Patent ID: 6968853

Claim:
A motor-operated valve for regulating a gas flow adapted for the supply of a main gas flow and a pilot gas flow to an environmental heating appliance, comprising: a valve body ( 4 ) with a gas inlet conduit ( 6 ), an axial flow conduit ( 5 ) and a plurality of gas outlet conduits ( 7 , 8 , 20 ) transverse to said axial flow conduit; a valve spindle ( 10 , 10 a ) that slides linearly along said axial flow conduit ( 5 ) and at least one cut-off member ( 11 ) provided with a return spring ( 17 ) coupled to the valve spindle ( 10 ) to modulate a gas flow ( 3 ) directed to a main outlet conduit ( 8 ); a motor ( 9 ) coupled on the valve body for actuating the valve spindle and its axial movement in both directions; a flame safety valve ( 14 , 15 ) provided with a magnetic assembly ( 14 ) located on one side of the valve body opposite the motor ( 9 ) and in series with the inlet conduit ( 6 ): wherein the valve spindle ( 10 , 10 a ) is a one-piece stem actuated directly by the motor for its linear movement in an initial axial direction, extending from the motor and pushing the safety valve ( 14 , 15 ) to open it initially, and in a second axial direction (e), retracting for the raising of at least said modulating cut-off member ( 11 ); safety cut-off means ( 21 - 24 ) to prevent the flow of gas towards all of the outlet conduits ( 7 , 8 , 20 ) in case the movement of the spindle ( 10 ) is locked because of the motor, wherein said cut-off means are housed in the central flow conduit ( 5 ) and are operated by the spindle ( 10 ), in a position between the inlet conduit ( 6 ) and the outlet conduits ( 7 , 8 , 20 ), whereby in a forward movement (e) of the spindle ( 10 ), a free end ( 10 a ) of the spindle ( 10 ) is separated from the safety magnetic assembly ( 14 ) and, as the flame safety valve is open, the flow of gas to all of the outlet conduits ( 7 , 8 , 20 ), are kept shut off by the safety cut-off means ( 21 - 24 ), while the flame safety valve ( 14 , 15 ) remains open.