Exhaust valve of gas piston engine with protective coating

RU244438U1Active Publication Date: 2026-06-30NOT PUBLISHED
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Patent Information

Application Number
RU2025121306U
Authority / Receiving Office
RU · RU
Patent Type
Utility models
Current Assignee / Owner
Filing Date
2025-08-01
Publication Date
2026-06-30
Estimated Expiration
2035-08-01

AI Technical Summary

Technical Problem

Existing exhaust valves in gas piston engines suffer from high-temperature corrosion and mechanical wear due to prolonged exposure to combustion products, leading to reduced service life, despite using heat-resistant steels like 45Kh14N14V2M, and previous nickel-based alloys offer limited improvements in strength and durability.

Method used

Applying a protective coating composed of Cr 25-33%, W 10-14%, C 1-3%, Ni 3-12%, Fe ≤5%, Si ≤2%, Mn ≤2%, Mo ≤1%, and Co (remainder) on the valve's critical surfaces to enhance wear resistance and thermal stability.

Benefits of technology

The protective coating significantly extends the service life of the exhaust valve by preventing fatigue wear and maintaining mechanical integrity under cyclic thermal loads, with improved heat dissipation and resistance to corrosion.

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Abstract

The utility model relates to engine building, and more specifically to exhaust valves for gas piston engines. The exhaust valve of a gas piston engine consists of a stem and a head formed by a mating groove, a bore, and a seat chamfer arranged sequentially from the stem. A valve chamfer is secured to the seat chamfer. A protective coating consisting of 25-33% Cr, 10-14% W, 1-3% C, 3-12% Ni, no more than 5% Fe, no more than 2% Si, no more than 2% Mn, no more than 1% Mo, and the balance Co is provided on the surfaces of the groove, the seat chamfer, and the side edge of the valve chamfer. This coating consists of 25-33% Cr, 10-14% W, 1-3% C, 3-12% Ni, no more than 5% Fe, no more than 2% Si, no more than 2% Mn, no more than 1% Mo, and the remainder Co. This improves the wear resistance of the exhaust valve and correspondingly increases its service life. 3 fig.
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Citation Information

Patent Citations

  • Ice exhaust valve, method of its production and high-temperature alloy for its production

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  • Wear-resistant alloy for high-temperature applications

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