Abstract: A valve element (20), comprising a frame (21), at least one first inlet (26), at least one second inlet (27) and at least one outlet (28). The valve element consists of a combination comprising at least one burst disk (23) or equivalent, which, when unbroken, closes a passage from the second inlet (27) at least to the outlet (28), and a piston element (25) comprising a piercing element (24) 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 (27) to the outlet (28) is closed while in a second position the passage from the second inlet (27) to the outlet (28) 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.

Abstract: Valve element (3, 6, 10), comprising a frame, at least one inlet and at least one outlet, a passage connecting the inlet and outlet, at least one burst disk (13, 35, 63) or equivalent, which, when unbroken, closes the passage from inlet to outlet, and a piston element (15, 36, 65) provided with a piercing element or the like for piercing the burst disk. The piston element (15, 36, 65) is provided with a passage (17, 39, 67) for a pressure medium, said passage extending axially through the piston element from one first side to one second side, which passage leading through the piston forms a part of the passage of the pressure medium after the burst disk (13, 35, 63) has been pierced.

Abstract: The invention relates to a valve comprising a valve housing 1 with a duct 2 that can be optionally opened or closed, a valve body 4 and a valve spindle 3 that is displaceable in relation to the valve body 4 from a first position where the valve spindle 3 closes the duct 2, to a second position where the valve spindle 3 keeps the duct 2 open. The valve comprises a displaceable flange part 15 that surrounds the valve body 4, and which flange part 15 is arranged to support the valve body 4 by means of at least one displacement element 11, 12, 13. Flange part 15 is arranged to be displaced, in relation to the valve body 4, when force is applied to the flange part 15. To make the valve easy to operate, utilize very little force and have small dimensions, the valve spindle 3 is arranged to be displaced from the first position to the second position.