Main specifications
Cover
Polyamide-based (PA) technopolymer, black colour RAL 9005, matte finish, laser engraved graphic symbols.
Threaded fitting
Polyamide-based (PA) technopolymer, with splash guard and hexagon nut, black colour, semi-matte finish.
Packing ring
NBR synthetic rubber flat washer.
Overpressure valve
Technopolymer with NBR synthetic rubber O-ring.
Stainless steel spring, set at around 0.350 bar.
Suction valve
NBR synthetic rubber and stainless steel spring.
Set at around 0.030 bar.
Air filter
Polyester with a filtration rate of 3µm (efficiency > 98%).
Flat dipstick
Flat section phosphated steel (maximum visibility of the fluid level).
On request and for sufficient quantities dipstick can be supplied in different lengths and/or complete with MAX-MIN level lines.
Maximum continuous working temperature
100°C.
General information
Features
The SFW-AF (registered design) breather cap maintains a reservoir of air under pressure above the oil level within the limits established in the design stage to avoid deformation of the tank walls. Benefits:
- it reduces reservoir air volume intake keeping clean oil and filter;
- it improves suction pump action under working conditions reducing cavitation phenomenon;
- it prevents fluid leakage when the system is part of a mobile unit;
- it reduces foam in fluid.
SFW-AF caps are made with a special internal geometry which stops the leakage of the fluid to the outside.
The hexagon on the threaded fitting makes it possible to apply, using a wrench, a greater tightening torque on the cap, ensuring better compression of the gasket.
Technical data
Air flow rate for the different executions of breather caps can be obtained from the diagram on the basis of the difference of air pressure inside and outside the reservoir.
