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Woodward 9907-306
Product Name: CPC-II Current-to-Pressure Electro-Hydraulic Converter, Explosion-Proof Version
Product Overview: Intrinsically safe explosion-proof CPC-II electro-hydraulic converter certified for Zone 2 hazardous areas. It receives a 4-20 mA control signal and linearly converts the electrical signal into hydraulic output pressure to drive single-acting servos. The electrical section complies with explosion-proof safety standards for hazardous working conditions.
Detailed content
Technical Specifications:
- Control Input: 4-20 mA intrinsically safe signal
- Power Supply: 24 VDC intrinsically safe circuit supply
- Medium: Turbine lubricating oil
- Supply Pressure: 0.6-1.0 MPa
- Output Control Pressure: 0-0.55 MPa
- Explosion-Proof Rating: Ex d IIB T4
- Operating Temperature: -20°C to 75°C
- Protection Class: IP65
Functional Features:
- Flameproof enclosure meets explosion-proof standards; can be directly installed in Zone 2 flammable and explosive hazardous areas.
- Intrinsically safe electrical circuit design, requires matching intrinsically safe barrier.
- Built-in pressure closed-loop feedback; output oil pressure is not affected by supply pressure fluctuations.
- Automatic depressurization on power loss; output pressure returns to zero and the actuator safely resets.
- Enclosure protection upgraded to IP65, resistant to dust and humid environments.
Application Scenarios: Steam turbine control in chemical park explosion-proof zones, electro-hydraulic conversion in hazardous areas near gas turbine bodies, servo systems for turbine drivers in oil and gas industries, turbine unit upgrades in flammable and explosive plants.
Performance Parameters:
- Linearity: ≤ ±0.5% FS
- Hysteresis: ≤ 0.4% FS
- Full-range response time: ≤ 80 ms
Material Composition:
- Flameproof enclosure: Thickened cast aluminum alloy flameproof housing
- Valve core and sleeve: Hardened stainless steel
- Seals: Oil-resistant fluororubber, PTFE sealing
Structural Features: Hydraulic interface at the lower part of the valve body, thickened flameproof electrical compartment at the upper part; flameproof wiring ports use explosion-proof glands, ordinary cable connectors are not allowed; the hydraulic chamber and the electrical flameproof compartment are completely isolated; the flameproof surfaces are precisely fitted, and on-site disassembly of the flameproof housing is not permitted.
Installation Requirements: Priority vertical installation, electrical compartment prohibited from facing downward. Supply pipeline shall be equipped with a 3 μm filter with differential pressure alarm. Signal cables shall be laid separately with independent shielding, single-point grounded.
Usage Precautions: Must be used with a certified intrinsically safe barrier. The flameproof housing must not be opened while energized. The flameproof surfaces must not be damaged during installation.
