Valve having pressure equalizing conduit

Details Valve having pressure equalizing conduit Valve having pressure equalizing conduit

F - Mech Eng,Light,Heat,Weapons

16

K

F16K 17/168 (2006.01) E21B 33/06 (2006.01) F16K 39/06 (2006.01)

Patent

CA 2218030

Pressure can build up on one side of a valve bore sealing mechanism when it is closed. This can make the mechanism difficult to open. A bore network is provided which extends through the valve housing side wall from the inlet end of the valve bore to its outlet end. The network bypasses the sealing mechanism and its sealing areas. Needle valves, operative from outside the valve, are used to open or close the network. The network can be temporarily opened to enable pressure to equalize across the closed sealing mechanism, thereby freeing the mechanism so that it can be turned.

La pression peut s'accumuler d'un côté du mécanisme d'obturation d'un orifice de vanne lorsqu'il est fermé, ce qui peut rendre l'ouverture du mécanisme difficile. Une canalisation partant de l'entrée de l'orifice et traversant la paroi du corps de la vanne contourne le mécanisme de fermeture et ses surfaces de fermeture. Des robinets à aiguille manoeuvrables de l'extérieur de la vanne permettent d'ouvrir ou de fermer la canalisation. Celle-ci peut être ouverte temporairement pour permettre l'équilibrage de la pression de part et d'autre du mécanisme de fermeture, libérant ainsi le mécanisme pour qu'il puisse être tourné.

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