Stellite bearings for hinge pin. A sturdy disc hinge moves on four Stellite bearings, supporting the hinge pin and preventing binding.

• 起着销钉作用的钨铬钴合金轴承。在四个钨铬钴合金轴承上移动的坚固的阀瓣铰链,支撑着销钉,并且避免粘着。