Valve arrangement for pressure regulation of fuel supply in an internal combustion engine

A valve arrangement for pressure regulation of fuel introduction to an internal combustion engine having pressure regulating and shutoff functions, comprising a housing provided with at least one inlet connection and at least one outlet connection connected by a connection channel, an electromagnetic drive comprising an armature which acts on a tappet supporting a closing element, which opens or closes the connection channel, and at least one pressure spring acting on the closing element in a closing direction of the connection channel, wherein pressure force of said at least one spring and of said armature are adapted to close the connection channel by said closing element with a defined force when the electromagnetic drive is not energized, and wherein when the electromagnetic drive is energized, said connection channel remains closed but pressure of said at least one spring in the closing element is reduced by a determined amount.

A valve arrangement for pressure regulation of fuel introduction to an internal combustion engine having pressure regulating and shutoff functions, comprising a housing provided with at least one inlet connection and at least one outlet connection connected by a connection channel, an electromagnetic drive comprising an armature which acts on a tappet supporting a closing element, which opens or closes the connection channel, a pressure spring acting on the closing element in a closing direction of the connection channel wherein when the electromagnetic drive is energized, said connection channel is closed at a high pressure produced by the spring and the armature together whereas when the electromagnetic drive is de-energized, the connection channel remains closed by the closing element at a low pressure produced by said spring alone.

A method of controlling pressure in a line at two different pressure levels comprising controlling pressure in the line by connecting to the line a valve having a closure element which is closed and pressurized at two different pressure levels by a spring means and an electromagnetic drive depending on whether or not the electromagnetic drive is energized.

A fuel circuit comprising a fuel tank, a low pressure pump for delivering fuel at a determined pressure value to a high pressure pump which supplies fuel to a fuel distributor and a valve connected between the low and high pressure pumps to control pressure of the fuel delivered to the high pressure pump at two distinct values, said valve comprising a closure element which is biased to a closing position at said two distinct pressure values by a spring means and an electromagnetic drive, depending on whether or not the electromagnetic drive is energized, said closure element acting at said two distinct pressure values to limit pressure in said line to said two distinct values.