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> SINUS Solution For Earth Moving Machinery Engines


SINUS has extensive experience in the production of valves for earth moving machinery engines. It is a well known fact among professionals, that tractors, agricultural vehicles, and other earth moving machines engine valves, are subjected to boundary conditions that directly affect the valve’s durability and lifespan.

Over the years, O.E manufacturers gradually modified the poppet valves material and incorporate additional manufacturing processes in order to upgrade the end product.

It is clear that upgraded valves are essential to constitute beneficial cost-effective ratio between the valves price and the obtained productivity values.


Earth moving machines engines output extreme boundary conditions.

Due to multitude valves manufacturers offering various grades of replacement valves, many end users reported valves failure and engine breakdowns mainly caused due to materials incompatibility.

Many of SINUS customers address the company asking for a stable, cost-effective solution that will increase the valves lifespan and empower their durability to allow efficient valve functionality for long periods of operation, under the existing boundary conditions.


To present global consumers with a far durable product, configured of appropriate materials and incorporating additional valve strength empowering processes to assure substantially increased lifespan and optimum functionality under the extreme engine conditions to which the valve is subjected.

SINUS engineering department has set the goal to be the allocation of appropriate materials and processes that shall configure the valves fulfilling the market’s requirement perfectly, and can be offered at cost-effective prices.


SINUS engineers have allocated several materials that were found appropriate for the production of durable earth moving machines engines, some materials were predefined by O.E manufacturers.

SINUS engineering  department experimented with different metallic configurations in order to determine several winning compositions that shall constitute SINUS designated product for earth moving machinery engines.

It has been determined that for most applications within this engine category, that 21-4N or 23-8N Austenite alloy steels for the forging of the valve’s head is optimal. For the forging of the valve’s stem, SIL-1 Martensite stainless steel was targeted as the most appropriate material. AISI 4140 alloy steel was selected as an alternative to SIL-1 material.

Even though neglected by many aftermarket manufacturers and some O.E manufacturers, SINUS engineering highly recommends the plating of the valve stem with hard chrome in order to improve the valve’s wear resistance.

For the empowerment of the valves strength property, Stelite #6 facing of the valve seat area was chosen. Valve seat facing using SINUS Stelite #6 has shown hardness level of 50Hrc when tested.
The aforementioned metallic configurations selected, along with the empowerment of the valves strength property, presents a far durable set of valves able to efficiently function under the boundary conditions set by most engines in this category.

For engines that output significantly rougher conditions, SINUS engineering department offers a superior set of valves that can meet the roughest conditions placed by any earth moving machine engine.

Yet again, one of SINUS engineering goals was keeping the solution under cost-effective definition.
It was decided to replace the valves head material from Austenite steel alloy to Nickel Superalloy. SINUS engineers found Nimonic N80A and Inconel X-751 as most appropriate.

In addition to the replacement of the valves head material, SINUS engineers deiced to replace the hard chrome plating process with a chromium nitride (CrN) PVD coating. the chromium nitride coating substantially enhance the valve’s high temperatures resistance, wear resistance, improves the valve’s surface topography by creating a far smoother surface hence decreasing the friction coefficient, and sets the hardness level to 1400Hv.