Thanks to our long experience in the OE market from today Freccia is able to offer sodium filled valves also for its aftermarket customers.
This technology, originally used for racing applications, is constantly gaining market shares for passenger cars due to the increasing need of reducing CO2 emissions by producing downsizer turbo engines that suffer for higher stress level on thermal part, mainly intake and exhaust valves. This feature reduces the operating temperature up a maximum of 100° C.
Sodium filled valves represent the latest discovery aiming at granting the durability of the valve train and are produced by drilling the valve stem and inserting a sodium bar allowing to dissipate the heat generated in the combustion chamber through the stem, the head and the seat.
Our part numbers included in this new premium range are:
R8075/BMARNACR (oe VW 06D 109 611H – 06D 109 611H)
R8076/BMARNACR (oe PSA 0949.E2)
In case sodium filled valves are to be examined or large quantities are to be disposed of, the cavity is to be opened either by drilling holes in two different points without using coolant, or through splitting the valve open in the middle.
Handling, machining and cutting open of sodium filled valves requires special care and great consideration. It must be ensured that the cavity is not opened or broken by mistake, as sodium reacts strongly with water or drilling and grinding emulsion. When sodium reacts with water, hydrogen and caustic soda are produced, which may result in an explosion.
After this preparation, the valves are individually thrown into a bucket with water to render the sodium harmless. Once the reaction is over, the valves can be scrapped as normal. Disposal of the remaining caustic soda occurs according to the respective local regulations.
Because of the possible release of hydrogen during reaction of sodium with water, this procedure and the subsequent disposal should be performed in well ventilated rooms or outside, away from flammable liquids. Contact with skin or eyes must be avoided. For this reason, sodium must only be handled by respectively trained personnel wearing corresponding protective clothing (rubber gloves, shatter-resistant eye protection, etc.). The usual safety provisions when dealing with aggressive and caustic materials and explosive gases are to be observed.