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。
The spring return pneumatic actuators use an air supply to drive the valve stem in one direction and an internally loaded spring to return to the valve to its original position.
春季返回气动执行机构使用的空气供应，以推动一个方向阀杆和一个内部装载弹簧返回到原来的位置阀门。
The spring return pneumatic actuators use an air supply to drive the valve stem in one direction and an internally loaded spring to return to the valve to its original position.
春季返回气动执行机构使用的空气供应，以推动一个方向阀杆和一个内部装载弹簧返回到原来的位置阀门。
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