Overheating lengthens valve stems which prevents proper seating of valves.
气门过热增加气门杆的长度，使得气门不能正常磨合到位。
Primary uses for wrot brass are for ball valve stems and balls, and iron valve stems. a forging grade of brass is used in ball valve bodies and pieces.
黄铜的主要用途是球阀阀杆和球体，和铸铁阀门的阀杆。可锻黄铜可用于球阀阀体和断口部件。
The CAM slots (112) in the CAM bars (102) are profiled such that the CAM followers (106) affect the speed and force at which the valve stems (110) travel.
所述凸轮条(102)中的所述凸轮狭槽(112)经成型以使得所述凸轮跟随器(106)影响所述阀杆(110)行进的速度和力。
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