| 1. | It would get so hot that it would melt the check valve,
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| 2. | A check valve allows flow in only one direction and prevents back-flow.
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| 3. | Should the vehicle overturn, check valves automatically close to further prevent spillage.
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| 4. | The internal check valves may be flapper type or spring-loaded balls.
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| 5. | Mechanical check valves require too much pressure to function properly in this application.
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| 6. | The check valve in the Canadian currency area is capital and labor mobility.
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| 7. | There are various types of check valves used in a wide variety of applications.
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| 8. | The check valve has a flap which opens and closes as fuel is removed.
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| 9. | The problem was traced to a leak in the liquid oxygen preburner check valve.
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| 10. | Ball check valves are often very small, simple, and cheap.
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