| 摘要 |
A gas spring (10) for a sliding refractory gate valve, comprising a container (12), a ram (28) which is extendable relative to the container, a bellows (30) connected at one end to the ram and at the other end to a part of the container, a gas (33) within the container outside the bellows and acting to compress the bellows and extend the ram, wherein the ram has a blind internal bore (49) and a mechanical compression spring (46) is at least partially disposed in the bore so as to be interposed between the ram and the container and also acting to extend the ram.
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