4WP6Y6X/5

The 4WP6Y6X/5 spool valve belongs to the WP Pneumatic Spool Valves series manufactured by Bosch Rexroth and serves as a directional element in hydraulic automation where compressed air drives the internal spool. It is a size 6 unit that is direct-operated, so the pilot signal acts directly on the spool without intermediate amplification, shortening response times. Pneumatic actuation means the control pressure is supplied by air rather than an electrical coil or hydraulic pilot. A spool symbol Y defines the internal flow paths selected by the spool land geometry, while four main ports allow connection to pressure, tank, and two work lines in typical circuits. The valve manages up to 60 l/min, making it suitable for medium-flow manifolds. Because installation position is unrestricted, designers can mount the body horizontally or vertically without affecting performance. Fluid cleanliness should meet ISO 4406 20/18/15; maintaining this rating limits particulate wear on the precision spool lands.

The hydraulic side of the valve tolerates a maximum operating pressure of 315 bar, ensuring compatibility with high-pressure supply manifolds. The air pilot channel functions between 4 bar and 10 bar, with the lower figure representing the minimum pilot pressure required to shift the spool and the upper figure defining the permissible pilot limit. A pilot volume of 4.24 cm³ must be filled during each actuation, which influences the sizing of the pneumatic control lines. The design supports a maximum switching frequency of 7 200 cycles per hour, allowing rapid sequence operations in automated presses or clamping stations. Tank return lines may rise to 160 bar without risking internal leakage past the spool seals. These characteristics give system engineers clear boundaries for pressure control, pilot supply, and cycling rate when integrating the 4WP6Y6X/5 into hydraulic machinery.