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