Patent ID: 7201186

Claim:
A gas flow regulating valve adapted to one cooking burner amongst several on a cooking hob, comprising: a hollow valve body ( 2 ) forming a cylindrical-shaped gas circulation chamber ( 3 ) on the inside, with a gas inlet conduit ( 4 ) from a source and an outlet conduit ( 5 ) from the valve, a step motor (M) coupled at a one end of the valve body ( 2 ) by means of a valve shaft ( 6 ) coaxial with a valve body centreline ( 1 a ), a valve closure member ( 8 ), provided with sealing means ( 8 a , 8 b , 8 c ) so as to define an inlet side ( 3 a ) and the outlet side ( 3 b ) of the gas chamber, and keep them isolated from each other, and which, being held in a fixed position relative to said valve body ( 2 ), is provided with a central through-hole ( 16 ) for gas flow (Q) from said inlet side ( 3 a ) towards said outlet side ( 3 b ), a regulating valve member ( 7 ) cylindrical-shaped, whose axial movement (X) through said closure member ( 8 ) is controlled by motor (M) over a whole stroke (St) of successive positions (P) relative to the closure member ( 8 ) between two extreme positions (P 0 , P 6 ), effecting the regulation of an outlet gas flow (Q) between the flow shut-off (OFF), a maximum flow (Qmax), a graduated intermediate flow (Qgra), and a minimum flow (Qmin), depending on the length (Xm, Xg) of the movement (X) made, said cylindrical regulating member ( 7 ) is provided with at least one elongated superficial recess ( 9 , 9 ′) for the passage of the gas flow (Q), communicating the inlet side ( 3 a ) with the outlet side ( 3 b ) by way of said centre hole ( 16 ) in the closure member, a surface opening ( 9 , 11 ) for gas passage provided with a surface groove ( 9 , 11 ) adjacent to said communication superficial recess ( 9 ) at the outlet side ( 3 b ), and configured in the form of a groove extending in the axial direction, the through-flow area (A) thereof being open in a layout convergent towards said outlet side ( 3 b ) for the regulation of the intermediate flow (Qgra), wherein said superficial recess ( 9 , 9 ′), after a prior initial movement (OFF-P 0 ) of the regulating member ( 7 ), is partly open towards the inlet side ( 3 a ) and towards the outlet side ( 3 b ) as well, so as to establish the predetermined flow Qmax, and said regulating surface groove ( 9 , 11 ) being of longitudinally variable section, is gradually opened to the output chamber ( 3 b ) in accordance with a second regulated movement (Xr) between two relative positions (P 3 , P 5 ), for the supply of an intermediate flow (Qgra) between said predetermined flows Qmax and Qmin, according to the output (W 1 , W 2 ) of the cooking burner chosen and the gas family supplied.