MOOG G771K227A Two-Stage Mechanical Feedback Electro-Hydraulic Servo Valve

Product Description

The G771K227A is a Moog G771K series intrinsically safe two-stage mechanical feedback (MFB) servo valve. It adopts nozzle-flapper pilot stage structure, receives analog control signal to adjust hydraulic flow direction and flow rate, realizing closed-loop control of hydraulic cylinder position, speed, pressure and force. It is widely used in power generation, test bench and offshore hydraulic systems. This original model is obsolete and its replacement model is G771K292A.

Features

• Part No: G771K227A, Brand: Moog
• Two-stage mechanical feedback (MFB) design, analog signal control
• Intrinsically safe version (K suffix), suitable for hazardous explosive areas
• Low hysteresis, high resolution, fast dynamic response, good repeatability
• Working pressure up to 210 bar (3000 psi), 4-way hydraulic control
• ISO 02 standard installation interface, easy to install on manifold
• No built-in drive electronics, matched with external servo amplifier
• Can be overhauled and repaired, suitable for long-cycle continuous operation
• ATEX intrinsically safe certification for power and offshore industry

Applications

• Gas turbine / steam turbine hydraulic governor and fuel control system
• Hydraulic test bench, fatigue test and material testing equipment
• Offshore platform, petrochemical hazardous area hydraulic control loop
• Metallurgical rolling mill, hydraulic press high-precision motion control
• Legacy Moog servo system spare replacement and retrofit

FAQ

Q: What is the replacement of G771K227A?
A: Direct replacement model is G771K292A, same installation size and performance level.

Q: What does the suffix K mean?
A: K represents intrinsically safe type, for explosive gas hazardous zones.

Q: Is G771K227A discontinued?
A: Yes, original production stopped, only available as surplus, refurbished tested spare parts.

Q: What is the difference between G771K and G761 series?
A: G771K is intrinsically safe version optimized for power industry; G761 is general high-performance servo valve without intrinsic safety option.