MZK-2 Series 2

MZK-2 Series 2 valve closing electromechanism

MZK-2 Series 2 is a reversible aviation electromechanism of rotary action with a limited shaft travel angle. The unit is intended to drive shut-off valves and other actuating elements in aircraft, military vehicles and special equipment. Its name is commonly understood as a valve closing mechanism, and it is used where a valve must be opened or closed remotely by electrical command. The mechanism is typically equipped with a D-12TF series DC motor and a reduction gearbox that produces controlled output shaft rotation.

Rotary actuator function of MZK-2 Series 2

The main function of MZK-2 Series 2 is to turn the output shaft through a limited angular range and hold the connected valve or actuator in the required position. The mechanism receives power from a 27 V DC system and drives the internal motor and gearbox. The output torque is transferred to the valve spindle, lever or shut-off device. This allows remote control of fuel, hydraulic or air system valves from the cockpit, control panel or automation circuit, depending on the equipment where the mechanism is installed.

MZK-2 Series 2 in fuel, hydraulic and air systems

MZK-2 Series 2 is used in systems where reliable remote shut-off is required. In aviation applications, it may operate fuel shut-off valves, fire shut-off valves, crossfeed valves or other valve units installed in aircraft fuel systems. It may also be used in hydraulic and pneumatic circuits where a valve or flap must be moved by electrical command. The mechanism is associated with aircraft such as An-24, An-26 and Il-76 in source context, but exact applicability must be confirmed by the aircraft equipment list and valve assembly documentation.

Construction of the MZK-2 Series 2 mechanism

The mechanism consists of a DC motor, multi-stage cylindrical gearbox, output shaft, friction torque-limiting clutch and a block of limit switches. The D-12TF-2s motor, or a similar DC motor depending on execution, provides rotary input to the gearbox. The gearbox reduces speed and increases torque at the output shaft. The friction clutch protects the mechanism and the driven valve from excessive load. Built-in limit switches disconnect motor power when the shaft reaches the end positions, preventing continuous drive after travel completion.

Operating range and mechanical limits

MZK-2 Series 2 is designed for repeated short-time operation. The output shaft travel is limited to a fixed angle, with source data indicating 95° ± 3°. The mechanism produces output torque sufficient for operation of aircraft shut-off valves and related equipment. The source context gives a nominal torque of 250 kgf·cm and a maximum stall torque reference up to 450 kgf·cm. During maintenance, technicians should check shaft travel, limit switch operation, clutch condition, connector contacts, current consumption and mechanical backlash in the drive.

Identification and ordering of MZK-2 Series 2

Before ordering MZK-2 Series 2, the buyer should confirm the required series, output shaft configuration, connector type, operating voltage, angle of rotation, torque requirement and documentation set. It is also important to specify whether the unit is required separately or together with a shut-off valve, fuel valve, hydraulic valve or air valve. The mechanism may be required for aircraft maintenance, fuel system repair, special vehicle overhaul, stand equipment or stock replenishment. Passport, year of manufacture, storage condition and test records should be agreed before shipment.

Product Type: Valve closing electromechanism / reversible rotary actuator
Designation: MZK-2 Series 2
Russian Designation: МЗК-2 серия 2
Alternative Designations: МЗК-2 2 серии, MZK-2 2nd Series, MZK-2-2, МЗК2-2с, MZK2-2s
Function: Remote opening / closing of shut-off valves and rotary actuating elements
Application / Where Used: Fuel, hydraulic and air systems of aircraft, military vehicles and special equipment
System / Installation Area: Fuel shut-off valves, fire shut-off valves, crossfeed valves, hydraulic valves, pneumatic valves and remote shut-off assemblies
Compatible Aircraft / Equipment: An-24, An-26, Il-76 and other aircraft or special equipment according to source context and documentation
Associated Equipment Examples: 762700M crossfeed valve; U6100-40M valve, according to source context
Drive Type: Reversible rotary electromechanism with limited output shaft travel
Integrated Motor: D-12TF / D-12TF-2s DC motor or similar depending on execution
Nominal Supply Voltage: 27 V DC
Permitted Supply Voltage Range: 24 to 29.4 V DC
Current Consumption: Not more than 3.6 A at nominal torque
Nominal Output Torque: 250 kgf·cm / 24.5 N·m
Maximum Stall Torque Reference: Up to 450 kgf·cm
Output Shaft Travel Angle: 95° ± 3°
Operating Time for Full Travel: 4 to 10 seconds depending on load and supply voltage
Duty Mode: Intermittent / repeated short-time operation
Length Reference: 212 mm; up to 257 mm with connector and shaft projection, according to source context
Width Reference: 103 to 107 mm depending on measuring points
Height Reference: 62 to 70 mm
Weight Reference: Approximately 2.15 kg; up to 2.8 kg depending on configuration and attached equipment
Construction Features: DC motor, multi-stage cylindrical gearbox, friction torque-limiting clutch, limit switch block and plug connector
Travel Limitation: Built-in limit switches disconnect power at end positions
Category: Aviation electromechanism / special equipment actuator
Condition: New / As-Stored / Overhauled / Serviceable, depending on availability
Technical Documentation: Product passport, wiring diagram, aircraft or equipment maintenance documentation, test records and inspection documents if available

All shipments are carried out from our international warehouse in Dubai (UAE), as well as from our partners’ remote warehouses.

In Stock — items available in stock at the Dubai warehouse are dispatched within 5–10 business days after receiving 100% prepayment.

Remote Stock — items available at our partners’ remote warehouses are supplied within an average of 30–45 business days after receiving 100% prepayment.

Pre-Order — made-to-order products are manufactured and delivered within an average of 45–60 business days. Payment terms: 50% advance payment to start production, with the remaining 50% paid before dispatch from the Dubai warehouse after full readiness for shipment.

Returns & Changes (Restocking Fee)
For selected items, a RESTOCKING FEE of 10% may apply in case of return, order cancellation, or changes to the order specifications. This condition applies only to certain products and is confirmed at the order approval stage.

Warranty
All products are covered by a standard 6-month warranty.
Extended warranty is available upon request and is agreed individually; it may affect the final product price.