| 摘要 |
<p>A gas supply device comprises a gas storage capsule sealed by a pierceable, malleable closure disc 4 that is crushed by a cap 10 housing a valve member 14 in an axial passage 12 and typically making a fixed and permanent engagement with the capsule 2. The valve member 14 is integral with or carries a forward disc-piercing needle 16 and is able to be urged by application of a disc-piercing force to pierce the disc to release gas from the capsule. The valve member 14 has a rearward end which is normally biased by a compression spring 24 into a valve-closing engagement with an inner surface of the cap 10. The valve therefore closes if the disc-piercing force is withdrawn.</p> |
