Sterling XPRO904D Proportional Valve Controller

The Sterling XPRO904D Proportional Valve Controller is a 24 VDC PWM driver designed to actuate Parker XPRO904d and related proportional valves in hydraulic circuits. It delivers a PWM command to control valve coil current, enabling proportional spool movement for precise flow and pressure control. The XPRO904d is part of Parker’s XPRO902/932/904/934 series, with a maximum power draw of 19 W from a 24 V supply. PWM frequency is cited in Parker literature in the range of 95–230 Hz (some documents list 110 Hz depending on revision). Typical applications include industrial automation and mobile hydraulics where repeatable, calibrated valve actuation is required, and the controller is used alongside Parker hydraulic cartridges to achieve smooth, programmable valve response.