Full flow mechanical failsafe

B - Operations – Transporting – 01 – D

Patent

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Details

B01D 46/42 (2006.01) B01D 35/147 (2006.01)

Patent

CA 2384426

A full-flow mechanical failsafe (100) is composed of a cylindrical shell (101) having a movable sealing plug (105) therein, for attachment to a filter element (110) of a fluid filtering system, such as a gas clean up system in a power plant. The sealing plug (105) rests on locking spheres (107) within the shell (101) during normal operation. Upon filter failure or breakage, the flow fluid will be substantially increased, causing an increase in upward pressure against the sealing plug (105), forcing it upward off the spheres (107) and into sealing contact with a flow aperture (102, 103), shutting off fluid flow. The spheres (107) move downward into a lock-ing position upon movement of the sealing plug (105), to se-cure the sealing plug (105) in its upward sealing position. The failsafe (100) can be used in fluid flow control systems other than fluid filtering systems, such as oil or gas pipelines, and can be used to prevent improper reverse fluid flow.

L'invention porte sur un dispositif de sécurité (100) sur circuit principal comportant une enceinte cylindrique (101) munie d'un obturateur mobile (105) intérieur fixé à l'élément filtrant (110) d'un système de filtrage de fluides, tel que le système d'épuration des gaz d'une centrale électrique. En fonctionnement normal, l'obturateur (105) repose sur des sphères de verrouillage (107) intérieures à l'enveloppe (101). En cas de défaillance ou de rupture le débit de fluide croit sensiblement et entraîne une élévation de la pression amont s'exercent sur l'obturateur (105), qui l'écarte vers le haut des sphères (107) et le met en contact étanche avec l'orifice d'écoulement (102, 103), interrompant ainsi le débit du fluide. Les sphères (107) s'abaissent en position de verrouillage lorsque l'obturateur (105) se déplace et le maintiennent en position haute de fermeture. Le dispositif de sécurité (100) peut s'employer sur des installations autres que de filtrage, tels que des oléoducs et des gazoducs et servir à empêcher des inversions de flux non conformes.

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