| 摘要 |
<p>The invention relates to a valve particularly for use in offshore applications. The valve comprises a house with an inlet side (I) and an outlet side (O), a seat (4) and a sealing element (5) displaceable with respect to each other to provide a substantially closed position and at least one open position. The outlet side (O) is provided by an exit passage (11) in the house, wherein the exit passage (11 ) has an exit length (L) measured as the shortest length a fluid must pass from the seat element (4) or the sea-ling element (5) to the exit of the valve. The exit passage (11 ) has a narrow length section (12), in each cross sectional cut perpendicular to the exit length (L) and along the narrow length section (12). The narrow length section (12) has a periphery (P) and a maximum gap (M) determined as the longest of shortest periphery-to-periphery straight lines through each point within the periphery (P), and an ave-rage maximum gap (M) along the narrow length section (12). The narrow length section (12) is about 2 times as long as the average maximum gap (M) or longer. The relatively small average maximum gap (M) of the narrow length section (12) prevents electrical current to reach into the part of the passage (11) closest to the seat/sealing (4, 5) and/or closer to the seat/sealing (4, 5) than the narrow length section (12) and thereby formation and precipitation of che-mical components is reduced resulting in a reduced risk of leakage.</p> |
