Product Overview
The Moog 312A6077P007 belongs to Moog’s 31 series mechanical feedback servo valve. It is a two-stage, double-nozzle flapper electro-hydraulic flow control servo valve, widely used as a critical control component for steam turbine governor systems. Featuring an integrated torque motor and sealed stainless steel valve body, this unit delivers ultra-precise flow regulation, low hysteresis and fast dynamic response under high pressure and vibration environments. It converts analog electrical command signals into proportional hydraulic output flow for closed-loop position, speed and pressure control of rotating machinery.
Core Technical Specifications
- Part Number: 312A6077P007
- Series: Moog 31 Series, two-stage mechanical feedback servo valve
- Design: Double nozzle-flapper pilot stage, 4-way main spool
- Rated supply pressure: Up to 310 bar (4500 psi)
- Input signal: Analog current signal for torque motor
- Construction: Stainless steel valve body, environmentally sealed torque motor compartment
- Dynamic performance: High frequency response, low threshold & low hysteresis
- Mounting: Standard hydraulic manifold mounting
- Connector: Military-style round electrical connector
Typical Industrial Applications
- Steam turbine speed & load control systems
- Power generation turbine governing and excitation hydraulic loops
- Heavy-duty hydraulic test benches
- Precision metal forming and material fatigue test equipment
- Petrochemical high-accuracy hydraulic actuation systems
Installation & Maintenance Notes
- Use only filtered hydraulic fluid; keep fluid cleanliness at NAS 1638 Class 6 or better to prevent nozzle blockage
- Avoid mechanical shock during handling and installation; the internal flapper assembly is extremely delicate
- Perform null adjustment after valve replacement or system overhaul
- Keep electrical connector sealed against moisture and oil contamination
- Schedule periodic oil sampling and filter replacement to extend servo valve service life
Troubleshooting Tips
- No hydraulic output: Inspect torque motor coil continuity, supply pressure and filter clogging
- Drift / zero shift: Check fluid contamination, perform null recalibration
- Slow response or oscillation: Verify fluid viscosity, check for internal debris blocking nozzles
- Unstable control: Examine grounding of analog signal wiring and hydraulic supply pressure ripple
