Pressure-reducing valve

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

Patent

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Details

F16K 31/128 (2006.01) F16K 31/365 (2006.01) F16K 51/00 (2006.01)

Patent

CA 2696770

A pressure-reducing valve is provided in which a diaphragm rod connected to a valve body of a valve mechanism is connected to a central part of a diaphragm having its peripheral edge part clamped between a body and a diaphragm cover, wherein the diaphragm (28) is formed from a disk-shaped rubber sheet for which the sheet thickness of at least its peripheral edge part is uniform in the natural state, and in a state in which the diaphragm cover (17) is fixed to the body (16) so that the peripheral edge part of the diaphragm (28) is compressively held between a collar portion (17b) of the diaphragm cover (17) and a clamping face (91) of the body (16), a portion having, of the gap between the collar portion (17b) and the clamping face (91), a minimum gap is positioned further inward in the radial direction of the diaphragm (28) than a portion having a maximum gap. This enables the sealing properties and the pull--out resistance for the diaphragm to be guaranteed while achieving a reduction in weight and a reduction in cost.

L'invention concerne une vanne de réduction de pression dans laquelle une tige de membrane placée au voisinage d'un corps de vanne d'un mécanisme de vanne est couplée au centre d'une membrane dont un bord périphérique est maintenu entre un corps et un élément de recouvrement de membrane. La membrane (28) est structurée à partir d'une plaque de caoutchouc en forme de disque dont l'épaisseur, au moins au niveau de son bord périphérique, est uniforme dans un état naturel. Le bord périphérique de la membrane (28) est comprimé et est maintenu entre un rebord (17b) de l'élément de recouvrement de membrane (17) et une surface de maintien (91) du corps (16), et l'élément de recouvrement de membrane (17) est ainsi fixé au corps (16). Dans cet état, la partie de la membrane (28) qui est située entre le rebord (17b) et la surface de maintien (91) et au niveau de laquelle l'espace existant entre eux est le plus petit est située sur le côté radialement intérieur de la partie de membrane (28) au niveau de laquelle l'espace est le plus grand. La structure réduit le poids et le coût de la membrane de réduction de pression, améliore la capacité d'étanchéité de la membrane et empêche que la membrane ne sorte de sa place.

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