Retainer lock nut for the stem packing of a fluid pressure...

F - Mech Eng,Light,Heat,Weapons – 16 – K

Patent

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Details

F16K 31/126 (2006.01) F16K 41/04 (2006.01)

Patent

CA 2495679

A control valve includes a valve body (14) defining a top opening. A bonnet (28) is provided for closing off the top opening of the valve body. A stem (40) housed in the bonnet and the valve housing slidably moves a valve plug (30) in the valve housing to open and close the valve. A packing assembly (44) is provided for sealing between the stem and bonnet, and a packing retainer maintains the packing assembly within the bonnet. A retainer ring (12) is provided for securing the packing retainer (48) in place. The retainer ring can be formed as a generally cylindrical ring that engages the packing retainer and can be tightened on the packing retainer. Outer notches (56) formed in an exterior surface of the lock nut provide for tightening of the lock nut with a tool. In addition, the retainer ring may include a lower portion that closely receives an outer surface of the packing retainer, thereby to center the retainer ring with the packing retainer. Still further, the retainer ring may have an upper portion that automatically centers the retainer ring with the bonnet.

Une vanne de commande comprend un corps de vanne (14) définissant un orifice supérieur. Un chapeau (28) permet de fermer l'orifice supérieur du corps de vanne. Une tige (40) logée dans le chapeau et dans le logement de vanne déplace, en coulissant, un tournant (30) dans le logement de la vanne destiné à fermer ou à ouvrir la vanne. Un assemblage de garniture (44) permet de réaliser l'étanchéité entre la tige et le chapeau, et une retenue de garniture maintient l'assemblage de garniture à l'intérieur du chapeau. Une bague de retenue (12) fixe la retenue de garniture (48) en place. La bague de retenue peut être formée comme une bague généralement cylindrique engageant la retenue de garniture et pouvant être serrée sur la retenue de garniture. Des encoches extérieures (56) pratiquées dans une surface extérieure de l'écrou de blocage permettent de serrer cet écrou avec un outil. La bague de retenue peut comprendre, en outre, une portion inférieure recevant de façon rapprochée une surface extérieure de la retenue de garniture, ce qui permet de centrer la bague de retenue avec la retenue de garniture. La bague de retenue peut encore comporter une portion supérieure servant à centrer automatiquement la bague de retenue avec le chapeau.

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