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Engine Valve
Engine Valve Guide
Engine Valve Seat
Engine Valve
   
  ENGINE VALVES
Two different types of valves are used in internal combustion engines. The valves called Intake engine valves let fresh air /fuel mixture get into the cylinder by opening and closing the intake port. The valves called exhaust valves let exhaust gas evacuate out of the cylinder by opening and closing the exhaust port.

SPECIAL PURPOSE VALVES
A/S :BI METAL VALVES

Exhaust valves are especially made from bi-metal. The valves heads which sustain corrosion, deterioration, mobile and mechanical forcement are made of austenitic steel and the stems of the valves are made of martensitic steel because bi-metal lengthens valve running time.

Na: VALVES FILLED WITH SODIUM
The insides of some valves are filled with sodium so that its heat can be decreased for the engines which run with high speed in hard conditions for a long time so the possibility of crack, corrosion and distortion decrease.

Ni: NITRETED VALVES
Some valves are applied by nitration process so that their deterioration and corrosion resistance increase. Nitrated plate on the valves is non-fragile and doesn’t fall into decay. Fatigue time can be increased till % 80 on high alloy steel and % 40 on steel chrome - nickel portion % 8-18 by nitration. The process decreases friction coefficient and increases correlation resistance. Nitration decreases stickiness even if there is no lubrication. These features lengthen valve durability.

ST: STELLITED VALVES
The satellite process is applied onto exhaust valve and some inlet valve seats and stem tip ends to increase their resistance

Y: VALVES WITH HARDENED SEATS
Seats of Inlet valves are especially hardened by induction to prevent detritions

Cr.CHROME PLATED VALVES
Stem of valves are plated with chrome to increase the surface resistance and decrease the detritions. The process doesn’t only increase the stem resistance but it also decreases functional power so it lengthens valve and guide durability.

Ph: PHOSPHATE PLATED VALVES
Valves are plated with phosphate so that they can keep lubrication and be protected from corrosion.

MATERIAL USED IN VALVE:
N Alloy steel for intake valves,also used as stem material for bimetallic versions is a strong one for corrosions.

S CrSi is exhaust valve steel with high resistance to both extreme temperatures and corrosions, normally used to produce intake valves.

O (CrMo) –Steel with excellent wear resistance and with low coefficient of friction is used for high –stressed exhaust valves.

A (CrNiMn) Austenitic CrNiMn – Steel for highly stressed exhaust valves, with high resistance to both burning and corrosion is used as head material with stellite facing for bimetallic versions, also not effected by leaded fuel.

R Austenitic (CrMoMn)– Steel with outstanding wear and heat resistance as well as fatigue strength is used for highly stressed intake and exhaust valves.

I Nikel – based super alloy for large Diesel – engine exhaust valves is subjected to very high stresses.

X Austenitic Chrome Manganese – Nickel Steel with Nitrogen addition resitance to the corrosive action and high strength properties at elevated temperatures is used for exhaust valves and heavy duty inlet valves.
   
   
 
Raw Materials Used In Valve
MALZEME ALAŞIMLARI / MATERIAL COMPOSITIONS
 SİMGE / SYMBOL S A O R X
 MALZEME NO / MATERIAL NO 1,4718 1,4871 1,4748 1,4785 1,4875
 DIN X45CrSi 93 X53CrMnNIN219 X85CrMoV182 x60CrMnMoVNbN 2110 X55CrMnNIN208
 KİMYASAL ANALİZ/
 CHEMICAL ANALYSIS
% % % % %
 C 0.40-0.50 0.48-0.58 0.80-0.90 0.57-0.65 0.50-0.60
 SI 2.70-3.30 s0.25 s1.00 s0.25 s0.25
 Mn s0,80 7,00-10,00 s1,50 9,50-11,50 7,0-10,0
 P s0.040 s0.050 s0.040 s0.050 s0.050
 S s0,030 s0,030 s0,030 s0,025 s0,030
 Cr 2.00-10.00 20.00-22.00 16.50-18.50 20.00-22.00 19.50-21.50
 Mo --- 2.00-2.50 0.75-1.25
 Ni --- 3.25-4.50 s1.50 2.00-2.75
 V --- --- 0.30-0.60 0.75-1.00 ---
 W --- --- --- --- ---
 DİĞERLERİ (En Çok)/OTHERS   (Max) --- 0.38-0.50 0.20-0.40
ÇEKME MUKAVEMETİ (N/mm2) /
TENSILE STRENGTH
900-1100 950-1200 1000-1200 1000-1250 900-1150
LINEER GENLEŞME KATSAYISI
(20
°C-700°C)(cm/cm °C)X10'
LINEAR EXPANSION COEFFICIENT
13.9 18.5 12.5 18.5 18.5
       
 
 
 
 
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