All engines have built-on non-return valves and flame arresters.

所有柴油机都安装有止回阀和防火焰装置。

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Working medium inlet and exhaust non-return valves balance hole for Stirling engine is introduced.

对热气机工质进排气单向阀平衡孔作了简介。

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In pipeline systems, non-return valves are important valves, of which swing non-return valves are most widely used.

在管道输送系统中，止回阀是重要的阀门之一，其中，旋启止回阀最为常用。

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New measures include flood-resistant doors, removable barriers for doors, and "air bricks" to allow ventilation and non-return valves on domestic and foul drains.

BBC: Berkshire woman gets help for home hit by floods 10 times

The Environment Agency will also be working on homes and businesses on Greta Side to fit properties with resistance measures such as waterproofing and non-return valves.

BBC: Keswick flood defence work to start