US 6,672,517 B1 · Valve for fuel burner

Abstract

The invention relates to a system made of an oil pump and of a magnet valve for preventing oil from dripping when the oil burner is switched off. The inventive system is provided with an oil pump (23) and a magnet valve (10) which has a closing body (16) that comprises an oil flow borehole (17). The closing body (16) is displaceably located in a borehole (12). An oil line (11) goes through the borehole (12). The oil flow borehole (17) of the closing body (16) complements the oil line (11) in a first position of the inventive magnet valve (10). The oil flow is thus released. The closing body (16) interrupts the oil line (11) in a second position of the magnet valve (10). A vacuum is simultaneously generated in said second position. The vacuum reverses the direction of oil flow in an end section (15) of the oil line (11). The oil is thus prevented from dripping.

Claims19

Dependent claims

A valve (10) for controlling the flow of a liquid through a delivery line (11), the valve comprising:

a body, the body having bore (12) for receiving a closing body (16), the closing body (16) having a passage bore (17) which selectively passes the liquid from an upstream portion of the delivery line (11) to a downstream portion of the delivery line (11), wherein
when the valve (10) is in a first position, a center axis (18) of the passage bore (17) coincides with a center axis (19) of the delivery line (11) at least in the region of the bore (12) such that the passage bore (17) of the closing body (16) completes the delivery line (11) and thus releases flow of the liquid from the upstream portion of the delivery line (11) to the downstream portion of the delivery line (11), and wherein
when the valve is in a second position, the closing body (16) interrupts the flow of the liquid from the upstream portion of the delivery line (11) to the downstream portion of the delivery line (11), generates a negative pressure in at least part of the bore (12) which is in fluid communication with at least part of the downstream portion of the delivery line, and thus at least temporarily reverses the flow of the liquid in at least a portion of the downstream portion (15) of the delivery line (11).

A valve (10) for controlling the flow of a liquid through a delivery line (11), the valve comprising:

a body, the body having bore (12) defined by side walls and at least one end wall, the bore (12) receiving a closing body (16), the closing body (16) having a passage (17) which selectively passes the liquid from an upstream portion of the delivery line (11) to a downstream portion of the delivery line (11), wherein
when the valve (10) is in a first position, the passage (17) of the closing body (16) completes the delivery line (11) and thus releases a flow of the liquid from the upstream portion of the delivery line (11) to the downstream portion of the delivery line (11), and wherein
when the valve is in a second position, the closing body (16) interrupts the flow of the liquid from the upstream portion of the delivery line (11) to the downstream portion of the delivery line (11), and generates a negative pressure in a reception space (20) created in the bore (12) between the closing body (16) and the body, wherein the reception space (10) is in fluid communication with at least part of the downstream portion of the delivery line via an orifice that extends though at least part of the end wall of the bore (12), and thus at least temporarily reverses the flow of the liquid in at least a portion of the downstream portion (15) of the delivery line (11).

Dependencies are inferred from the claim text.

Valve for fuel burner

Life of this patent

Valve for fuel burner

Life of this patent

Abstract

Claims19