771700MA

771700MA fuel shut-off valve in aircraft fuel systems

The 771700MA is an aircraft fuel shut-off valve designed for remote control of fuel flow in onboard fuel systems. The unit is supplied with an electromechanical actuator and is installed where a fuel line must be opened or closed by command from the aircraft electrical control system. In operation, the valve allows controlled interruption or restoration of fuel supply without direct manual access to the installation point. The 771700MA is used in fuel pipelines serving propulsion systems, auxiliary systems, and other onboard circuits where reliable fuel flow control is required.

Fuel flow control function of the 771700MA valve

The main function of the 771700MA is to provide controlled opening and closing of the fuel passage. After receiving an electrical command, the electromechanism moves the valve mechanism into the required position and changes the flow condition in the pipeline. This makes the valve suitable for aircraft systems where fuel supply must be controlled from the cockpit, by system logic, or through maintenance control circuits. The unit is not a drain or service fitting; it is an active shut-off element that directly participates in the operating logic of the aircraft fuel system.

771700MA with MVD4E6K electromechanism

The 771700MA is supplied as a complete assembly with the MVD4E6K electromechanism. The actuator provides the mechanical movement required to operate the valve and is powered from the aircraft DC electrical system. This configuration allows the valve to work as a remotely controlled unit within the fuel system. For procurement and maintenance, the valve body and electromechanism should normally be treated as a matched assembly unless the request clearly specifies one component separately. The designation MVD4E6K may also appear in technical requests together with the valve designation 771700MA.

Aircraft application of 771700MA in fuel pipelines

The 771700MA is used in aircraft and helicopter fuel systems as part of fuel supply circuits for engines, auxiliary equipment, and related onboard fuel lines. Depending on the aircraft type and modification, the valve may be installed in different sections of the fuel system. Its exact application must be verified by the aircraft parts catalog, maintenance manual, and approved system documentation. For correct replacement, the valve must match the required working medium, pressure rating, electrical supply, actuator version, installation geometry, and documentation requirements of the aircraft system.

Operating conditions for the 771700MA shut-off valve

The 771700MA is intended for operation with aviation fuel in an air environment within the specified pressure and temperature limits. The valve must remain leak-tight and mechanically reliable under vibration, temperature changes, fuel exposure, and repeated actuation cycles. Before installation, the assembly should be checked for housing condition, sealing surfaces, fittings, connector condition, actuator movement, and signs of leakage or damage. Since the valve controls fuel flow, incorrect operation may affect system serviceability, fuel supply logic, and aircraft maintenance acceptance.

Identification and supply of 771700MA / MVD4E6K

The product is identified by the valve designation 771700MA and the electromechanism designation MVD4E6K. In supply documentation, the assembly should be ordered with clear reference to both designations to avoid confusion with the base 771700 version or other electromechanism variants. The valve is supplied according to approved technical documentation and should be accompanied by the relevant passport or manufacturer documents. When ordering, it is important to specify whether the requirement is for the complete 771700MA assembly with MVD4E6K, the valve only, or the electromechanism separately.

Product Type: Aircraft fuel shut-off valve with electromechanical actuator
Valve Designation: 771700MA
Electromechanism Designation: MVD4E6K
Alternative Designations: 771700MA, МВД4Е6К
Function: Remote opening and closing of fuel flow
Application / Where Used: Aircraft and helicopter fuel systems
System / Installation Area: Fuel pipelines of propulsion and auxiliary systems
Working Medium: Aviation fuel
Fuel Type: T-1, TS-1, T-2
Ambient Medium: Air
Operating Temperature Range: −60 to +80 °C
Operating Pressure: Up to 3.0 kgf/cm²
Operating Voltage: 24–29.4 V DC
Current Consumption: Not more than 3.5 A
Valve Assembly Weight: Not more than 0.95 kg
Electromechanism Weight: 0.52 kg
Completeness of Supply: Shut-off valve 771700MA with MVD4E6K electromechanism
Valve Documentation: Passport 771700MA PS
Electromechanism Documentation: Passport MVD4E6K PS
Technical Documentation: Product passport and manufacturer documentation

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