Type of Engine Valve
AN ISO/TS 16949 : 2009 Certified Comapny
Nextech offers one of the widest ranges of Intake and Exhaust Engine Valves, for internal combustion engines in range of sizes with verity of materials.

At our state-of-the-art facilities, we manufacture Engine Valves to the highest standards, serving the needs of our customers across a whole range of Automobile and Engineering industries with the latest and advanced CNC technology. Nextech Engine Valves are used in some of the most demanding applications for Automobile and Engineering Industries, including Global Automotive Industry, On and Off Road Vehicles, Marine, Locomotive as well as applications like general industrial and Stationary engines.

We provide custom design and manufacturing services for developing customized Engine Valves. Our OEM customers see significant reductions in development costs, integration costs, support costs, and time to market. With our assistance, you are free to focus on developing your core products while we develop the necessary products to support your needs.

We are committed to partnering with our customers to offer rapid development, prototyping and pilot production of Engine Valves tailored to each customer's specific needs. This unique team approach enables a speedy yet thorough process development cycle. Customers can gauge production worthiness, timelines, and eliminate risk before production while gaining a realistic evaluation of costs. Companies also able to get material, data and process information in a timely fashion to meet aggressive schedules and requirements of higher tier clients.

Material Selection
The multiple stresses of the material in the valve are being met with a few standardized grades and specific ways of manufacture. The path of the material from bar stock to the finished valve is being followed. Engine development in the past decades increased the load on the valves which could be met by continuously developing their structural strength. Also the strength of all valve materials could be raised to nominal strength above 1100 Mpa by applying specific methods. Higher strength at the surface is being effectuated by work hardening effects. The technology to increase reliability of valves and new aspects of valve seat facing including residual stress is explicitly consider while manufacturing valve.

Range of Engine Valves

Monometallic Valves
Valve built of a single material that forms the stem and the head. They possess excellent mechanical properties although they are not so good at corrosion. Chromium-nickel-manganese- tungsten stainless steels are used for exhaust valves.
Bimetal Valves
Valve made by joining together two different valve materials by friction wielding wherein high hot hardness alloy steel (austenitic steel) is used at the head and the stem made from a upright mechanical properties steel (martensitic steel). In this way a better usage of the properties of each material is achieved, high temperature corrosion resistance in the austenitic stainless steels of the head, and high tensile strength and abrasive wear resistance in the martensitic stainless steel of the stem. This technique is used in medium to high stressed exhaust valves and in high stressed intake valves.
Monometallic Valves
A small piece of martensitic steel is welded on the stem end when the entire valve is manufactured in stainless steel (non-quenchable). This is done to increase the impact and wear resistance of the stem end. Then, this tip is quenched to improve their mechanical properties.
Stellied Welded Valve
(Special alloys welded onto the seat)
To improve the corrosion and high temperature wear resistance, mainly in exhaust valves, a cord of special material is placed onto the valve seat. Valves made by using deposit of stellite to get high hot hardness at the seat. The special material is generally a cobalt base alloy (called Stellite), although it can also be iron or nickel base.
Chrome Plate Valve
Through an electromechanical process a layer of hard chromium is stored over the stem. The thickness of this layer generally will depend on the level of the piece stress. The main function of the chromium layer is to reduce the friction between the stem and the valve guide, and to store among its micro-cracks, small amounts of lubricating oil. All this results in better operating conditions increasing. Therefore the useful life of the valve guide and stem
Nitrate Valve
Nitride Engine Valve with the ultimate solution for valves that are intended for use in highly corrosive environment.

The Nitride coating will substantially reinforce the valve’s corrosion resistance property and enable highly durable valve performance.
The tuffen Nitride Process will also provide enhancement to the valve’s wear resistance property, significantly increase the valve’s lifespan, and improve the valve stem friction coefficient to allow decreased friction between the stem and the valve guide.

Nextech recommends on Nitride coating for valves that are due to perform in extremely high corrosive environment, be it for any kind of engine that outputs such conditions.

The Nitride coating is presented in Grey and black color.
Valve Manufacturing Facility
Type From To
Stem Diameterd 5.0 mm 25.0 mm
Head Diameter D 20.0 mm 130.0 mm
Overall Length L 60.0 mm 400.0 mm
 
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