そして、two way valveが破損した最初の原因は、cooling water temperature at out let of the pumpが一定にならない為、two way valveが常に長時間on-offの状態にあった可能性が高いです。
Then the first cause of the damage to the two way valve was most likely that the cooling water temperature at the outlet of the pump was not constant, so the two way valve was always on and off for a long time.
