J.W. Winco

Our customers in the USA are managed by J.W. Winco. Please, use the website of J.W. Winco: jwwinco.com

GN 764 Breather caps Steel sheet, with filter, with double valve


ELESA original design
code: SMN./SMW.

Product description


Function and operational criteria of breather caps GN 764 with double valve (Type FD) see description of function.

For the version with bayonet and filler strainer 6 slot head screws M5 x 10 are part of the order.


Steel (sheet metal)
  • Cap chrome plated
  • other parts Steel zinc plated

Sealing ring rubber (Perbunan)

Air filter PU-foam
  • Filtration 40 µm
  • temperature resistant up to 115 °C

Thrust spring Stainless Steel


On request

Type FD with other opening pressure
Threaded version with dipstick

Technical drawing

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GN 764 Breather caps with filter and double valve sketch

Article options / Table


Fwith filter
FDwith filter and double valve (only for d1=81)
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d3d4d5d6l1l2l3l4l5l6A/FOpening pressure
in mbar
Type FD
47G 1/41/4 NPTBA75240271055135136617-
81G 3/43/4 NPTBA1783724916127042178030350

Build & Price

Open 3D configurator
Outside diameter d1
Thread d2
Thread d2
Bayonet d2

Description of function


Breather caps GN 764 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 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 will leak even if the oil is heavily agitated or during transport.

Sketch GN 764 air flow rate

Air flow rate [l/min] in reliance on the pressure
difference Δp [mbar] container / outside spacce (Type with filter).

Sketch GN 764 pressure curve

Pressure curve Δp [mbar] in the container as factor of the air flow rate [l/min.] at a valve opening pressure of 350 mbar (Type with filter and double valve).

Selected Part (How to order)

Total (net)
plus VAT 1,59 €
gross 9,98 €
In stock
Weight: 0,057 kg
If this article is new in our product range, it may happen that details concerning weight are as yet not listed.
If you do need weight details, please contact our Sales Department!
Phone+49 7723 6507 - 0
RoHS: Yes
This article is RoHS-compliant in application of Annex III., which means it complies with EU Directive 2011/65/EU, including extension (2015/863/EU), for restricting the use of certain hazardous substances in electrical and electronic devices. The Directive regulates the use of hazardous substances in devices and components. The implementation in national law is summarily described with RoHS(Restriction of (the use of certain) hazardous substances)).
Please note our quantity discounts.
With a total value (net) per order:
from 175,00 Euro -> 10 % discount
from 275,00 Euro -> 20 % discount
from 375,00 Euro -> 30 % discount
With a total value (net) per order:
All prices in accordance with our price list No. 52, valid from 1 May 2019, plus VAT only valid for Germany.

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Our customers in USA are served by J. W. Winco. Please use the website of J. W. Winco.
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