Breather Caps GN 552 (SFN. / SFP. / SFP+a)

GN 552 Breather Caps, Plastic Type: A - Without dipstick

ELESA original design
code: SFN. / SFP. / SFP+a

Type: A - Without dipstick

Standard sheet GN 552 Print this page Description of function Level markings / Special lengths GN 109 Plastic Characteristics

Product description

Function and operational criteria of breather caps GN 552 see description of function.

MAX-MIN markings can easily be added to the flats of a dipstick (see GN 109).

Type with dipstick (Type B) is only available for marks 0, 1 and 2 as follows:
Size 31 - all threads
Size 42 - G 3/4 and 1 only
Size 57 - G 1 1/4 and G 1 1/2 only

Specification

Plastic

Temperature resistant up to 100 °C
Upper part (cap)
Orange, RAL 2004
Lower part (threaded part)
Black

Seal
Rubber NBR (Perbunan^®)

Air filter wire mesh

Zinc plated
Filtration 50 to 60 µm

Air filter PU-foam (Polyurethane)

Filtration 40 µm
Temperature resistant up to 100 °C

Dipstick
Steel, phosphated

RoHS

On request

Fluid level markings / special lengths
see GN 109

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

d₁

d₂

d₃

d₄

l₁

l₂ ≈

l₃

G 1/4

9,5

29,5

188

G 3/8

M 16 x 1,5

M 18 x 1,5

9,5

29,5

188

G 1/2

M 20 x 1,5

M 22 x 1,5

9,5

29,5

188

G 3/8

11,5

36,5

G 1/2

11,5

36,5

G 3/4

11,5

36,5

184

G 1

11,5

36,5

184

G 3/4

G 1

G 1 1/4

184

G 1 1/2

184

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

GN 552 Breather Caps Plastic

Product description

Specification

On request

Article options / Table

Type

Identification No.

Build & Price

Description of function

GN 109 Level markings / Special lengths (special order)

Selected Part (How to order)

CAD data

CAD data

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	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.

Air flow rate [l/min] in reliance on the pressure difference Δp [mbar] container / outside space with filter (40 µm): Dash-dotted characteristic without filter: Normal characteristic Type without splash guards (Coding 3 and 4)		Air flow rate [l/min] in reliance on the pressure difference Δp [mbar] container / outside space with filter (40 µm): Dash-dotted characteristic without filter: Normal characteristic Type with splash guards (Coding 0, 1 and 2)



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. If required, more than 2 notches may be cut which are then specified by the appropriate details on the position (l₄ ... l_x). Also, texts such as MAX / MIN may be laser-engraved in addition to or instead of the notches by submitting the appropriate template. The level markings / special lengths GN 109 are to be ordered as a separate item in shopping cart step 1 under note.