MANUFACTURING METHOD OF FLUID CONTROL APPARATUS

To provide a manufacturing method of a fluid control apparatus which can prevent the occurrence of a stay of fluid without causing a valve body or a valve seat which is constituted by the fusion of a seating member and a main body member to possess a clearance between the seating member and the main body member.SOLUTION: In a manufacturing method of a chemical valve for controlling a fluid flow by the abutment or separation of a diaphragm valve body 122 on and from a valve seat, the diaphragm valve body 122 is a coupling body of a seating member 1222 abutting on the valve seat and a main body member 1221, the coupling body is formed by shaving a material coupling body which is obtained by fusing a seating member material being a material of the seating member 1222 and a main body member material being a material of the main body member 1221 to each other, and the fusion is performed in a range wider than a contact face between the seating member 1222 and the main body member 1221 of the coupling body in a contact face between the seating member material and the main body member material of the material coupling body.SELECTED DRAWING: Figure 2 【課題】着座部材と本体部材とが溶着されることで構成される弁体または弁座が、着座部材と本体部材との間に隙間を有することなく、流体の滞留の発生を防止することが可能な流体制御機器の製造方法を提供すること。【解決手段】ダイアフラム弁体１２２が弁座に当接または離間することで、流体の流れを制御する薬液弁の製造方法において、ダイアフラム弁体１２２が、弁座に当接する着座部材１２２２と、本体部材１２２１と、の結合体であること、結合体は、着座部材１２２２の材料である着座部材材料と、本体部材１２２１の材料である本体部材材料と、を溶着した材料結合体を、削り出すことで形成されること、溶着は、材料結合体の、着座部材材料と本体部材材料との接触面において、結合体の、着座部材１２２２と本体部材１２２１との接触面よりも広い範囲で行われるものであること、を特徴とする。【選択図】図２