Pressurised breather caps

with double valve, technopolymer up to 100°C


Pressurised breather caps
Pressurised breather caps


Pressurised breather caps
Pressurised breather caps


Polyamide based (PA) technopolymer.

  • Cover: RAL 2004 orange, semi-matte finish, with graphic symbol "valve".
  • Threaded connector: black colour, semi-matte finish.

Packing ring

NBR synthetic rubber.

Overpressure valve

Technopolymer with NBR synthetic rubber O-ring and stainless steel spring.

Set at around 0.350 bar (on request 0.700 bar).

Suction valve

Technopolymer sealing disk with NBR synthetic rubber O-ring and stainless steel spring.

Set at around 0.030 bar.

Ring-shaped air filter

"Tech-foam" polyurethane foam mesh (polyester base), air filtration 40 µ.

Flat dipstick

Flat section phosphatised steel.

On request and for sufficient quantities dipstick can be supplied in different lengths and/or complete with MAX-MIN level lines.

Standard executions

  • SFW+F: without flat dipstick.
  • SFW-BA+F: with zinc-plated steel sheet bayonet, without flat dipstick. Chrome-plated steel safety chain.
  • SFW+F+a: with flat dipstick.
  • SFW-BA+F+a: with zinc-plated steel sheet bayonet and flat dipstick.

Maximum continuous working temperature



The use of SFW. pressurised breather caps which create a pressure plenum chamber right above the oil level within tested limit conditions, in order to avoid any reservoir deformation, offers the following advantages:

  • reduces reservoir air volume intake keeping clean oil and filter
  • improves suction pump action during working conditions reducing cavitation phenomenon
  • prevents fluid leakage when the system is part of a mobile unit
  • reduces foam in fluid.

Technical data

Air flow rate for each model can be determined from the graph calculating the difference between the pressure inside and outside the reservoir.



Special executions on request

  • Black cover.
  • Threaded connector also with NPT thread (National Taper pipe Thread - ANSI-ASME B1-20) for the codes marked with # in the table.


Feeling overwhelmed with what product to choose?

Don’t delay, give OIC a call and talk to us about your industrial application. Our aim is to help your business choose the right Elesa+Ganter element for the function you need. Whether you need to clamp, close, connect, control, level, manoeuvre, measure or set. OIC has an Elesa+Ganter machine element to fit your need.

We want to find out about your industrial application need and where we can help. Our contact details are below.