Can be a passive CAM or a spring-loaded device with two or more camming pieces on a stem.
可以是被动凸轮保护器，也可以是有两个或更多凸轮装置的弹簧保护装置。
Based on customers requirement, a packing tightening design may be employed to obtain more reliable stem packing seal, which is loaded by bevelling spring.
根据用户的需要，可以采用碟形弹簧加载的填料压紧机构，使阀杆填料的密封更加可靠。
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