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US 2006/0213560 A1Published application
Valve and a gas burner
AssigneeCannemara Innovation Limited
InventorGianmario Invernizzi
Life of this patent
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AssigneeCannemara Innovation Limited
InventorGianmario Invernizzi
Estimating the term…
A valve (1) for supplying fuel gas to a fuel gas appliance comprises a valve housing (2) which defines a valve chamber (3) within which a main carrier member (20) is axially moveable along a main central axis (4). The main carrier (20) carries a primary valving member (21) and a secondary valving member (22) for co-operating respectively with a primary valve seat (10) and a secondary valve seat (15) for controlling the flow rate of the fuel gas through the valve chamber (3) from a fluid inlet (5) to a main fluid outlet (6). A pilot fluid outlet (7) supplies fuel gas to a pilot jet. A stepper motor (35) comprising a rotor (70) and four independently powered magnetic coils (67) disposed at 90° intervals around the rotor (70) urges the main carrier (20) between a fully open and a closed position in the direction of the arrows B and A, respectively through a screw-drive transmission (37). An electro-magnetic coil (47) located in the main carrier (20) magnetically couples primary and secondary end plates (44,45) to the main carrier (20) when energised. Magnetic decoupling of the primary and secondary end plates (44,45) from the main carrier (20) permits the main carrier (20) to be urged into the closed position by the action of primary compression springs (53,54). The drive transmission (37) comprises a drive shaft (72) from the rotor (70) of the stepper motor (35) and a drive spindle (76) which is retained captive in the main carrier (20) when the primary end plate (44) is magnetically coupled to the main carrier (20). External threads (80) on the drive spindle (76) co-operate with internal threads (78) on the drive shaft (72) for urging the main carrier (30) between the open and closed positions. The respective threads (78,80) are arranged so that when ends (83,84) of the threads (80,78), respectively are disengaged a datum condition of the stepper motor (35) is established for synchronizing the stepper motor (35) with the main carrier (20) so that the absolute position of the main carrier (20) can be determined by recording the steps and respective directions of the rotor (70) from the datum condition.
A valve comprising a housing (2) defining a valve chamber (3), and a valve seat (10, 15) in the valve chamber (3), a fluid inlet (5) to the valve chamber (3), and a fluid outlet (6, 7) from the valve chamber, the fluid outlet communicating with the fluid inlet through a fluid passageway (13, 16) defined by the valve seat (10, 15), a valving member (21,22) co-operable with the valve seat (21,22) and being moveable between a closed position in engagement with the valve seat for closing the fluid passageway, and a fully open position spaced apart from the valve seat for permitting fluid flow through the fluid passageway, wherein an intermediate valve member (201) is located adjacent the valve seat (15) and is moveable relative thereto, the intermediate valve member (201) being engageable with and moveable with the valving member (22) during movement of the valving member (22) when the valving member (22) is moving in close proximity to the valve seat (15), and being co-operable with a portion (15) of the housing (2) so that as the intermediate valve member (201) is engaged with and is moving with the valving member (22) the flow rate of fluid through the fluid passageway (16) is progressively altered by the co-operating action of the intermediate valve member (201) and the housing (2).
Dependencies are inferred from the claim text.