At STYM we utilize 21 forging machines with 6 of these are fully automatic engine valve forging cells and 15 semi-automatic pressing and upsetter machinery. Our pressing machines range from 200 – 800 Tons which is used for different engine valves with different sizes.

These machineries give us a the capability to forge over 100,000 Engine valves a day and meet all our customers demands.

The most important operation in manufacturing Engine Valves is the Hot Forging process. This process consists of two sections, the electrical upsetting of the steel bar and the forging by press machine.

In the electrical upsetting process the steel bar is forced toward an anvil and with the constant pressure and electrical goes through and starts melting the the bulb and creating a bulb shaped molten steel.

The bulb shaped molten steel is quickly(less than 5 seconds) transferred in to a Die under a large press machine and the with the stamp of the press machine the initial shape of an engine valve is formed. This process is done in a temperature between 900-1100 degrees Celsius.