Although fulfilling the original design intent and functioning as intended, many “traditional” sealing systems found in the industrial applications waste considerable amounts of energy. The uncontrolled injection of seal flushing liquids – usually associated with Plan 32 piping described earlier in Part 2 – promotes such waste. In contrast, controlled injection uses a control valve; this partially alleviates waste and may save two-thirds of “uncontrolled” fluid flush flow previously used with plan 32.
Part 3 now explains the workings of fluid control valves as they reduce injection rates to one-third of “uncontrolled”. But first an overview of how mechanical seals function and why clean flush is always needed for long-term satisfactory seal performance.
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Modern Pumping Today