並前往https://books.google.com.tw/books?id=BIvPDwAAQBAJ&pg=PA184&lpg=PA184&dq=valve&source=bl&ots=ZEFjM-Jo1k&sig=ACfU3U0T9wxcf9w9SU8oKuThbjevHpYhgw&hl=zh-TW&sa=X&ved=2ahUKEwit4_yu9aH9AhVdg1YBHS95DFYQ6AF6BQjrAhAD