CPC B64B 1/44 (2013.01) [B64B 1/40 (2013.01); B64B 1/64 (2013.01); B64D 1/12 (2013.01); B64D 11/00 (2013.01); B64D 17/18 (2013.01); B64D 2011/0061 (2013.01)] | 22 Claims |
1. A system comprising:
a balloon comprising a surface, the balloon defining: a balloon apex, a balloon interior within the surface, and a balloon exterior outside the surface;
a first valve arranged proximal to the balloon apex at the surface, the first valve operable to controllably fluidly couple the balloon interior to the balloon exterior;
a passive vent arranged at the surface of the balloon, the passive vent operable to passively transition from a first configuration to a second configuration, wherein:
in the first configuration, the balloon interior is fluidly coupled to the balloon exterior via the passive vent and the passive vent is configured to passively maintain a substantially zero-pressure condition within the balloon; and
in the second configuration, the passive vent is substantially sealed.
|