For control valves, leakage from valve packing shall be minimised by the use of special packing materials and/or bellows seals designed to meet the SECCO fugitive emissions targets.

• 对于调节阀，来自填料的泄漏应通过使用特殊的填充材质和/或波纹管式密封设计减小到最小，来达到赛科挥发性散射要求。