Abstract: Plastic fuel tank having a lower wall, an upper wall and at least one reinforcing element connecting these two walls, this reinforcing element comprising a hollow plastic pillar having an opening in its lower part and an opening in its upper part, these openings being situated at locations such that they allow, respectively, the filling of the pillar and the degassing thereof, at least one part of the hollow pillar being a constitutive element of an accessory that has an active role in the tank.

Abstract: Ventilation valve for a liquid tank comprising: an housing comprising a side wall provided with ventilation openings, a cover provided with a ventilation aperture which may be connected to a venting circuit of the tank, and a base pierced with at least one drainage aperture; and a float capable of closing off the ventilation aperture, such float being able to slide vertically inside the housing depending on the level of liquid therein, the valve also comprising a drainage chamber located underneath the housing in which the valve slides, the chamber also comprising at least one drainage aperture that is not aligned with the drainage aperture of the base of the housing.

Abstract: A device for a venting circuit of a liquid tank provided with a canister and a filling tube including a filling head, this device comprising: a) a control chamber that communicates with: the canister via a main orifice and a smaller-flow-area secondary orifice, both terminating in a ventilation line leading to the canister; the interior of the tank via the venting circuit; and the filling head via a pressure-equalizing line; b) a closure member that is: provided with an opening therethrough which brings the venting circuit into communication with the pressure-equalizing line; able to move in the control chamber between an operating position with the main orifice closed off by gravity and the secondary orifice left open, and a filling position with both orifices left open; and shaped to sealingly conform to at least a control chamber part that includes the main orifice.

Abstract: A valve for the venting circuit of a liquid tank including a main chamber which opens into the tank and is connected via an aperture to the venting circuit, a float comprising a body, and a head capable of closing off the orifice. The float being able to slide vertically inside the main chamber. The valve further including a baffle surrounding the aperture and defining a secondary chamber via the bottom inside the main chamber. The dimensions and the shape of the secondary chamber, of the body of the float, and of the head of the float are designed so that the head can slide at least partly inside the secondary chamber, while the body of the float cannot do so.

Abstract: Valve for the ventilation circuit of a liquid tank, comprising: a) a chamber comprising a base, a side wall and a cover; b) at least two independent ventilation orifices in the chamber cover connecting the chamber to the venting circuit; c) at least one orifice in the chamber side wall connecting the chamber to the inside of the tank; d) at least two independent concentric floats, each comprising an apex capable of sealing one of the ventilation orifices, each being able to slide vertically inside the chamber depending on the liquid level in the chamber and to rest on the chamber base when the chamber is empty; one of the floats being calibrated so as to seal one of the ventilation orifices at one liquid level L1 in the tank and the other float being calibrated so as to seal the other ventilation orifice at a level L2 above L1.

Abstract: A device for a venting circuit of a liquid tank provided with a canister and a filling tube including a filling head, this device comprising: a) a control chamber that communicates with: the canister via a main orifice and a smaller-flow-area secondary orifice, both terminating in a ventilation line leading to the canister; the interior of the tank via the venting circuit; and the filling head via a pressure-equalizing line; b) a closure member that is: provided with an opening therethrough which brings the venting circuit into communication with the pressure-equalizing line; able to move in the control chamber between an operating position with the main orifice closed off by gravity and the secondary orifice left open, and a filling position with both orifices left open; and shaped to sealingly conform to at least a control chamber part that includes the main orifice.

Abstract: Liquid tank venting system comprising a chamber that is inside the tank and that is equipped with a drainage device that comprises at least one opening made in the chamber and an elastomer-based non-return valve capable of sealing/freeing this opening, according to which this non-return valve is forced into a position for leaktight closure of the opening via a specific device starting from a certain liquid level in the tank.

Abstract: Valve for the venting circuit of a liquid tank said valve comprising: a) a chamber which comprises openings that allow liquid to penetrate into the chamber above a certain level in the tank and/or in the event of waves in the tank or the tank being turned upside down; b) a cover for the chamber comprising an aperture that is susceptible to open into the venting circuit of the tank; and c) a float comprising a body and a needle capable of closing off the aperture, said float being able to slide vertically inside the chamber depending on the level of liquid therein, the needle of the float being frustoconical-shaped and based on an elastomeric material.

Abstract: Valve for the venting circuit of a liquid tank, said valve comprising: a) a main chamber (3) which opens into the tank and is connected via an aperture (14) to the venting circuit (2); b) a float comprising a body (4) and a head (5) capable of closing off the orifice (14), said float being able to slide vertically inside the main chamber (3); and c) a baffle (12) surrounding the aperture (14) and defining a secondary chamber (3?) via the bottom inside the main chamber (3), the dimensions and the shape of the secondary chamber (3?), of the body (4) and of the head (5) of the float being designed so that said head (5) can slide at least partly inside the secondary chamber (3?), while the body (4) of the float cannot do so.

Abstract: Valve for the venting circuit of a liquid tank, said valve containing: a) a chamber (3) which opens into the tank and is connected via an aperture to the venting circuit; b) a float containing a head provided with a needle and able to slide vertically inside the chamber; and c) a closure member for closing off the venting aperture and itself having an aperture that can be closed off by the needle of the float, the closure member having a flexible seal which is capable of moving substantially vertically relative to the head of the float, said head being provided with a device for limiting the movement of the seal