Low pressure stem gas seal

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

Patent

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Details

F16K 41/14 (2006.01) F16K 43/00 (2006.01)

Patent

CA 2540282

A backup stem seal for a gate valve retains pressure in the body when the valve is in the closed position. The backup seal is secondary to the main stem seal assembly (20) in the bonnet (12). It features metal-to-metal contact between surfaces (22, 24) that are radially oriented or sloping and further can contain a retaining groove (26) for a seal ring (32) in one or both the opposed metal-to-metal surfaces (22, 24). The groove (26) can be formed to better retain the ring (32) from damage from flowing fluids when the valve is open. A passage through the bonnet (34) may be used to test for leakage past such seal. The backup seal allows maintenance of the main stem seal (20) without removing the valve from service.

Joint d'étanchéité secondaire de tige de clapet servant à maintenir la pression dans le corps quand le clapet est en position de fermeture. Ce joint est secondaire par rapport à l'ensemble principal d'étanchéité (20) de la tige de clapet située dans le capot (12). Ceci crée un contact métal contre métal entre des surfaces (22, 24) orientées ou inclinées dans un sens radial et peut également contenir une gorge de retenue (26) de bague d'étanchéité (32) dans une ou dans les deux surfaces opposées (22, 24) métal contre métal. Cette gorge (26) peut être conçue de façon à améliorer la protection de la bague (32) contre la détérioration provenant de l'écoulement de liquides quand le clapet est ouvert. Un passage à travers le capot (34) peut être utilisé pour vérifier les fuites au niveau de ce joint. Ce joint secondaire permet d'effectuer la maintenance du joint principal (20) d'étanchéité de la tige du clapet sans retirer ce dernier ni empêcher son fonctionnement.

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