| 摘要 |
<p>A fluid flow control device comprises a housing 2 with an inlet 5 and outlet 9 and a passage extending therebetween. The passage has a tapered portion 6 which narrows in the direction towards the inlet 5. A fluid flow control member 3 is located in the passage and has a tapered end corresponding to the tapered portion 6 of the passage. The member 3 is moveable longitudinally within the passage between a first position in which the tapered end engages the tapered portion 6 of the passage and fluid flow along the passage towards the inlet 5 is blocked, and a second position in which fluid flow along the passage is allowed. The member 3 includes a laterally extending surface located within the tapered end portion 6 which faces towards the outlet 9 so that if fluid flows towards the inlet 5, the fluid will impinge on the surface and cause the member 3 to pushed to be the blocking position.</p> |
