Type 4WRKE Proportional Valve

A: Yes. BOKIN 4WRKE valves are independently developed products designed to match ISO 4401 mounting dimensions, port sizes, electrical interfaces and hydraulic performance of equivalent Rexroth 4WRKE configurations. They support direct drop-in installation in compatible systems. We recommend sharing your full model code for suitability confirmation.

A: 4WRKE is a pilot-operated series for large flow (170–4700 L/min) heavy-duty systems; 4WREE is a direct-acting series for small & medium flow (4–180 L/min) precision scenarios.

A: Four modes are available: external pilot supply & external return, internal pilot supply & external return, internal pilot supply & internal return, external pilot supply & internal return. They can be selected according to system pressure and circuit design.

A: Multiple spool profiles are available including standard E type, overlapped W type, and special flow characteristics, with both linear (L) and fine-control (P) flow curves to match different speed and pressure control requirements.

A: Yes. All 4WRKE valves are pre-calibrated at the factory. The zero point of the main stage can be adjusted within ±30% of the nominal stroke via the potentiometer on the integrated electronics, operated by trained professionals.

A: The main valve requires ISO 4406 class 20/18/13 cleanliness, and the pilot stage requires class 17/15/12. Effective filtration is recommended to prevent faults and extend component service life.