| 摘要 |
<p>A failure protection apparatus including an air source providing air having an air pressure, a first valve in fluid communication with the air source permitting a control fluid to flow to a pressure control assembly when the air pressure is at least a minimum pressure and preventing flow of the control fluid to the assembly when the air pressure is below a minimum pressure, the assembly containing control fluid at a predetermined pressure that is maintained when the air pressure is below the minimum pressure, a second valve in communication with the air source permitting communication of air between an inlet and an outlet when the air pressure is below the minimum pressure, a third valve in communication with the air source, a pressure container in communication with the third valve outlet and having an outlet that feeds air to the second valve to actuate a warning device attached thereto.</p> |
