back seating stem 是什么意思？

伊凡

·阀杆设计
8 ?* G( T* N8 H2 \- w( s9 _
' ~% B9 \5 K! [7 ]6 |采用整体锻造工艺制成，按照标准要求确定最小直径。
5 ?% R$ `; X9 [  ~/ L3 m
( `; D+ W3 E- n, SStem Design
* p' j' a  `- S. O2 I9 x* r8 L
7 _* f2 `1 q2 PThe stem is of integral forged design,The minimum diameter of the stem shall per the standard requirement.