Patent ID: 8684330

Claim:
A blocking device for selectively blocking a fluid passage for a filling intake, comprising: a) a structure ( 1 ) defining a channel ( 9 ) for the passage of fluid extending between an inlet ( 10 ) located at an upstream extremity and an outlet ( 11 ) located at a downstream extremity, b) a valve seat ( 12 ), c) a moveable valve ( 3 , 4 ) that is selectively moveable in the channel ( 9 ) between i) a first position configured to block the passage by contacting the seat ( 12 ) to form a seal and ii) a second position configured to open the passage wherein the valve is not in contact with the seat ( 12 ), d) a return member ( 5 ) adapted to force the moveable valve ( 3 , 4 ) towards the first position, e) a deformable sealing joint ( 7 ) supported by the moveable valve ( 3 , 4 ) and/or by the seat ( 12 ) configured to press against the seat ( 12 ) and to form the seal when the valve ( 3 , 4 ) is in the first position, wherein the moveable valve ( 3 , 4 ) comprises a) an upstream extremity ( 14 ) adapted to move the moveable valve ( 3 , 4 ) towards the second position when the upstream extremity ( 14 ) is subjected to an opening pressure, b) a main body ( 3 ) and a stop ( 4 ) that is moveable relative to the main body ( 3 ), c) the main body ( 3 ) and the moveable stop ( 4 ) configured to form a mechanism for selectively pressurizing the joint ( 7 ) that is adapted to switch between i) a working position adapted to pressurize the joint ( 7 ) to increase a force that joint ( 7 ) exerts on the seat ( 12 ), and ii) a resting position adapted to release the pressure on the joint ( 7 ) to thereby reduce the force joint ( 7 ) exerts on the seat ( 12 ), and wherein the valve is configured so that when the valve ( 3 , 4 ) moves from the second position ( 16 ) to the first position, the stop ( 4 ) stops first against a fixed portion of the structure ( 1 ) while the main body ( 3 ) effects an additional movement causing a relative movement between the main body ( 3 ) and the stop ( 4 ) that moves the mechanism for selectively pressurizing the joint ( 7 ) into its working position.