Patent ID: 6672517
Filing Date: 2004-01-06
Classification: F23K

Abstract:
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).