External thread the needle valve, welded needle valve, needle valve block, internal thread the needle valve Needle valve with easy installation and removal, connections are tight, there is conducive to fire, explosion-proof and high voltage capability, good sealing performance advantages of the valve power plant, oil refinery, chemical plant and instrument measuring pipe connection of an advanced, three-valve, five-valve, thread the needle valve, external thread the needle valve, needle valve card sets, welded needle valve, J11W needle valves, J13W needle valves, J21W needle valves, J61W needle valve, J91W needle valves, J29W needle valves, J63Y needle valves, J19H needle valves, J24W needle valves, J18H needle valves, pressure Gauge valve, high-sealing sampling valve, pneumatic pipe closing valves, measuring line ball valve, globe valve measuring tube, small diameter valves, instrument manifolds, valve inside the wire, outside the wire check valve, two ball valves, check valves snap, one-piece inner teeth