REXROTH 4WRPEH series Directional control valves

Testing and maintenance equipment: such as a dedicated maintenance test box (R901049737), which can be used for offline testing, diagnosis, and parameter setting of valves.

Selection and Application Points

Clarify control requirements: Firstly, determine whether it is position, speed, or pressure control, as well as the requirements for dynamic response and control accuracy.

Select valve core function and flow rate: Select the neutral function (C3, C5, etc.) based on the principle of hydraulic circuit, and calculate and select the rated flow rate of 50 or 100 L/min according to the maximum flow rate of the system and the expected working pressure difference.

Determine the level of interface and intelligence: choose analog interfaces (A1, F1) for traditional PLC control, or choose IO Link interface (L1) to achieve digital, intelligent integration and advanced safety functions. If considering safety shutdown, it is necessary to choose component series 31 and above models.

Check the compatibility between the environment and the medium: confirm the compatibility of the environmental temperature, vibration conditions, and the hydraulic oil and sealing material (NBR/FKM) used. For special media such as flame retardant liquids, attention should be paid to the potential performance degradation they may cause.

Safety integration considerations: If IO Link valves are used for safety shutdown, it is necessary to strictly follow the requirements of operating manual 29118-B, conduct risk assessment, and implement necessary periodic diagnostic monitoring outside the valve to meet the target category and PL level.

System integration: Pay attention to internal leaks in the fault safe position and design the hydraulic circuit reasonably. Ensure power supply quality and configure the correct external fuse (such as 13.15A delay type).