| 主权项 |
1. A regulation valve for supplying either a first type of gas or a second type of gas to a gas burner, the regulation valve comprising:
a valve body having a gas inlet, a rotary regulatory body housed in said valve body, the regulatory body having a first inlet orifice corresponding to a first minimum flow of the first type of gas, and a second inlet orifice corresponding to a second minimum flow of the second type of gas, the rotary regulatory body rotates about a rotation axis between at least first, second and third successive angular positions, the first angular position corresponding to an off position, the first inlet orifice situated in the rotary regulatory body so that it is aligned to face the gas inlet when the rotary regulatory body is in the second angular position, the second inlet orifice situated in the rotary regulatory body so that it is aligned to face the gas inlet when the rotary regulatory body is in the third angular position, a drive shaft attached to the rotary regulatory body, the drive shaft having a radially extending projection, and a stop element having a proximal end and a distal end, the stop element situated in a housing arranged with the valve body, the housing having a passage with a proximal end and a distal end, the stop element moveable along a length of the passage between a first position and a second position, in the first position the distal end of the stop element extends beyond the distal end of the passage to interact with the radially extending projection of the drive shaft to limit the angular rotation of the rotary regulatory body to the second angular position where the first inlet orifice is aligned to face the gas inlet, in the second position the distal end of the stop element does not extend beyond the distal end of the passage to interact with the radially extending projection of the drive shaft thereby permitting the rotary regulatory body to be rotated to the third angular position. |
