Valve device (100; 200; 300) comprising a housing (1; 201; 301) comprising a passage (4; 204; 304) extending between a proximal end (2a; 202a; 302a) and a distal end (2b; 202b; 302b) of the housing (1; 201; 301); a plunger (16; 216; 316) arranged to extend at least partly inside the passage (4; 204; 304) of the housing (1, 201; 301); a valve sealing member (8; 208; 308) arranged in the passage (4; 204; 304), the valve sealing member (8; 208; 308) together with the plunger (16; 216; 316) being configured to control a fluid flow through the passage (4; 204; 304); a flexible tubing (11; 211; 311) having a distal end (10b; 210b; 310b)fixedly arranged to the housing (1; 201;301), thereby forming a first fixing portion (25; 225;325) of the flexible tubing (11; 211; 311); wherein the plunger (16; 216; 316) having a proximal end (19a; 219a; 319a) being arranged to the flexible tubing (11; 211; 311), thereby forming a second fixing portion (26; 226; 326) of the flexible tubing (11; 211; 311); and a distal end (19b; 219b; 319b) configured to selectively act on the valve sealing member (8; 208; 308) for selectively setting the valve device (100; 200; 300) from an open state or a closed state to a forced open state; wherein the valve device (100; 200; 300) allowing a fluid flow in a downstream direction in the open state from the proximal end (2a; 202a; 302a) of the housing (1; 201; 301) to the distal end (2b; 202b; 302b) of the housing (1; 201; 301), and restricting a fluid flow in an upstream direction in the closed state from the distal end (2b; 202b; 302b) of the housing (1; 201; 301) to the proximal end (2a; 202a; 302a) of the housing (1; 201; 301); and wherein the valve device (100; 200; 300) upon being selectively set in the forced open state, a fluid flow in the upstream direction from the distal end (2b; 202b; 302b) of the housing (1; 201; 301) to the proximal end (2a; 202a; 302a) of the housing (1; 201; 301) is allowed; and wherein the valve device (100; 200; 300) is arranged to be selectively set from an open state or closed state to the forced open state by affecting the length of the flexible tubing (11; 211; 311) as seen between its first fixing portion (25; 225; 325) and its second fixing portion (26; 226; 326), thereby displacing the plunger (16; 216; 316) relative the housing (1; 201; 301). a housing (1; 201; 301) comprising a passage (4; 204; 304) extending between a proximal end (2a; 202a; 302a) and a distal end (2b; 202b; 302b) of the housing (1; 201; 301); a plunger (16; 216; 316) arranged to extend at least partly inside the passage (4; 204; 304) of the housing (1, 201; 301); a valve sealing member (8; 208; 308) arranged in the passage (4; 204; 304), the valve sealing member (8; 208; 308) together with the plunger (16; 216; 316) being configured to control a fluid flow through the passage (4; 204; 304); a flexible tubing (11; 211; 311) having a distal end (10b; 210b; 310b)fixedly arranged to the housing (1; 201;301), thereby forming a first fixing portion (25; 225;325) of the flexible tubing (11; 211; 311); wherein the plunger (16; 216; 316) having a proximal end (19a; 219a; 319a) being arranged to the flexible tubing (11; 211; 311), thereby forming a second fixing portion (26; 226; 326) of the flexible tubing (11; 211; 311); and a distal end (19b; 219b; 319b) configured to selectively act on the valve sealing member (8; 208; 308) for selectively setting the valve device (100; 200; 300) from an open state or a closed state to a forced open state; a proximal end (19a; 219a; 319a) being arranged to the flexible tubing (11; 211; 311), thereby forming a second fixing portion (26; 226; 326) of the flexible tubing (11; 211; 311); and a distal end (19b; 219b; 319b) configured to selectively act on the valve sealing member (8; 208; 308) for selectively setting the valve device (100; 200; 300) from an open state or a closed state to a forced open state; wherein the valve device (100; 200; 300) allowing a fluid flow in a downstream direction in the open state from the proximal end (2a; 202a; 302a) of the housing (1; 201; 301) to the distal end (2b; 202b; 302b) of the housing (1; 201; 301), and restricting a fluid flow in an upstream direction in the closed state from the distal end (2b; 202b; 302b) of the housing (1; 201; 301) to the proximal end (2a; 202a; 302a) of the housing (1; 201; 301); and wherein the valve device (100; 200; 300) upon being selectively set in the forced open state, a fluid flow in the upstream direction from the distal end (2b; 202b; 302b) of the housing (1; 201; 301) to the proximal end (2a; 202a; 302a) of the housing (1; 201; 301) is allowed; and wherein the valve device (100; 200; 300) is arranged to be selectively set from an open state or closed state to the forced open state by affecting the length of the flexible tubing (11; 211; 311) as seen between its first fixing portion (25; 225; 325) and its second fixing portion (26; 226; 326), thereby displacing the plunger (16; 216; 316) relative the housing (1; 201; 301).