A gas valve with ceramic disc element

Abstract

The invention relates to a gas valve unit, comprising a body having an inlet channel and an outlet channel in gas flow connection via an inner chamber surrounded by body a stationary disc element fixed in the inner chamber and having a through hole thereon that opens into the gas outlet channel ; a rotating disc element with an inner wall rotatably overlapping a front wall of the stationary disc element and a cavity that access to the outlet channelthrough the through holewhen rotated. The front wall and the inner wall of the stationary disc elementand the rotating disc element facing each other, respectively, are at least partially made of ceramic material.

1 . A gas valve comprising a body having an inlet channel and an outlet channel in gas flow connection via an inner chamber surrounded by body ; a stationary disc element fixed in the inner chamber and having a through hole thereon having access to the gas outlet channel ; a rotating disc element with an inner wall overlapping a front wall of the stationary disc element in a rotatable manner and a cavity that reach the outlet channel through the through hole when rotated characterized in that the front wall and the inner wall of the stationary disc element and the rotating disc element facing each other, respectively, are at least partially made of ceramic material. 
     
     
         2 . The gas valve according to  claim 1 , wherein the stationary disc element and the rotating disc element are made of solid ceramic material. 
     
     
         3 . The gas valve unit according to  claim 1 , wherein a rear wall is provided parallel to the front wall and the stationary disc elementis coupled by a peripheral wall between the front wall and the rear wall through a retainer wall forming the inner wall of the inner chamber . 
     
     
         4 . The gas valve unit according to  claim 3 , wherein a flexible gasket is compressed towards the gas outlet channelon the planar rear wall such that it surrounds the through hole in a gas-tight way. 
     
     
         5 . The gas valve unit according  claim 1 , wherein an oil film is provided between the front wall and the inner wall ,surrounding the through hole and the cavity in a gas-tight way and adjusted to a predetermined viscosity so as to allow rotation on one another. 
     
     
         6 . The gas valve unit according to  claim 5 , wherein a plurality of pockets are provided on the inner wall and store the oil droplet inside so as to feed the oil film during the rotation of the rotating disc element . 
     
     
         7 . The gas valve unit according to  claim 1 , wherein a control rod extends vertically outward by being attached to an outer wall of the rotating disc element . 
     
     
         8 . The gas valve unit according to  claim 7 , wherein a cover surrounds the control rodfrom its upper part at one end and is fixed to the body at the other end. 
     
     
         9 . The gas valve unit according to  claim 8 , wherein a compression spring is adjusted within the cover such that it abuts against the inside of the cover from one end and presses the rotating disc element from the other end. 
     
     
         10 . The gas valve unit according to  claim 1 , wherein the stationary disc element and the rotating disc element are manufactured or coated from a material selected from the group consisting of alumina, silicon carbide, silicon nitride and zirconia. 
     
     
         11 . A gas cooker or heating device to which the gas valve unit is adapted according  claim 1 .