Needle valve and method for manufacturing the same

Abstract

To provide a needle valve that reduces generation of particles, and a manufacturing method.SOLUTION: A needle valve 1 includes: a diaphragm 3 including a needle part 3a and a deformable membrane part 3b extending outwards therefrom; and a body 5 in which a valve chamber 6 is formed and which includes a cylindrical flow path part 5a that opens to the valve chamber. The opening area of the flow path part can be adjusted by a reciprocating movement of the needle part in the direction of a movement axis C. Each of the needle part and the flow path part is such that a tertiary carbon concentration M1 (mol%) at one end in each axial direction and a tertiary carbon concentration M2 (mol%) at the other end satisfy M1≥0.01, M2≥0.01, and 0.8≤M1 / M2≤1.2. A manufacturing method includes: a step of obtaining a cut piece of a cross-linked PFA film cross-linked such that a tertiary carbon concentration is greater than or equal to 0.01 mol%; a step of obtaining a re-molded object by re-molding the cut piece; and a step of obtaining a needle part and a flow path part from the re-molded object.SELECTED DRAWING: Figure 1

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