| 摘要 |
A liquid tension-sensitive gas valve for use in an environment containing liquid includes an inlet connectable to a source of gas and an outlet connectable to a receiver of gas. An internal porous member disposed between the inlet and the outlet has a plurality of pores having pore openings which are closed when filled with liquid and which are open when the tension (negative hydrostatic pressure) of the liquid therein has increased past a predetermined level. The internal member prevents movement of gas between the inlet and the outlet when the moisture content of the internal porous member has increased to cause the liquid tension to decrease below the predetermined level, wherein moisture has closed the pores. Conversely, the internal porous member permits the movement of gas between the inlet and the outlet when the moisture content therein has decreased to cause the liquid tension to exceed the predetermined level, wherein the pores are open. An external porous member having a plurality of pores and disposed between the internal porous member and the environment restrictably passes liquid between the environment and the internal porous member, thereby allowing moisture content of the environment to control the movement of gas through the valve through the internal porous member.
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