All About Engine Valves

The flow of fluid or gas to and from the combustion chambers or cylinders needs to be allowed or restricted during the engine operation. This is done by internal combustion engines whose main mechanical components are engine valves. Their function is similar to many other types of valves that block or pass flow.

Another component of the engine is the rocker arm which needs to open and close in the proper sequence with correct timing. For that operation, engine valves interface with the rocker arms.Various types of fuel (e.g. gasoline, diesel, kerosene, LNG, LP) operated combustion engines have engine valves in common. Due to different placement designs, the valves are a major component for the type determination of engines and they classify engines as OverHead Valve (OHV), Overhead Cam (OHC), or Valve In Block (VIB).Now, let’s take a detailed look at engine valves


The engine valves have a conical profile valve to fit against a machined valve seat to seal the passage for fluids or gases. The valves pop up and down in motion. That is why they are designed as poppet-style valves. Also because of the shape of their head, they are called mushroom valves.

The valve mainly consists of a stem and a head. To match the machining of a valve seat, the seat is led by a fillet that is in the valve head. A valve spring provides a seating pressure against which, the valve stem needs to move. The mechanical elements of the engine operate the valve to create the force for the stem to move against the seating pressure. Those mechanical elements and the valve are connected by the valve stem

Role of Engine Valves in Engine Operation

According to participation in Engine Operation, engine valves are mainly named Intake Valves and Exhaust Valves. The intake valves are needed to be opened for allowing the air/fuel mixture to flows into the engine cylinders for compression and ignition. And the exhaust valves are needed to be opened to permit exhaust gases expulsion after the combustion process, triggered by ignition

The Engine’s camshaft drives the motion of the engine valves. From the rotation of the camshaft, the linear motion of the valve is created by a series of lobes or cams, situated in the camshaft.

The Motion of Engine Valves

The Engine’s camshaft drives the motion of the engine valves. From the rotation of the camshaft, the linear motion of the valve is created by a series of lobes or cams, situated in the camshaft.

Proper of the valves is maintained by the accurate clearance between the valve stem and the rocker arm or cam. Too large valve clearance causes the late opening and fast closing of the valves. And too small valve clearance causes incomplete closing of the valves and that will reduce the performance of the engine and will increase its noise

Materials used in Engine Valves

The main operations of engine valves require great stress and extremely high temperatures. To withstand that stress and temperature, the engine valve materials must have those capabilities to bear such high mechanical and thermal loads from engine dynamics.

The intake valves are mainly made of chrome, nickel, or tungsten steel, and the exhaust valves are primarily made of high heat resistant metals such as nichrome, silicon-chromium, or cobalt-chromium alloys.

Here atSunflag steel,we have steels specially prepared for engine valves and we have a great quality ofengine valve steel. You can check them out and can reach us for the best quality and prices.

Some Types of Engine Valves

Based on design and materials, some primary types of engine valves are –

•Monometallic engine valves.

•Bimetallic engine valves.

•Hollow engine valves

Some Specifications of Engine Valves

For the betterment and ease to decide the best engine valves, buyers should check for the following specifications –

•Stem Diameter
•Stem Length
•Seat angle
•Valve Materials

This was a summary of engine valves. Hope it will improve your knowledge about engine valves. For bestEngine Valve Steel, reachSunflag Steel.

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Sunflag Iron & Steel Co. Ltd partners Japan based specialty steel producer Daido Steel Co. Ltd.

daido steel

Sunflag & Steel Co. Ltd., manufacturers of world-class automobile Spring Steel recently announced their partnership with Japan’s leading specialty steel producer Daido Steel Co. Ltd for technical assistance regarding equipment investment and product evaluation. This partnership will enable Sunflag Iron & Steel Co. Ltd. to produce high-quality specialty steel more efficiently by receiving technical assistance from advance steel manufacturer Daido Steel Co. Ltd.

Alloy and special steel market are one of the fastest growing markets in India steered by the accelerated growth in automobile and motorcycle industry. A huge expansion supported by large investments in infrastructure industry has also raised the demand for such steels. Announcing about the tie-up, Mr. Ravi Bhardwaj, Vice Chairman, and Managing Director, Sunflag Iron & Steel Co. Ltd. said, ‘To cater to huge requirements and to keep up with expanding special steels market, Sunflag Iron & Steel Co. Ltd. has been consistently developing new grades and doing incremental investments for adding up new and up-to-date technologies for producing such special steels. This tie-up will enable us to receive technological assistance from Daido which will immensely help us in our operations. Eyeing the soaring consumer demand, most of the automobile companies are setting up their manufacturing units in India. These companies have always generated a demand for premium quality steel to produce world-class automobiles.

In the current scenario, these companies have to import steel for critical components due to their non-availability in India. Looking at the highly cost-competitive Indian market importing such steel will be uneconomical, therefore, these companies are anticipating the Indian steel manufacturers to supply quality steel for critical components.

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