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By certification 
Metal seated ball and seat is our key product. The core competence is our lapping technology. We are constantly improving the lapping process. Our original lapping machines are used to solve the problem of quality instability which is lapping by manual. The fully automatic lapping machine can obtain the minimum roughness to assure the “zero leakage”, guaranteed with alcohol test and kerosene test.
Size: |
NPS 1/2”-20” (DN15~500) |
Pressure Rating: |
Class 150~2500 (PN16~420) |
Base Material: |
Ferrite Steel: ASTM A105, A350 LF2, |
Surface treatment: |
Tungsten Carbide (TCC) |
Roundness: |
0.01~0.02 |
Roughness: |
Ra0.2~Ra0.4 |
Coaxiality: |
0.03~0.08 |
Thickness: |
120~350µm |
Hardness: |
900~1400HV |
http://www.qzvalveball.com/
