... . German spectral spark direct-indicating spectrometer 10. Testing 11. Digital intelligent supersonic detector 12. American fluorescence magnetic-powder detector 1. Name ... class: 150LB, 300LB, 600LB, 900LB, 1500LB, and 2500LB 3.Type: Welding neck(WN) , Slip-on(SO) , Threaded(TH) , Socket ... -welding(SW) , Blind(BL) , Orifice flange (OF),or by customers' drawings ...