Breather check valve caps EN 774.1 prevent the build up of underpressure in fluid containers.
They are used when a container is to be emptied quickly. The elastic membrane ensures a sufficient air supply.
Besides that, the contact pressure of the membrane prevents the escape of fluid, e.g. during transport. If the container is turned upside down, the additional contact pressure from the fluid will be sufficient to keep the outlet firmly shut.
Specification
Upper part (cap)
Plastic
Technopolymer (Polypropylene PP)
Temperature resistant up to 122 °F (50 °C)
Red, RAL 3000RT
Membrane and flat seal
EPDM (Ethylene propylene diene rubber)
Green, RAL 6001GN
Membrane and flat seal
FKM (Fluor rubber, Viton®)
Black printed symbol
Lower part (screw-in thread)
Plastic
Technopolymer (Polypropylene PP)