Fuel regulating valve

Claim 2

A regulating valve assembly for an oil burner, comprising: supply passage means, burner nozzle outlet passage means, a main regulating valve for controlling the flow of fluid in said outlet passage means, and valve means for controlling the flow of fluid to said main regulating valve to provide a rapid closure thereof when flow in said supply passage decreases below a predetermined value, means for controlling the valve means including an automatically variable size orifice in said supply passage means, and means responsive to the pressure at said orifice for controlling said valve means.

Claim 3

A regulating valve assembly as defined in claim 1, wherein said orifice includes a generally circular opening communicating with said supply passage means, and a spring-biased valve member in said opening.

Claim 4

A regulating valve assembly as defined in claim 2, wherein said opening has a valve seat for said valve member constructed to close said supply passage when the valve member is seated, one of said opening and valve member being tapered so that the area of the orifice increases as the valve member moves away from the seat in opposition to its biasing force.

Claim 5

A regulating valve assembly as defined in claim 3, wherein the taper is sufficient to maintain a predetermined pressure drop across said ball valve at flow rates above a predetermined value.

Claim 6

A regulating valve assembly as defined in claim 1, wherein said automatically variable size orifice is constructed to provide a variable flow area, at flow rates in said supply passage means above a predetermined value, to maintain a substantially constant pressure drop across said orifice.

Claim 7

A regulating valve assembly as defined in claim 1, wherein said valve means includes a diaphragm valve having a low pressure outlet port, a control port and an inlet port, means communicating the supply passage means upstream of said orifice to said control port in a direction tending to close said outlet port, said inlet port communicating with said main regulating valve means and said supply passage means downstream of said orifice, whereby the pressure drop across said orifice tends to close said valve means and at a predetermined decrease in flow in said supply passage means permits the diaphragm valve to open porting fluid from said regulating valve means to said outlet port thereby permitting rapid closure of said regulating valve.

Claim 8

A regulating valve assembly for a fuel oil burner, comprising: supply passage means for supplying fluid under pressure, a maiN regulating valve including a burner nozzle outlet port, a movable valve member, means biasing said valve member to a position closing said burner nozzle outlet port, said movable valve member defining a chamber when pressurized tending to open said movable valve member, said supply passage means communicating with said chamber to supply fluid thereto, valve means for venting said chamber upon a reduction in flow of fluid in said supply passage means to permit rapid closure of said movable valve member, and means for controlling said valve means including a variably sized orifice in said supply passage means, said orifice being responsive to flow rates in said supply passage means above a predetermined value for increasing the area thereof and maintaining a substantially constant pressure drop across said orifice, said valve means being responsive to the pressure drop across said orifice.

Claim 9

A regulating valve assembly for a fuel oil burner, comprising: supply passage means for supplying fluid under pressure, a maiN regulating valve including a burner nozzle outlet port, a movable valve member, means biasing said valve member to a position closing said burner nozzle outlet port, said movable valve member defining a chamber when pressurized tending to open said movable valve member, said supply passage means communicating with said chamber to supply fluid thereto, valve means for venting said chamber upon a reduction in flow of fluid in said supply passage means to permit rapid closure of said movable valve member, and means for controlling said valve means including a variably sized orifice in said supply passage means, said orifice being responsive to flow rates in said supply passage means above a predetermined value for increasing the area thereof and maintaining a substantially constant pressure drop across said orifice, said valve means being responsive to the pressure drop across said orifice.

Claim 10

A regulating valve assembly for a fuel oil burner as defined in claim 7, wherein said orifice includes an opening communicating with said supply passage means, a valve member in said opening of smaller diameter than said opening so that the orifice is defined by the annular space between the valve member and the opening.

Claim 11

A regulating valve assembly, comprising: supply passage means for supplying fluid under pressure, a main regulating valve including a burner nozzle outlet port, a valve member biased to a position closing said burner nozzle outlet port and defining a valve chamber which when pressurized tends to open said valve member, said supply passage communicating with said chamber, valve means for controlling the fluid pressure in said chamber to permit the rapid closure of said valve member including a diaphragm operated valve, means responsive to fluid flow in said supply passage means for controlling said diaphragm operated valve.

Claim 12

A regulating valve assembly, comprising: supply passage means for supplying fluid under pressure, a main regulating valve including a burner nozzle outlet port, a valve member biased to a position closing said burner nozzle outlet port and defining a valve chamber which when pressurized tends to open said valve member, said supply passage communicating with said chamber, valve means for controlling the fluid pressure in said chamber to permit the rapid closure of said valve member including a diaphragm operated valve, means responsive to fluid flow in said supply passage means for controlling said diaphragm operated valve.

Claim 13

A regulating valve assembly as defined in claim 9, wherein said diaphragm operated valve includes a valve chamber having a low pressure outlet port on one side thereof, a diaphragm in said chamber having a valve surface adapted to close said outlet port, an inlet port on the same side of the diaphragm as said outlet port, a control port on the opposite side of the diaphragm, an orifice in said supply passage means, first passage means communicating said supply passage means upstream of said orifice with said control port, second passage means communicating said supply passage means downstream of said orifice with said inlet port, and means biasing said diaphragm to an open position whereby upon flow in said supply passage means below a predetermined valve the biasing means will open said outlet port depressurizing the main valve chamber and upon flow in said supply passage means above a predetermined value the pressure drop across the orifice will cause closure of said diaphragm valve and the rapid buildup of pressure in said main valve chamber.

Claim 14

A regulating valve assembly, comprising: supply passage means for supplying fluid under pressure, a main regulating valve including a burner nozzle outlet port, a valve member biased to a position closing said burner nozzle outlet port and defining a valve chamber which when pressurized tends to open said valve member, said supply passage communicating with said chamber, valve means for controlling the fluid pressure in said chamber to permit the rapid closure of said valve member including a valve member for venting said chamber when in an open position, means responsive to fluid flow in said passage means for controlling said valve member, and spring means for urging said valve member away from a closed position toward its open position, said spring having a force to length characteristic such that it exerts a greater opening force on said valve member as the latter moves away from its closed position to assure rapid opening of said valve member.

Claim 15

A regulating valve assembly, comprising: supply passage means for supplying fluid under pressure, a main regulating valve including a burner nozzle outlet port, a valve member biased to a position closing said burner nozzle outlet port and defining a valve chamber which when pressurized tends to open said valve member, said supply passage communicating with said chamber, valve means for controlling the fluid pressure in said chamber to permit the rapid closure of said valve member including a valve member for venting said chamber when in an open position, means responsive to fluid flow in said passage means for controlling said valve member, and spring means for urging said valve member away from a closed position toward its open position, said spring having a force to length characteristic such that it exerts a greater opening force on said valve member as the latter moves away from its closed position to assure rapid opening of said valve member.

Claim 16

A regulating valve assembly as defined in claim 11, wherein said spring means is a Belleville spring.

Claim 17

A regulating vaLve assembly as defined in claim 9, including spring means for urging said diaphragm valve away from a closed position toward an open position and having a force-to-length characteristic such that it exerts a greater opening force on the valve member as the latter moves away from its closed position to provide quick action opening.

Claim 18

A regulating valve assembly as defined in claim 13, wherein conversely said spring means has a force-to-length characteristic such that it exerts a lesser opening force on said valve member as the latter moves toward its closed position to provide quick-action closing.

Claim 19

A regulating valve assembly as defined in claim 7, including spring means urging said vent valve means away from a closed position toward an open position and having a force-to-length characteristic such that it exerts a greater opening force on the valve means as the latter moves toward open, and a lesser opening force as it moves toward closed.