| 摘要 |
<p>A self-opening and self-closing valve assembly (12), which comprises a pressure-deformable resilient wall member (16) having an outlet port (22); which also comprises obstructing means (14) normally engaged in a fluid-tight relationship with the member (16) or the outlet port (22); and which is adapted such that pressure impinging on the wall member (16) can cause deformation thereof, thereby breaking the fluid-tight relationship. The novel valve assembly may be used together with a source of microwave energy, for the purpose of reacting a sample with a digesting agent in a closed vessel, producing a canned food, sterilising an object within a sealed container, or dispensing a fluid at a predetermined temperature (if the wall member is thermoplastic and thus temperature-sensitive).</p> |
