Because the metal hard seal ball valve sealing surfacewith super hard material or surface hardening treatment(≥ 45 HRC / ≥ 950 HV), can not be processed by the common tools, even to the processing of the processing accuracy can not meet the requirements, it is thereforevery important tool suitable.

Spherical precision grinding generally adopts specialgrinding machine, which is mainly composed of aclamping ball rotary shaft and grinding head. A grinding head main centering flange connected by a shaft of the(Lian Jiepan), a spring floating mechanism, a clampingdisc grinding and grinding strip. Grinding according to the sphere surface treatment methods, manufacturingand can choose a variety of material oilstone sand stripor artificial diamond material.

Metal hard seal ball valve seat base material, should use the line expanding number close to the shell material ofstainless steel material, the seal hardening process can also be used manual welding or plasma spray weldinghard alloy. The final thickness of surfacing layer

Usually, the sealing surface of metal hard seal ball valveseat, in a special grinding machine using the principleand the ball planetary grinding and precision grinding,and then with the ball on one hand with the research,tested by indentation method.

Ball valve high reliability is mainly because

1), body and valve seat sealing will not happen toabrasion, sharp wear fault, not stuck at work (in the absence of lubricant), it can be reliably applied with the corrosive medium and low boiling point liquid;

2) built-in stem structure, eliminates the stem andpacking gland may fly out due to loose in a fluid under pressure accident;

3) uses ball valve and anti-static, refractory structure,suitable for conveying petroleum, natural gas, coal gaspipeline.