求翻译：球体、阀座和阀杆等是球阀的重要内件，它不仅承受介质的压力、腐蚀，而且决定球阀的密封性能和使用寿命，其材料选用至关重要。球体、阀杆多选用不锈钢材料，也有碳钢表面镀镍磷，阀座密封圈采用聚四氟乙烯（PTFE）、增强聚四氟乙烯（RPTFE）或尼龙。O形圈采用氟橡胶材料。是什么意思？

Ball, valve seat and stem ball valve inside, it is not only to withstand the pressure of the media, corrosion, and the decision of sealing performance and service life, material selection is critical. Ball, stem and more choice of stainless steel, carbon steel plated nickel-phosphorus, the valve sea

sphere, valve seats and valves are ball valves, such as lever the important part, it is not only withstand the media pressure, corrosion, and it was decided the ball valve seal performance and service life, it is essential to material to be used. Ball, stem more use stainless steel, carbon steel sur

The spheroid, the valve seat and the valve lever and so on are the ball valve important contents, not only it withstanding medium pressure, corrosion, moreover decided the ball valve the sealing property and the service life, its material selects very important.The spheroid, the valve lever select t

Spheroid, valve seat and valve stem is an important inner parts ball valve, it not only under media pressure, corrosion, and decided to ball valve sealing performance and long service life, its material selection is essential. Spheroid, valve stem select stainless steel material, there are also carb

正在翻译，请等待...