E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 33/06 (2006.01)
Patent
CA 2565439
A ram actuator for a blowout preventer, the ram actuator comprising a primary piston (30, 70) and a secondary piston (20, 22), the primary piston (30, 70) comprising a primary shaft (70) and a primary piston head (30) slidably arranged in a primary cylinder (15) having an primary cylinder head (13) and provided with a hydraulic fluid port (12h) for facilitating supply of hydraulic fluid to stroke said primary piston (30, 70) in said primary cylinder (15), the secondary piston (20, 22) comprising a secondary shaft (22) and a secondary piston head (20) arranged in a secondary cylinder (16) having a is secondary cylinder head (14) and provided with a hydraulic fluid -port (40e) for facilitating supply of hydraulic fluid to stroke said secondary piston (20) in said secondary cylinder (16), the secondary piston (20, 22) arranged to act on said primary piston (30, 70), characterised in that said secondary piston (20, 22) further comprises a member (40) movable to an engaged position to act between the primary shaft and the secondary cylinder head (14) to lock the primary shaft (70) in an extended position.
L'invention porte sur une commande de piston hydraulique d'obturateur d'éruption, comportant un piston primaire (30,70) et un piston secondaire (20,22). Le piston primaire (30,70) comprend un arbre primaire (70) et une tête (30) de piston coulissant dans un cylindre primaire (15) dont la tête (13) comporte un orifice (12h) d'admission du fluide hydraulique qui propulse le piston primaire (30, 70) dans le cylindre primaire (15). Le piston secondaire (20,22) comprend un arbre secondaire (22) et une tête (20) de piston coulissant dans un cylindre secondaire (16) dont la tête (14) comporte un orifice (40e) d'admission du fluide hydraulique qui propulse le piston primaire (20, 22) dans le cylindre primaire (16). Le piston secondaire (20,22) qui agit sur le piston primaire (30,70), comporte en outre un élément (40) pouvant prendre une position de verrouillage où il agit sur l'arbre primaire et sur la tête (14) du cylindre secondaire pour verrouiller l'arbre primaire (70) en position sortie.
Mcfadden Fincham
Varco I/p Inc.
LandOfFree
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