Functional Features:​ Fully electric drive with no hydraulic oil source or associated hydraulic system, fundamentally reducing system complexity and maintenance costs; brushless DC motor with samarium cobalt permanent magnets, all stator windings fully encapsulated; high-precision brushless resolver as a non-contact position feedback element directly coupled to the valve body metering sleeve; motor-integrated resolver provides rotor position feedback, with an additional resolver providing output shaft position feedback; built-in slip clutch allows full-speed impact against optional external rigid mechanical stops, protecting the motor shaft and gearbox; the clutch slips at 1.5 times the maximum output force of the motor/gearbox assembly; fault detection circuitry comprehensively monitors the 4-20 mA interface, position controller, driver, and feedback status; upon fault or external shutdown command, the motor power is automatically cut off and the valve closes to the minimum fuel position via the internal spring; analog driver receives 4-20 mA demand signal; digital driver exchanges 16-bit digital position data with NetCon/MicroNet systems via serial communication; flameproof cast aluminum enclosure compliant with ATEX Category 2; CSA certified for Class I, Division 1, Groups C, D; Class I, Division 2, Groups B, C, D (NRTL/C); LCIE Zone 1 Group IIB; valve body compliant with Pressure Equipment Directive (97/23/EC) Category II; self-cleaning metering structure specifically designed for sour gas (acid gas) environments.

Application Scenarios:​ Standard configuration for industrial gas turbine fuel metering and regulation systems; installations without hydraulic oil sources or where hydraulic oil use is prohibited; gas turbine systems with high requirements for clean operation and low maintenance.

Material Composition:​ Valve body in stainless steel; internal moving parts in fully hardened stainless steel; actuator housing in cast aluminum flameproof enclosure; motor rotor with samarium cobalt permanent magnets bonded and encapsulated; resolver with non-contact electromagnetic induction structure; coupling in stainless steel torsional coupling.

Structural Features:​ Planetary gear reduction EM35MR actuator directly coupled to the 3103 valve body; resolver coupled to the metering sleeve; built-in slip clutch; dual resolver configuration (motor resolver + output shaft resolver).

Working Principle:​ The electronic controller sends a position command to the EM35MR driver. The driver energizes the brushless DC motor with samarium cobalt permanent magnets, producing precise rotation. The planetary gear reduction amplifies the torque and drives the 3103 valve’s metering sleeve. The motor-integrated resolver provides commutation feedback, while the output shaft resolver provides position feedback directly from the metering sleeve, forming a closed-loop digital control system. Upon fault or power loss, the internal spring forces the valve to the minimum fuel position.

Installation Requirements:​ Bolt the flameproof cover plate to specification torque; use explosion-proof cable glands and conduit sealing; ensure proper system grounding; provide 25 μm absolute filtration for the gas inlet; verify the gas inlet pressure does not exceed the rated value (6205 kPa gauge enhanced, 4964 kPa CE limited).

Usage Precautions:​ Do not coil the motor cables; perform maintenance with power disconnected in hazardous areas; regularly inspect cable connections; never adjust the mechanical stops; the clutch slips at 1.5 times the maximum output force of the motor/gearbox assembly, do not remove this protective function; check flexibility after prolonged shutdown.