气门导管，气门座圈，气门锁片，气门弹簧座，铸件系列。
Valve Guide, Valve Seat, Valve Lock, Valve Spring Retainer, Casting Products.
阐述QD 2853起动机电刷盒弹簧座原成型模的缺陷并进行改进。
Elaborates QD2853 generator electronics brush box spring place originally forming die flaw and makes improvement.
在不具备压力试验条件时，不允许拆掉换向阀的铅封和调整调压弹簧座。
In the lack of condition for the pressure test, it is not allowed to remove the lead sealing of the reversing valve to adjust the pressure regulating button.
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