5350T.010

5350T.010 thermostatic valve in helicopter oil systems

The 5350T.010 is an aircraft thermostatic mixing valve used in helicopter engine oil systems. The unit is designed to regulate the temperature condition of lubricating oil by controlling how the oil flow is distributed between the bypass circuit and the cooling radiator. In operation, this type of valve helps the oil system reach the required working temperature after engine start and prevents excessive oil heating during steady operation. It is used as part of the oil cooling architecture where stable lubrication parameters are required for engine reliability.

Oil temperature regulation by the 5350T.010 valve

The 5350T.010 performs automatic flow redistribution depending on oil temperature. When the oil is still cold, a larger part of the flow can pass through the bypass path, helping the engine warm up without unnecessary cooling through the radiator. As the oil temperature rises, the valve gradually directs more flow through the radiator circuit. This controlled redistribution helps maintain the required thermal condition of the oil, supports stable viscosity, and reduces the risk of operating the engine with oil that is either too cold or too hot.

5350T.010 with 5349T radiator assembly

The 5350T.010 is used in conjunction with the 5349T oil radiator assembly. In this configuration, the thermostatic valve is installed in the oil line between the engine and the radiator, where it manages the flow path according to temperature conditions. Its position in the system makes it a functional control element rather than a simple fitting. The valve supports both warm-up and cooling phases of the engine oil cycle and allows the radiator to work only when the oil temperature reaches the required operating range.

Application of 5350T.010 on Mi-8MTV, Mi-17 and Mi-24

The 5350T.010 is applied in helicopter powerplant systems, including Mi-8MTV, Mi-17, and Mi-24 platforms equipped with TV3-117 family engines. These helicopters operate in a wide range of ambient temperatures, flight profiles, and engine load conditions, so the oil cooling system must respond reliably to changing thermal demand. The thermostatic valve helps keep the lubrication system within the correct range during engine start, ground operation, hover, climb, cruise, and high-load conditions. Correct valve operation is important for the service life of the engine oil system and connected assemblies.

System integration of the 5350T.010 thermostatic valve

In the aircraft system, the 5350T.010 works together with the engine oil pump, oil lines, radiator assembly, filters, and system monitoring equipment. The valve must provide predictable movement of the regulating element as oil temperature changes. Since it is installed in a pressurized oil circuit, the condition of sealing surfaces, body integrity, and internal cleanliness is important. Contamination, sticking, deformation, or incorrect installation can affect oil flow distribution and reduce the efficiency of the cooling system. For this reason, replacement should be performed according to the aircraft and engine maintenance documentation.

Identification and supply of 5350T.010

The product is identified by the designation 5350T.010 and should be checked against the aircraft parts catalog, engine documentation, and radiator assembly configuration before procurement. The same helicopter type may have differences depending on modification, production series, installed engine, and oil cooling arrangement. When ordering the valve, it is important to confirm whether the requirement is for the thermostatic valve only or for a larger radiator assembly that includes the valve. Aviation supply should include the appropriate passport, manufacturer documentation, and confirmation of condition, service life, or storage status where applicable.

Product Type: Aircraft thermostatic mixing valve
Designation: 5350T.010
Function: Automatic regulation of oil temperature by redistributing flow between bypass and radiator circuits
Application / Where Used: Engine oil systems of helicopters
System / Installation Area: Oil system between engine and oil radiator
Part of System / Included in Set: Radiator assembly 5349T
Compatible Aircraft / Equipment: Mi-8MTV, Mi-17, Mi-24 helicopters; TV3-117 engine family
Working Medium: Aircraft engine oil, including B-3V, MS-8P or approved equivalents for TV3-117 systems
Temperature Range, Opening Start: Approx. +70…+75 °C
Temperature Range, Full Opening: Approx. +85…+90 °C
Flow Capacity: Corresponds to nominal oil flow of TV3-117 engine oil systems
Material: High-strength aluminum alloy
Installation Function: Flow redistribution between radiator and bypass oil lines
Service Life: Defined by manufacturer and specified in individual product passport
Technical Documentation: Product passport and manufacturer specifications

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