| 摘要 |
A passive leak detection device may include a pressure switch, a check valve and a balance valve. The pressure switch may include an electric input lead, an electric output lead, a balance chamber and an inlet chamber. A pressure differential between the balance chamber and the inlet chamber may be operable to couple the electric input lead to the electric output lead. The inlet chamber may be fluidly coupled to a fluid port. The balance chamber may be fluidly coupled to the fluid port with a check valve disposed there between. The balance chamber may be fluidly coupled to a balance valve. When the balance valve is closed and fluid is flowing out of the fluid port, the pressure differential from the inlet chamber to the balance chamber is operable to couple the electric output lead to the electric input lead thereby indicating of a leak.
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