OBTURATEUR DE TUBE, NOTAMMENT SOUPAPE ENTIEREMENT METALLIQUE POUR DES INSTALLATIONS A VIDE POUSSE

A.OBTURATEUR DE TUBE, NOTAMMENT SOUPAPE ENTIEREMENT METALLIQUE POUR DES INSTALLATIONS A VIDE POUSSE.B.OBTURATEUR DE TUBE CARACTERISE EN CE QUE LE BORD EXTERNE DU SIEGE ANNULAIRE DE SOUPAPE 13 EST RELIE A DEUX RESSORTS BELLEVILLE 15, 16 DISPOSES EN SENS CONTRAIRE L'UN DE L'AUTRE ET DE DIAMETRES DIFFERENTS, LE CORPS ANNULAIRE DE SECTION TRANSVERSALE EN FORME DE V CONSTITUE PAR CES DEUX RESSORTS BELLEVILLE 15, 16 PRENANT APPUI PAR SES BORDS 19, 20 SUR LE BOITIER DE SOUPAPE 1, 2 ET DELIMITANT AVEC CE BOITIER UNE CHAMBRE 17.C.L'INVENTION S'APPLIQUE NOTAMMENT A L'OBTURATION DE CANALISATION OU REGNE UN VIDE POUSSE. A pipe valve assembly including a housing defining a flow aperture, a valve member for opening and closing the flow aperture, a spring biased valve seat ring for pressing the valve member to seal the aperture, a spring assembly urging the valve seat ring away from its sealing position and a fluid pressure chamber on one side of the spring assembly for receiving fluid pressure to actuate the valve seat ring into its sealing position. The spring assembly in formed with a smaller diameter annular spring member and a larger diameter annular spring member arranged coaxially relative to each other and relative to the valve seat ring with the valve seat ring being attached with an outer edge of the smaller diameter spring member and the inner edge of the larger diameter spring member. The spring assembly is supported in the housing at an inner edge of the smaller diameter spring member and at an outer edge of the larger diameter spring member.