| 摘要 |
A valve element, comprising a frame, at least one first inlet, at least one second inlet and at least one outlet. The valve element consists of a combination comprising at least one burst disk or equivalent, which, when unbroken, closes a passage from the second inlet at least to the outlet, and a piston element comprising a piercing element or the like for piercing the burst disk, said piston element being arranged to be movable between at least two positions when the burst disk has been pierced, in which first position the passage from the second inlet to the outlet is closed while in a second position the passage from the second inlet to the outlet is open, to which second position the piston element is moved after the pressure difference between the second inlet and the first inlet has reached a predetermined value.
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