| 摘要 |
PURPOSE:To prevent an electric pump from heat destruction, by bringing the electric pump to suspend running through turning OFF of a safety pressure switch in case a pressure switch for automatic operation is brought in a trouble and the switch continues to keep ON-state. CONSTITUTION:If a pressure switch 6 for automatic operation should be out of order and be prevented from being brought in OFF-state although attaining the set OFF-pressure, and if an electric pump body 1 and the inside of a discharge pipe 4 are further increased in pressure, a safety pressure switch 7 is brought in OFF-state. Thus, the electric pump body is prevented from heat destruction due to operation under a high pressure condition of the electric pump body 1. Furthermore, since the OFF-pressure of the safety pressure switch 7 is lower than the shut-off head, the electric pump body 1 is also prevented from destruction due to a high pressure. |
