| 1. | The lower tanks are connected to these ballast tanks by non-return valves.
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| 2. | Between the pump and Petworth, there were a number of non-return valves.
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| 3. | In naturally-aspirated petrol engines, the manifold vacuum is used, whereas in non-return valve.
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| 4. | Pneumatic non-return valves have a longer service life when compared to pneumatic bladder systems.
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| 5. | Following the accident, the non-return valve was re-designed so it could not be installed incorrectly.
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| 6. | A non-return valve is usually fitted to the breathing hoses where they connect to the mouthpiece.
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| 7. | In its simplest form, the engine contains a working gas, a liquid and two non-return valves.
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| 8. | A non-return valve in the auxiliary power unit ( APU ) had suffered a complete failure.
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| 9. | The cause was a non-return valve failure in the APU unit, resulting in hydraulic fluid igniting.
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| 10. | The bailout block has a connection for the main gas supply from the umbilical through a non-return valve.
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