Abstract: Either the base part or the coupling part includes a first coupling member which is substantially circular in cross-section in a radial direction perpendicular to the central axis and has a diameter of a first length, while the other of the base part and the coupling part includes a first holding member which, with its inner circumferential surface having a substantially circular shape in cross-section in the radial direction, holds the first coupling member so as to surround its outer circumferential surface. The inner circumferential surface of the first holding member is partially opened in the radial direction, and an opening width of an opening part of the first holding member, which is elastically deformable, is narrower than the first length.

Abstract: Provided is a flow regulating apparatus 100 including a flow regulating mechanism including: a flow regulation knob 3; a screw rod 10 that adjusts an insertion amount of a diaphragm needle 5 into a valve hole 32; and a spring roll pin 13 that is fixed to the flow regulation knob 3, wherein the screw rod 10 includes a first male threaded portion that is fastened to a female threaded portion 9a formed on an inner circumferential surface of a cover section 9, and a through hole 10d penetrating in the direction substantially perpendicular to the center axis C and having a predetermined width in the direction of the center axis C, and the spring roll pin 13 is inserted into the through hole 10d.

Abstract: Provided is a flow regulating apparatus 100 including a flow regulating mechanism including: a flow regulation knob 3; a screw red 10 that adjusts an insertion amount of a diaphragm needle 5 into a valve hale 32; and a spring roll pin 13 that is fixed to the flow regulation knob 3, wherein the screw rod 10 includes a first male threaded portion that is fastened to a female threaded portion 9a formed on an inner circumferential surface of a cover section 5, and a through hole 10d penetrating in the direction substantially perpendicular to the center axis C and having a predetermined width in the direction of the center axis C, and the spring roll pin 13 is inserted into the through hole 10d.

Abstract: Either the base part 4 or the coupling part 3 includes a first coupling member 3a which is substantially circular in cross-section in a radial direction perpendicular to the central axis and has a diameter of a first length D1, while the other of the base part 4 and the coupling part 3 includes a first holding member 4c which, with its inner circumferential surface having a substantially circular shape in cross-section in the radial direction, holds the first coupling member 3a so as to surround its outer circumferential surface. The inner circumferential surface of the first holding member 4c is partially opened in the radial direction, and an opening width of an opening part 4g of the first holding member 4c, which is elastically deformable, is narrower than the first length D1.