▎ 摘　　要

NOVELTY - The valve (1) has a replacement type metal seal (30) that is inserted into an inlet port of a valve frame (10) that is located on a straight line with a stem (20). A metal seal connector (16) is screwed into the inlet. A sleeve fixture is inserted into a sleeve pipe portion, and a fixed pipe portion is in contact with an end of the metal seal. A connection screw portion is formed at a lower side of a passage hole. A sealing groove is formed in a sealing part. An auxiliary pipe is connected to a connecting screw portion. A surface of the stem is coated with graphene, titanium nitride and titanium carbonate. USE - High-pressure needle valve for controlling flow rate, flow rate and pressure of high-pressure fluid or gas. ADVANTAGE - The high-pressure needle valve comprises a valve body that is located on a straight line with a stem, and thus enables preventing the replacement type metal seal fixed by the metal seal connector coupled to the valve body from being concentric with the stem. The production cost and product cost is reduced. The competitiveness of the product is improved. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic cross-sectional view of the high-pressure needle valve. 1High pressure needle valve 10Valve frame 16Connector 20Stem 30Replacement type metal seal 40Sleeve fixture