Stuffing box for a valve

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

Patent

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Details

F16K 49/00 (2006.01) F16K 41/02 (2006.01)

Patent

CA 2405903

The invention relates to a valve that contains a piston (2) linked with the valve body (8) and received in a housing (4), and a stuffing box (14) interposed between the piston (2) and the housing (4). The stuffing boxes of valves used for media having a high melting point and being operated close to the melting point risk being damaged by so-called freezing medium due to the adhesive properties of the medium in temperature ranges below the melting point. The aim of the invention is therefore to improve such a valve with few constructive efforts in such a manner that the material of the stuffing box reliably works in the liquid range of the medium. To this end, the housing (4) is provided with a heating device (16) in the area of the stuffing box (14). The axial length of said heating device is larger than the axial length of the stuffing box (14), and the heating device (16) axially protrudes beyond an axial end (22) of the stuffing box (14) by a predetermined length (24, 28).

L'invention concerne une soupape contenant un piston (2) relié à un corps de soupape (8) et logé dans une enveloppe (4), ainsi qu'un presse-étoupe (14) situé entre le piston (2) et l'enveloppe (4). Dans les soupapes destinées à un milieu présentant un point de fusion élevé et lorsqu'on opère à proximité du point de fusion, il existe un risque d'endommagement du presse-étoupe par le milieu qui </= gèle >/= , en raison des propriétés adhésives du milieu dans des plages de températures inférieures au moins de fusion. L'invention vise donc à développer la soupape tout en maintenant une dépense de conception faible afin que le matériau du presse-étoupe opère de manière sûre dans la plage liquide du milieu. A cet effet, l'enveloppe (4) comprend, dans la zone du presse-étoupe (14), un dispositif de chauffage (16) dont la longueur axiale est supérieure à la longueur axiale du presse-étoupe (14) et qui dépasse axialement au moins une extrémité axiale (22) du presse-étoupe (14) sur une longueur prédéfinie (24, 28).

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