EPV-50BT Series 2

EPV-50BT Series 2 rotary electromechanism

EPV-50BT Series 2 is an aviation rotary electromechanism with limited output shaft travel. The unit is used as an electric actuator for remote control of air dampers, valves and regulating devices in aircraft air conditioning, ventilation, heating and anti-icing systems. It operates from the aircraft 27 V DC network and provides controlled angular movement of the output shaft. In the supplied context, the mechanism is mainly associated with Mi-8 / Mi-17 / Mi-171 helicopter systems.

Function of EPV-50BT Series 2

The main function of EPV-50BT Series 2 is to move an air damper or valve into the required position by electrical command. The mechanism rotates its output shaft through a fixed angle and stops at the end positions using internal limit microswitches. This allows the aircraft system to regulate or shut off air supply lines without manual access to the damper. The actuator may be controlled from cockpit switches, automatic temperature control units or anti-icing system circuits, depending on the aircraft installation.

EPV-50BT Series 2 with 1919T regulating damper

The primary associated unit for EPV-50BT Series 2 is the 1919T regulating air damper. The electromechanism is installed directly on the damper body and moves its internal rotary plate through a linkage system. The 1919T damper regulates the supply of hot air from the engines to air heating and anti-icing circuits. In Mi-8 / Mi-17 installations, this may include hot-air supply to engine inlet anti-icing circuits and related air duct systems. Exact installation should be confirmed by helicopter documentation.

Construction of the EPV-50BT Series 2 actuator

EPV-50BT Series 2 consists of an integrated drive motor, multi-stage gearbox, output shaft, end-position microswitches and a four-link lever mechanism. The built-in motor is identified in the supplied context as the D-1FT DC commutator motor. The gearbox reduces motor speed and provides the torque required to move the connected damper. The external lever mechanism transfers motion to the damper or linkage. Internal switches provide end-position cut-off and may also be used for cockpit indication of open / closed positions.

Operating conditions and tropical execution

The “T” index in EPV-50BT indicates tropical / all-climate execution according to the supplied context. This execution is intended for operation in conditions with elevated humidity, high ambient temperatures and demanding aircraft environments. The unit is also specified for a wide temperature range, which makes it suitable for installation in helicopter compartments exposed to cold air, engine heat and vibration. During maintenance, technicians should check shaft movement, microswitch operation, connector condition, linkage condition and correct damper travel.

Identification and ordering of EPV-50BT Series 2

Before ordering EPV-50BT Series 2, the buyer should confirm the aircraft type, associated damper, required series, output shaft angle, connector type, condition and documentation set. It is also important to clarify whether the request is for the electromechanism only, the 1919T damper with actuator, linkage elements, mounting hardware or a complete air-control assembly. The unit may be required for anti-icing system repair, heating and ventilation system maintenance, replacement of a defective damper actuator or spare parts stock.

Product Type: Rotary aircraft electromechanism / limited-angle electric actuator
Designation: EPV-50BT Series 2
Russian Designation: ЭПВ-50БТ серия 2
Alternative Designations: EPV-50BT ser. 2, ЭПВ-50БТ 2 серии, EPV-50B, ЭПВ-50Б
Function: Remote control of air dampers, valves and regulating devices
Application / Where Used: Aircraft air conditioning, ventilation, heating and anti-icing systems
System / Installation Area: Hot-air supply lines, anti-icing air ducts, heating / ventilation dampers and regulating air shutters
Compatible Aircraft / Equipment: Mi-8, Mi-17, Mi-171 helicopters according to source context and documentation
Associated Damper: 1919T regulating air damper
Associated Systems: Engine inlet anti-icing system, dust protection unit air supply / PZU context, heating and ventilation circuits depending on aircraft configuration
Drive Type: Rotary electromechanism with limited output shaft travel
Integrated Motor: D-1FT DC commutator motor
Nominal Supply Voltage: 27 V DC
Permitted Voltage Range: 24.3 to 29.7 V DC
Nominal Current Consumption: 0.37 A
Output Torque: 68.6 kgf·cm / 6.73 N·m
Output Shaft Travel Angle: 95°
End-Position Control: Internal limit microswitches
Operating Mode: Short-time operation with fixed end positions
Operating Temperature Range: -60 °C to +80 °C
Weight Reference: Approximately 1.4 to 1.5 kg without associated damper
Construction Features: D-1FT motor, multi-stage gearbox, limit switch panel, four-link lever mechanism, output shaft and aviation plug connector
Cockpit Indication Context: Limit microswitches may provide open / closed or anti-icing system status signals depending on aircraft wiring
Climatic Execution: Tropical / all-climate execution according to source context
Related Components: 1919T damper, linkage rods, lever mechanism, mounting hardware, connector wiring and temperature regulation units depending on installation
Condition: New / As-Stored / Overhauled / Serviceable, depending on availability
Technical Documentation: Product passport, aircraft maintenance documentation, wiring diagram, connector pinout, 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.