Woodward CPC-II

Woodward CPC-II

Product Introduction
The Woodward CPC-II is an industry-standard series of Current-to-Pressure converters renowned for their exceptional accuracy, reliability, and self-cleaning valve technology. Designed for the most demanding turbine and engine control applications, the CPC-II ensures precise positioning of fuel and steam valves.

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Description

Woodward CPC-II

Technical Specifications

  • Product Family: CPC-II Series I/P Converters.
  • Input Signal: 4-20 mA DC.
  • Output Pressure: Various ranges available (e.g., 3-15 psi, 6-30 psi).
  • Supply Pressure: Up to 40 psi (depending on model).
  • Intrinsic Safety: Available in ATEX/IECEx certified configurations.

Functional Features

  • Self-Cleaning Valve: Patented valve design prevents sticking due to oil or particulate contamination in instrument air.
  • High Resolution: Exceptional resolution ensures smooth, step-less valve movement.
  • Status Indication: Optional health and status indicators for internal diagnostics.
  • Wide Compatibility: Interfaces seamlessly with all major digital turbine controllers.

Application Scenarios
Critical component in steam turbine inlet valve control, gas turbine fuel valve actuation, and compressor anti-surge control systems.

Performance Parameters

  • Accuracy: ±0.25% of span.
  • Hysteresis: Less than 0.1% of span.
  • Air Consumption: Extremely low standby and operating consumption.

Material Composition
Rugged aluminum or stainless steel enclosure with precision-machined internal components and corrosion-resistant coatings.

Structural Characteristics

  • Design: Modular, field-serviceable design.
  • Adjustments: Zero and span adjustments accessible without removing the cover.
  • Indicators: Visual position indicator and optional electrical status switches.

Working Principle
The CPC-II utilizes a force-balance principle where the electromagnetic force from the input current is balanced by the pneumatic feedback force. The self-cleaning valve spool continuously oscillates at high frequency, preventing the accumulation of contaminants and ensuring reliable operation.

Installation Requirements

  • Install with the output port facing downward when possible to prevent moisture accumulation.
  • Use properly sized tubing to minimize volume and improve response time.
  • Ensure the instrument air meets ISO 8573-1 quality standards.

Usage Precautions

  • Do not use silicone-based lubricants or sealants during installation.
  • Perform annual calibration verification.
  • Replace the internal filter element if a decrease in response time is observed.

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