A | Without dipstick |
B* | With dipstick |
0 | With splash guards, with wire mesh filter |
1 | With splash guards, without filter |
2 | With splash guards, with PU filter |
3 | Without splash guards, without filter |
4 | Without splash guards, with PU filter |
d1 | d2 | d3 | d4 | l1 | l2 ≈ | l3 | ||
---|---|---|---|---|---|---|---|---|
31 | G 1/4 | - | - | 8 | 30 | 9,5 | 29,5 | 188 |
31 | G 3/8 | M 16 x 1,5 | M 18 x 1,5 | 10 | 30 | 9,5 | 29,5 | 188 |
31 | G 1/2 | M 20 x 1,5 | M 22 x 1,5 | 12 | 30 | 9,5 | 29,5 | 188 |
42 | G 3/8 | - | - | 10 | 41 | 11,5 | 36,5 | - |
42 | G 1/2 | - | - | 12 | 41 | 11,5 | 36,5 | - |
42 | G 3/4 | - | - | 18 | 41 | 11,5 | 36,5 | 184 |
42 | G 1 | - | - | 18 | 41 | 11,5 | 36,5 | 184 |
57 | G 3/4 | - | - | 18 | 56 | 14 | 42 | - |
57 | G 1 | - | - | 23 | 56 | 14 | 42 | - |
57 | G 1 1/4 | - | - | 28 | 56 | 16 | 42 | 184 |
57 | G 1 1/2 | - | - | 28 | 56 | 16 | 42 | 184 |
Breather caps GN 552 are used in oil reservoirs which must be ventilated. If the oil is agitated, e.g. by a gear running in an oil bath or sump, there is the risk that the oil will leak. With properly aligned and shaped splash guards (see schematic drawing), these breather caps prevent the oil from leaking without substantially disrupting the ventilation / breathing process (pressure compensation). The splash guards can be left out if their function is no longer needed or if a higher air flow rate is desired (coding 3 and 4). A filter is used to protect the oil from outside pollution (dust). The filter is mounted behind the splash guards to ensure it makes no contact with the oil and becomes saturated by capillary effect. For a very high air flow rate (the level of the oil reservoir changing quickly), Breather Caps GN 663 should be used. |
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Air flow rate [l/min] in reliance on the pressure |
Air flow rate [l/min] in reliance on the pressure |
Level markings and special lengths GN 109 for oil dipsticks are available for the standards shown above. The dipstick is shortened to the length l1 and the marking notches are milled in at l2 or l3 with the effect that they are easily visible. The maximum length l1 is given in the appropriate standard. The length specifications l1 to l3 refer to the contact surface without seal, with a tolerance of ±1 mm to be taken into account. For critical applications and depending on standard, the seal must be taken into consideration with a thickness of as much as 2 mm. The level markings / special lengths GN 109 are to be ordered as a separate item in shopping cart step 1 under note. |
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