EPV-150MT Series 2

Valve and damper control with EPV-150MT Series 2

The main task of the EPV-150MT Series 2 is to rotate the driven mechanism to the required end position. In aircraft systems, this usually means opening or closing a shut-off valve, moving a damper, or changing the position of a flow-control element. The actuator is set for a working movement close to a right-angle turn, which is typical for many aircraft valves and dampers. The short operating time makes it suitable for circuits where the system must react quickly, especially in fuel shut-off, fire protection, or hot-air control applications.

EPV-150MT Series 2 with 768600MA and 1919T

The EPV-150MT Series 2 is often used together with the 768600MA fire shut-off fuel valve and the 1919T air control damper. With the 768600MA valve, the actuator rotates the shut-off element to stop fuel flow in an emergency or commanded shutdown mode. With the 1919T damper, it moves the air-control element in pneumatic or anti-icing circuits, including hot-air supply lines. In both cases, the actuator is not selected separately from the driven unit. The installation must be checked by the exact valve or damper type, mounting interface, shaft position, and aircraft documentation.

Brake and shaft locking in EPV-150MT Series 2

A key feature of the EPV-150MT Series 2 is its built-in brake. When power is removed, the output shaft is held in position and does not freely rotate under load from the controlled medium. This is important for fuel valves and air dampers, where pressure, vibration, or airflow could otherwise try to move the mechanism away from its commanded position. The brake helps keep the valve or damper stable after the actuator has completed its travel. For maintenance, this means the unit should be checked not only for movement, but also for holding ability after power removal.

Electric motor and control layout of EPV-150MT Series 2

The actuator uses a reversible DC motor of the D-14FT Series 2 type and works from the aircraft DC power supply. The power circuit is built as a two-wire system, which provides reversible control of the direction of rotation. The design does not include built-in radio-interference suppression, so any system-level interference protection must be considered through the aircraft wiring and equipment layout. Inside the motor, electrical contact to moving parts is provided through carbon brushes. Brush condition, motor response, and travel time are practical points to check during service.

Aircraft use of EPV-150MT Series 2

The EPV-150MT Series 2 is widely used on Mi-8 and Mi-17 family helicopters and may also be found on aircraft such as An-24, An-26, An-30, Tu-134A, and M-101T, depending on the installed system. On helicopters, it is commonly connected with fuel shut-off valves, hydraulic equipment, pneumatic circuits, and anti-icing or heating system dampers. On fixed-wing aircraft, it may be used in fuel, fire protection, air heating, and anti-icing circuits. The exact installation must always be confirmed by the aircraft parts catalog and system documentation.

Ordering and inspection of EPV-150MT Series 2

When ordering the actuator, the full designation EPV-150MT Series 2 should be stated, along with the required version if the mounting dimensions or mass differ. It is also important to clarify whether the actuator is required separately or as part of an assembly with a valve or damper. Before installation, technicians normally check the housing, output shaft, mounting points, connector, motor operation, full travel time, brake action, and documentation. Since this actuator works with safety-related systems, replacement by a visually similar unit without documentation confirmation is not a good practice.

Related system equipment: 1919T, EPV-50BT Series 2, SO-121VM ver. A. These positions are grouped by system function and installation context, not as interchangeable replacements.