Meggitt C422855 EMA Fuel Gas Metering Valve Unit

Module Feature

C422855 is Meggitt (Whittaker Controls) electromechanically actuated globe-style fuel gas metering valve. It adopts EMA electric actuator instead of traditional hydraulic/pneumatic actuation, delivers high repeatability flow regulation for turbine fuel gas. Flange specification is 1-1/2 inch ANSI B16.5 Class 600 raised face. It can stably control fuel gas flow under high line pressure, support closed-loop speed/load control of gas turbine. Widely used for aero-derivative gas turbine generator sets, oil and gas compression power units. This series has variants C422855‑1 / C422855‑2 / C422855‑3 for different stroke and feedback configurations.

Working principle

DC control signal drives EMA servo actuator to lift the valve plug linearly. The plug and valve seat form variable flow area, adjusting gas flow rate proportionally with actuator position. Built-in position feedback sensor sends valve opening signal back to turbine control system for closed-loop regulation, maintains stable air-fuel ratio under varying load conditions.

Onboard components

EMA electromechanical servo actuator, position feedback transducer, globe valve body, matched plug & seat trim assembly, Class600 flange body, internal pressure sealing assembly, terminal junction box.

LED indicators

No built‑in LED indicators. Running status and valve position are read from turbine control system or matched servo controller.

Hardware self‑diagnosis

Valve body itself has no self-check circuit. Upper turbine controller monitors feedback deviation, actuator out-of-range, drive current over-limit to judge jamming, seal leakage or sensor fault.

Programming software

No dedicated configuration software. Valve stroke calibration and control loop tuning are completed in gas turbine control system.

Electrical & Process Parameters

Model:C422855 Brand:Meggitt (Whittaker Controls) Device type:EMA Fuel Gas Metering Globe Valve Flange:1‑1/2" ANSI B16.5 CL600 RF Control voltage:90~200 VDC Max line pressure:1120 psig Fluid temperature range:0~300 ℉ Actuation:Electromechanical EMA Function:Precise fuel gas flow regulation for aero-derivative gas turbine

Mechanical & Structure

Mounting:Flange connection inline process piping Protection class:Industrial heavy-duty gas service Housing:Forged alloy steel globe valve body

Environmental

Operating temperature:-20℃ ~ +149℃ Storage temperature:-40℃ ~ +150℃ Ambient humidity:5~95% non‑condensing Certification:Compliant with gas turbine fuel control industry specification Status:Meggitt original gas turbine fuel control spare valve

Installation

Install inline on fuel gas pipeline, follow flow direction marking. Torque flange bolts per CL600 standard, perform hydrostatic and leak test. Wire EMA actuator and position feedback shielded cable to turbine control cabinet. Complete stroke calibration and fuel curve commissioning before turbine start-up.

Interface1-1/2" CL600 RF process flange, electrical terminal box for actuator and LVDT feedback.

Diagnostic

Flow unstable:Trim erosion, gas impurity blocking seat or feedback sensor drift. Cannot reach full stroke:Actuator mechanical binding, control signal out of range. Leakage through valve:Seat damage from debris, require overhaul and regrind trim.

Product Brief

Meggitt C422855 EMA fuel gas metering globe valve, 1.5 inch Class600 flange, 90‑200VDC electromechanical actuation, precision fuel regulation valve for land aero-derivative gas turbine power generation and oil & gas drive systems.