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1.blow-out proof stem2.investment casting body
3.full port
4.pressure blance hole in bal solt
5.all kinds of thread available
6.locking device handleavailable
7.design acc:ASME B 16.34
8.thread acc :ansi b 1.20.1
9.inspection&testing acc:api598
Skype:amy.chen518
QQ:1711394790




