| 摘要 |
A fluid injection valve in which an orifice plate is produced by defining surfaces of walls forming an orifice on a plate-like basic material by pressing with a punch, forming a protective layer on a surface of the basic material, grinding a surface of the basic material to form an opening portion of the orifice at a predetermined opening value by measuring an amount of light passing through the orifice, and removing the protective layer in a tank filled with weak hydrochloric acid. It is possible to manufacture a fluid injection valve which has excellent fluid injection characteristics and injection quantity adjustment easily and with less expense.
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