Abstract: A device for temporarily coupling together and subsequently separating a first member and a second member, comprises:a male member joined to the first member;a female member joined to the second member and comprising an axially elongate hollow body in which are disposed a retaining sleeve adapted to retract radially onto the male member or to expand, a piston sliding axially to retract/expand the retaining sleeve and, in the piston, disposed along the axis, an ejector finger joined to the piston by a readily broken member, andselective control means for the piston adapted to command movement of the piston and optionally simultaneous breaking of the readily broken member and to cause the ejector finger to slide axially, the finger projecting axially relative to the piston.

Abstract: A system for crystallogenesis by diffusion, intended in particular for use on board a space ship, and in which a substance to be crystallized contained in a crucible (18) is brought into contact with a precipitating agent.

Abstract: The pyrotechnic valve according to the invention comprises one or more pyrotechnic devices able to produce gases under a high pressure, which has the effect of suddenly deforming a membrane equipped with a rigid weight. The latter projects a punch, which shears a tight end fitting, thus freeing the fluid passage. The membrane ensures a perfect seal between the fluid circulation zone and the zone containing the gases produced by the pyrotechnic devices.