並前往https://books.google.com.tw/books?id=yvp8EAAAQBAJ&pg=PA135&lpg=PA135&dq=valve&source=bl&ots=uHPoiAhB0C&sig=ACfU3U2kTphLCZ61yl0QLTt8aJ4ZbcXHvQ&hl=zh-TW&sa=X&ved=2ahUKEwit4_yu9aH9AhVdg1YBHS95DFYQ6AF6BQjqAhAD