Patent ID: 6308895
Filing Date: 2001-10-30
Classification: G05D,Y10T

Abstract:
A gas flow control valve for a room heating appliance, with a valve member of the lift type in a cylindrical gas chamber, controlling the gas flow from an inlet conduct to an outlet conduct of the valve, wherein the valve modulates the gas flow supplied from said outlet conduct to the heating appliance in accordance with the ambient temperature measured, comprising:a stepped motor for actuating an axially sliding valve stem and an electronic control unit attached to the motor for energizing and control of the motor;a first valve member and a second valve member coupled in series to the valve stem, defining at least a gas chamber between the inlet and outlet conducts, that act successively on a respective valve seat for the delivery of the gas supply between a minimum flow and a maximum flow, by means of variation in the axial displacement of the stem;wherein said control unit attached to the motor has various valve actuating programs recorded, each program comprising various operating modes relating to the gas flow supply in association with the forward movement of the valve stem, the extent of the displacement of which is determined by means of the combination of the emplacement of each of the valve members in relation to its respective valve seat with the position of the second valve member relative to the inlet conduct.