threaded valve stem 螺栓阀杆

gas cylinder with threaded valve 带螺旋阀的氧气筒

Internal threaded block valve 内螺纹截止阀

Angle external threaded block valve 角形外螺纹截止阀

THREADED GATE VALVE 螺纹闸阀 ; 内螺纹闸阀

Straight external threaded block valve 直形外螺纹截止阀

Threaded Cap Type Plastic Valve 装配一个螺母式塑阀

THREADED CHECK VALVE 螺纹止回阀

THREADED STRAINER VALVE 螺纹过滤器