MVD4E6K

Function of MVD4E6K in aircraft systems

The main function of MVD4E6K is remote opening and closing of aircraft pipeline equipment. The mechanism receives a command from the cockpit or control circuit, rotates the output shaft through a fixed angle and stops at the end position. Built-in limit switches disconnect the motor when the valve reaches the required position. This allows the aircraft system to control fuel, hydraulic or air lines without direct manual access to the valve body. The mechanism may also provide position indication signals for “Open” and “Closed” cockpit lamps.

MVD4E6K with 771700MA fuel shut-off valve

The supplied context identifies 771700MA as a fuel shut-off valve with electric actuation, where MVD4E6K is the executive drive. In this assembly, the electromechanism physically rotates the valve element inside the fuel valve by command from the aircraft control system. The 771700MA valve is used in low-pressure fuel lines and is associated with aircraft such as Yak-42, An-148, Be-200ChS and M-101T according to the supplied context. Exact applicability must be confirmed by aircraft fuel system documentation.

Installation areas of the MVD4E6K actuator

MVD4E6K may be installed directly on compact shut-off valves placed in fuel, hydraulic or air pipelines. In the 771700MA context, the valve is mounted in low-pressure fuel lines, often in center wing section technical compartments or near auxiliary power unit fuel supply areas. On Yak-42 aircraft, the supplied context mentions use in APU fire shut-off and emergency APU fuel supply circuits. Since the installation depends on the aircraft type and fuel system layout, the location must be verified by maintenance manuals and aircraft equipment lists.

Construction and indication logic

The MVD4E6K mechanism consists of a compact electric motor, reduction gear, travel-limiting elements and an end-position signaling unit. The drive rotates the connected valve through a fixed angle, while internal limit switches stop the motor at the end positions. Separate microswitches may be used for external cockpit indication, allowing “Valve Open” or “Valve Closed” signals to be displayed. Some executions may also include a mechanical position indicator or manual backup element for emergency operation when aircraft power is unavailable.

Identification and ordering of MVD4E6K

Before ordering MVD4E6K, the buyer should confirm whether the requirement is for the actuator alone or for the complete 771700MA valve assembly with actuator. It is also necessary to confirm the aircraft type, system, operating medium, connector type, required documentation and condition category. The unit may be required for fuel system repair, replacement of a defective shut-off valve actuator, aircraft maintenance stock or restoration of low-pressure pipeline control equipment. Passport, test records, connector condition and position signaling operation should be checked before shipment.

Related equipment: 771700, 771700MA, MVD4E15B. These links are grouped by function and system context and do not indicate interchangeability.