Patent ID: 7651330

Claim:
A valve comprising: a valve body having a rotatable regulating organ positioned between a valve inlet and a valve outlet, the regulating organ configured to vary the flow rate of the gaseous fuel at the valve outlet as a function of an angular position of the regulating organ, a first angular position of the regulating organ determining a first minimum flow rate of a first predetermined type of gas, and a second angular position of the regulating organ, successive to the first angular position, determining a second minimum flow rate of a second predetermined type of gas; and a control knob used to manipulate the angular position of the regulating organ coupled to the regulating organ by an actuating shaft, the control knob having a feature co-operable with a part of an appliance to which the valve is to be attached to prevent rotation of the regulating organ beyond the first angular position, absent the presence of the feature on the control knob the regulating organ is rotatable to the second angular position.