| 摘要 |
<p>A vacuum controlled three way butterfly valve for regulating the flow of fluids, as in internal combustion engine cooling systems and automotive heater systems, wherein a valve body includes a bypass port located in spaced relationship to the valve plate. In one position, the valve plate stops the flow of fluid through the valve body and permits the flow of fluid to return to the engine water pump. In the other position, the valve plate blocks off the bypass port, permits the flow of fluid through the valve body then restricts the throughput of fluid by means of a resilient orifice to protect the heater downstream of the valve core from excessive fluid pressure developed by the engine water pump and then to return the flow of fluid to the engine water pump.</p> |
