Detailed Product Description Engine valve Types:Inlet valve/intake valve,exhaust valveMaterials:4Cr10Si2Mo,4Cr9Si2,40Cr,21-4NSurface: Chromium-plated, ... nitriding,white,blackProcessing methods: spray welding,nitriding,grindingSpecification:intake valve: 31.60*7.00*110.00;exhaust valve: 26 ...