Test bars are usually cast for each heat, but their analysis may be inconclusive. 测试杆通常针对每个温度,但是它们的分析可能是不确定的。
It shall have a test lever and the valve shall be guided to enhance reseating and to decrease chance of the seat being misaligned. 这种阀门配置测试杆,阀杆通过导轨引导,能够实现更好的阀座再密封,降低阀座对齐不准的可能性。