Balanced bellows seals may be required instead of conventional type due to process fluid considerations. Pilot operated valves are acceptable in place of bellows type for clean services.
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释义
出于对工艺介质的考虑,平衡波纹管密封可能要求替代常规类型。对于洁净用途,允许用辅助操作阀替代波纹管类型。
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