Breather Caps GN 774 (SFW.)

ELESA original design

code: SFW.

Type: A - Without dipstick

Standard sheet GN 774 Print this page Level markings / Special lengths GN 109 Function GN 774 Plastic Characteristics

Product description

Function and operational criteria of breather plugs GN 774 see function description.

Breather caps are fitted either with a threaded neck or with a bayonet connection and they can also be combined with a filler strainer GN 664 or GN 664.1.

The bayonet version is fitted with a chain to avoid losing it.

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

Specification

Plastic (Polyamide PA)

Temperature resistant up to 100 °C
Upper part (cap)
Orange, RAL 2004OR
Lower part (threaded part / bayonet)
Black, matte finish

Seal
Rubber NBR (Perbunan^®)

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 Thread Type A	Type B	Bayonet	Opening pressure in mbar		d₃	d₄	d₅	l₁	l₂	l₃	l₄	l₅	l₆

57	G 3/4	-	-	350	700*	35	16	56	13	6	48	-	-	-
70	G 3/4	G 3/4	-	350	700*	35	16	68	15	6	63	-	-	188
70	G 1 1/4	G 1 1/4	-	350	700*	-	25	68	17	-	59	-	-	195
70	G 2	-	-	350	700*	-	25	68	17	-	59	-	-	-
70	-	-	BA 39	350	700*	-	25	68	-	-	-	14	56	195

GN 774 Breather Caps Plastic, with Filter, with Double Valve

Product description

Specification

On request

Article options / Table

Type

Build & Price

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 774 with double valve are normally used if the oil container is under pressure and if outside air has to flow back in to compensate for the vacuum caused by falling oil level. This is achieved by combining two valves (non-return / bypass valve). The inlet valve opens at a vacuum of 30 mbar or greater. The second valves opens at an overpressure > 350 / 700 mbar. The air filter prevents the oil from being polluted from the outside (dust). The filter is made of PU foam with a filtration of 40 µm. The overpressure inside the container ensures that the air volume flowing in or escaping owing to fluctuations of the oil level is kept to a minimum. This reduces filter fouling and substantially increases the useful filter life, especially in a dusty environment. Also, a container under pressure has a positive effect on the function of the pump and prevents foaming. The valve seal ensures that no oil can spill to the outside, neither by excessive agitation in the tank nor during transport.

						Pressure curve Δp [mbar] in the container as factor of the air flow rate [l/min.] at a valve opening pressure of 350 or 700 mbar.



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.