Seal Details
Type: 1678
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Stepped shaft, balanced sinusoidal wave-spring, ‘O’-Ring mounted seal, similar to Type 1677, most commonly utilised in higher-pressure pump applications.
Vulcan Types 1677, 1677M and 1678 all have sinusoidal continuous wave-springs without joints or weld-spots, for maximum spring reliability.
Stocked as a standard assembly with “stepped-size down” Type 8 DIN LONG ‘O’-Ring seat with anti-rotation provision.
Metric Dimensions
| D0 | Size Code | D1 | D3 | L1 | L2 | Slot Width | Slot Depth | Seat Size |
| 18 | 0180 | 25 | 32 | 32.5 | 10 | 4 | 5 | 14 |
| 20 | 0200 | 27 | 34 | 32.5 | 10 | 4 | 5 | 16 |
| 22 | 0220 | 33 | 36 | 33.5 | 11.5 | 4 | 5.5 | 18 |
| 24 | 0240 | 35 | 38 | 33.5 | 11.5 | 4 | 5.5 | 20 |
| 28 | 0280 | 39 | 42 | 36 | 11.5 | 4 | 5.5 | 24 |
| 30 | 0300 | 40 | 44 | 36 | 11.5 | 4 | 5.5 | 25 |
| 33 | 0330 | 43 | 47 | 38.5 | 11.5 | 4 | 5.5 | 28 |
| 35 | 0350 | 45 | 49 | 38.5 | 11.5 | 4 | 5.5 | 30 |
| 38 | 0380 | 48 | 54 | 38.5 | 11.5 | 4 | 5.5 | 33 |
| 40 | 0400 | 50 | 56 | 38.5 | 11.5 | 4 | 5.5 | 35 |
| 43 | 0430 | 56 | 59 | 38.5 | 14 | 5 | 5.5 | 38 |
| 45 | 0450 | 58 | 61 | 38.5 | 14 | 5 | 5.5 | 40 |
| 50 | 0500 | 63 | 66 | 38.5 | 14 | 5 | 5.5 | 45 |
| 53 | 0530 | 66 | 69 | 38.5 | 14 | 5 | 5.5 | 48 |
| 55 | 0550 | 70 | 71 | 42.5 | 15 | 5 | 5.5 | 50 |
| 60 | 0600 | 75 | 80 | 42.5 | 15 | 5 | 5.5 | 55 |
| 65 | 0650 | 80 | 85 | 47.5 | 15 | 5 | 5.5 | 60 |