| 摘要 |
<p>A valve 40 comprises an inlet port 44, an outlet port 48, an exhaust port 60 and a diaphragm 50 disposed between the inlet 44 and exhaust 60 ports which is moveable, in response to air pressure within the valve 40, between a first position in which it seals the exhaust port 60 and a second position in which the exhaust port 60 is open, there being one or more projections 64 associated with the exhaust port 60 on which the diaphragm 50 is able to rest in its first position.</p> |
