| 摘要 |
<p>A cold-gas machine includes first and second pistons for varying the volumes of a cold and a warm space; the first piston has a seal and a duct which communicates with a buffer space, the latter communicating via a duct with the warm space, debouching at a place situated between the axial boundaries of said seal. A non-return valve opens in the direction of the warm space is incorporated in this duct.</p> |
