VALVE DEVICE AND USE OF SUCH A VALVE DEVICE AS AN ANTI-SIPHON VALVE IN AN INTRAVENOUS SYSTEM

Abstract

A valve device (100; 200; 300) is described. The valve device is configured to be set from an open or closed state to a forced open state. The valve device (100; 200; 300) allows fluid flow in a downstream direction in the open state from a proximal end (2a; 202a; 302a) of the housing (1; 201; 301) to a distal end (2b; 202b; 302b) of the housing (1; 201; 301) and restricts fluid flow in an upstream direction in the closed state from the distal end (2b; 202b; 302b) to the proximal end (2a; 202a; 302a) of the housing (1; 201; 301). When the valve device (100; 200; 300) is selectively set to the forced open state, fluid flows upstream from the distal end (2b; 202b; 302b) to the proximal end (2a; 202a; 302a) of the housing (1; 201; 301) is allowed.When the valve device (100; 200; 300) is selectively adjusted from an open or closed state to a forced open state by changing the length of a flexible tube (11; 211; 311), as seen between its first fixing part (25; 225; 325) and its second fixing part (26; 226; 326), a piston (16; 216; 316) is moved relative to the housing (1; 201; 301).