Configured for butterfly valve actuation in engine control loops, the Woodward 8235-650 (PISC II ProAct Integrated Speed Control) provides direct physical/electrical execution. The actuator driver module precisely regulates air or air-fuel mixture flow by converting control loop commands into high-torque shaft displacement. Operating across a nominal 18 to 32 VDC input supply, it maintains closed-loop position stability across gaseous and diesel-fueled engine applications.

Hardware Specifications

Actuator Loop Feedback Response & Speed Regulation

The Woodward 8235-650 incorporates internal position feedback sensing to optimize actuator loop feedback response. The integrated driver electronics continuously compare input setpoint commands against physical butterfly valve shaft angle, delivering immediate dynamic torque adjustments to overcome aerodynamic flow forces. This rapid dynamic response reduces leakage and maintains steady-state speed control under variable engine load profiles.

Frequently Asked Questions

Q: What input supply voltage parameters are tolerated by the Woodward 8235-650 driver module?

A: The module operates on a nominal supply voltage range of 18 to 32 VDC, with internal voltage suppression handling severe transients between 8 and 40 VDC for durations up to 1 minute.

Q: What are the physical process interface limits for the DN 120 valve assembly?

A: The housing and valve body are rated for a maximum working pressure of 5.2 bar absolute, accommodating flow media temperatures up to 85 deg C.

Q: Which sealing specification is required for flange groove installation?

A: Flange mating interfaces require standard Parker 2-255 specification O-rings to ensure a gas-tight seal at the process connection.

Field Installation Guidelines

• Verify that process piping is fully depressurized and cleared of particulate debris prior to installing the DN 120 valve body.
• Inspect Parker 2-255 O-rings for defects and seat them evenly in the flange grooves before torquing flange bolts.
• Route 24 VDC power and control wiring using shielded twisted-pair cables, keeping them isolated from high-voltage spark ignition lines.
• Terminate cable shielding at the control panel ground bus only to prevent common-mode noise on position command inputs.
• Ensure mounting bolts are secured with full thread engagement, accounting for the 5.4-inch center of gravity offset from the valve bore centerline.