Patent ID: 8196897

Claim:
A gas tap comprising: a body containing a stationary groove for the inlet of gas from an exterior surface to an interior cavity of the body, the groove having a first portion with a first cross-sectional area and a second convergent portion having a length and at a first end adjacent to the first portion a maximum width dimension and at a second end a minimum width dimension, the body further having an outlet opening for the passage of gas out of the body, and a rotatable regulation member positioned within the interior cavity of the body having a passage opening for the inlet of gas from an exterior surface of the regulation member to an interior cavity of the regulation member, the passage opening including a first portion having a first cross-sectional area and a second portion having a second cross-sectional area smaller than the first cross-sectional area, the regulation member having an outlet opening in fluid communication with the outlet opening of the body, the regulation member rotatable between a first angular position corresponding to a closed position of the gas tap, a second angular position corresponding to a maximum permissible gas flow through the gas tap, a fourth angular position corresponding to a minimum permissible gas flow through the gas tap, and a variable third angular position between the second and fourth angular positions that corresponds to a variable intermediate gas flow through the gas tap, in the first angular position neither the first or second portions of the passage opening overlap with any portion of the groove, in the second angular position both the first and second portions of the passage opening entirely overlap with the first portion of the groove, in the third and fourth angular positions only the second portion of the passage opening overlaps with the groove and only with the convergent portion of the groove.