| 摘要 |
A valve 101 for controlling the flow of a fluid comprises a valve body defining an inlet 116 and an outlet 117 and a passage 124 extending through the body defining a flow direction between the inlet and outlet. First and second valve members 125, 126 are disposed in series in the passage and have respective first and second valve seats135, 136. The first valve member 125 and first valve seat 135 is positioned upstream of the second valve member 126 and its second valve seat 136. Each valve member is movable between a closed position and an open position and each valve member is biased to the closed position. The first valve seat 135 is positioned upstream of the first valve member 125 and the second valve seat 136 is positioned downstream of the second valve member 126. |
