STEM是阀杆的意思，直通阀下面会接一个PLUG阀塞 SEAT是阀座，也叫做SEAT RING 他们一起被叫做是阀门的TRIM，阀内件 蝶阀种一般不说STEM，说成是SHAFT吧 一般直通阀里把阀杆叫做STEM 有问题给我联系吧
我什么都没有做与您,因此pleace中止打扰我。[translate] aIt is raining heavily. 沉重下雨。[translate] a然后,做饭 Then, prepares food[translate] aseat ring set for valve 供以座位为阀门设置的圆环[translate]
asleeve governing valve: equal percentage discharge characteristic Leakage class:IV class. Valve seat material:316L, valve core material:316L,stuffy stuffing material:flexible graphite, valve cover material:WCB, valve core sealing: imported rubber ring with companion flange connection 袖子治理的阀门: 相等...
aequal percentage discharge characteristic Leakage class:IV class. Valve seat material:316L, valve core material:316L,stuffy stuffing material:flexible graphite, valve cover material:WCB, valve core sealing: imported rubber ring with companion flange connection 相等的百分比放电特性漏出类:IV类。 阀门座材...