flow and leakage tests).
- Procurement and maintenance teams ensuring replacements meet required flow, pressure and leakage specifications.
Practical benefits include improved safety, predictable hydraulic performance, easier equipment interchangeability and reduced downtime on machinery where quick connections/disconnections are routine.
Keywords: agricultural machinery couplers, coupling interchangeability, hydraulic system safety
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