J61 welded (with heat sink) needle valve has the advantages of easy installation and disassembly, connection and tightening, conducive to fire prevention, explosion-proof and high pressure resistance, good sealing performance, etc., and is an advanced connection method valve in power stations, oil refining, chemical equipment and instrument measurement pipelines. The needle globe valve has good sealing and long service life, even if the sealing surface is damaged, only the vulnerable parts need to be replaced, and it can continue to be used. The flow direction of the medium should be consistent with the direction of the arrow on the valve body during installation.