| 摘要 |
A throttle valve for use in a closed fluid cycle engine where the fluid is passed through the valve at high temperature and pressure and where the engine includes portions of the fluid cycle having the fluid at low pressure. The valve stem is hermetically sealed to the housing by means of a bellows seal enclosed in a chamber which is vented to the low pressure portion of the engine. A seal such as a laminar seal or a labyrinth seal encloses the valve stem between the high pressure gas inlet and outlet and the bellows chamber. This stem seal produces a pressure drop protecting the bellows from the effects of high pressure and limits the fluid flow from the valve inlet and outlet to the bellows chamber to less than 5 percent of the total fluid flow through the valve.
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