Shut-off valve for a liquid flow line or infusion device

Claim 1

In a shut-off valve apparatus for a fluid flow device of the type having a sleeve-form casing (2) with a lateral opening (4) disposed between end-wise portions of the casing, an elastic flexible tube piece (7) lying within the casing (2) adapted to permit fluid flow therethrough, and a pressure body means (14) movable radially within the lateral opening (4) for selectively compressing the flexible tube piece (7) to stop fluid flow through the flexible tube piece (7), the improvement comprising, in combination, a guide sleeve (8) surrounding the lateral opening (4) and extending radially outwardly from the casing (2), the guide sleeve comprising at least one pair of blocking stop members (10, 10', 11, 11'), the pressure body carrying an elastic mantle (12) having a snap ring (18) depending therefrom, said snap ring (18) being engageable with at least one pair of the blocking stop members during the compression, the pressure body (14) comprising a cap (16) from which the mantle and snap ring (18) depend, the pressure body (14), cap (16), mantle (12) and snap ring (18) comprising an integral plastic structure, two pairs of blocking stops (10, 10', 11, 11') being provided which depend radially outwardly from the outside of the guide sleeve (8), each stop in a pair lying diametrically opposite from the other stop in the pair and each stop in a pair lying at the same axial distance from the casing (2) along the sleeve (8) as the other stop in the pair, wherein each pair of the blocking stops is disposed at a different height than the other pair along the sleeve (8) in the axial dimension of the sleeve (8) and wherein each pair is angularly offset with respect to the other pair in the radial direction of the sleeve (8).