Patent ID: 8434506
Filing Date: 2013-05-07
Classification: F02D,F02M,F16K,Y10T

Abstract:
1. A method for manufacturing a flow control valve, comprising: a gas passage forming step of forming in a housing formed of cast iron a gas passage through which gas that generates a corrosive substance passes, the gas passage including a first cylinder member accommodating portion, a second cylinder member accommodating portion arranged adjacent to the first cylinder member accommodating portion in an axial direction, and a radial step portion located between the first cylinder member accommodating portion and the second cylinder member accommodating portion; a first cutting step of cutting at least the first cylinder member accommodating portion; a first cylinder member press-fitting step of press-fitting in the axial direction a first cylinder member, which includes a first axial end surface and a surface formed of a highly corrosion resistant material having higher corrosion resistance against the corrosive substance than corrosion resistance of cast iron, into the cut first cylinder member accommodating portion; a second cutting step of cutting the first axial end surface and the radial step portion so as to be approximately flush with each other by simultaneously cutting at least the first axial end surface and the radial step portion among the first axial end surface, the radial step portion, and the second cylinder member accommodating portion; and a second cylinder member press-fitting step of press-fitting in the axial direction a second cylinder member, which includes a surface formed of the highly corrosion resistant material and a second axial end surface, into the cut second cylinder member accommodating portion such that the second axial end surface comes into contact with the first axial end surface and the radial step portion.