Generally Raw Material:

Intake valve: 4Cr9Si2

Exhaust valve: 21-4N, 21-4N+4Cr9Si2, also customized. 

Material Especially for Marine valve spidles:

1. Si-Cr (4Cr10Si2Mo)

2. Ni-Cr-Mn-N (23-8N)

3. Ni-Cr-W (SNCRW)

4. NI (NI80A)

Harden process for valve seats' surface:

1. High frequency quenching

2. High alloy welding

Harden process for valve stem:

1. Chrome-plating

2.Nitriding

3.Quenching/Spray welding 

Simple dimension arrange of our valves:

d: 10-100mm

D: 45-500mm

L: 120-1787mm 

Advantages:

High Attrition and Temperature Endurance

High Erosion and Concussion Endurance

Good hardness, wear

ENGINE		IN       EX	O.E.M   NO.	MATERIAL  DIMENTIONS
TYPE	CYL			HD	SD	OL
JEEP  5/G	4	IN		48.50	8.0	124.80
		EX		38.00	8.0	125.50
JEEP  5/G             BJ213	4	IN	33003515	48.50	8.0	125.10
		EX	33003517	38.00	8.0	125.20
Chrysler           2.5long	4	IN		41.00	8.0	114.30
		EX		35.40	8.0	114.90
Chrysler        3.0	6	IN		43.00	8.0	103.00
		EX		35.00	8.0	103.00
Chrysler          3.3	6	IN		45.50	8.0	125.70
		EX		37.50	8.0	126.30
Chrysler          3.5  24V	6	IN		35.00	7.0	114.70
		EX		29.00	7.0	126.00
NEON                     2.0	4	IN		33.30	6.0	114.90
		EX		28.70	6.0	117.20
PT2000                 AFTER2001	4	IN		34.60	6.0	111.75
		EX		28.30	6.0	109.75
Chrysler       3.5  after 2001	6	IN		36.50	7.0	114.70
		EX
BJ Jeep2.7	4	IN	53010512AA	48.50	8.0	124.80
		EX	53010513AA	38.10	8.0	125.45
Grand Cherokee4.0	6	IN	53010512AA	48.50	8.0	124.80
		EX	53010513AA	38.10	8.0	125.45