Alstom VP32702X (VP327 02X) + MV7306P21 Servo Valve Assembly for Steam Turbine DEH

Product Description

The VP32702X (VP327 02X) is a high-performance two-stage hydraulic servo valve originally from Alstom (later GE Vernova), matched with MV7306P21 as the complete valve assembly. It is the core actuator for steam turbine DEH digital electro-hydraulic control system, designed for phosphate ester EH anti-flame fuel. It converts 4–20mA electric command signal into proportional hydraulic flow, precisely controlling the opening of turbine high-pressure regulating valves, realizing closed-loop speed and load regulation for thermal power units.

• Part Number: VP32702X / VP327 02X, Assembly Code: MV7306P21, Brand: Alstom / GE Vernova
• Structure: Two-stage nozzle-flapper torque motor, mechanical feedback, 4-way spool
• Control signal: 4–20mA standard analog command signal
• Working fluid: EH fire-resistant phosphate ester hydraulic oil
• Max working pressure: 16 MPa, optimized for turbine EH oil system
• Performance: Low dead zone, high resolution, fast response, anti-stiction design for long-term continuous operation
• Material: Hard alloy spool and sleeve, special seal material compatible with EH fluid
• Mounting: Standard manifold mounting pattern for steam turbine hydraulic actuator
• Certifications: CE, meets power plant DEH control specification
• Manufacturer Status: EOL legacy turbine spare; aftermarket supply: NOS surplus, calibrated refurbished units
• Typical gross weight: approx 3.6 kg, origin: France
• Matched system: Alstom / GE steam turbine DEH, 600MW / 1000MW supercritical & ultra-supercritical units

Applications

• Thermal power plant steam turbine high-pressure governing valve hydraulic actuation
• DEH system closed-loop speed, load control and primary frequency modulation
• Power plant EH oil system overhaul, spare replacement and DEH retrofit
• Coal-fired, combined-cycle turbine governing control skid

FAQ

Q: What is the relation between VP32702X and MV7306P21?
A: VP32702X is the servo valve core body; MV7306P21 is the full assembly part number including valve, manifold, connectors and test report, sold as one complete set.

Q: Can it use ordinary mineral hydraulic oil?
A: Not recommended. It is specially built for phosphate ester EH fire-resistant oil; mineral oil will cause seal swelling and valve failure.

Q: Common failure points?
A: Nozzle blockage, spool stiction, torque motor coil damage, seal aging; overhaul needs cleaning, zero/span calibration and dynamic test on servo valve bench.