A sleeve (10, 11) for use in a pinch valve, the sleeve (10, 11) comprising: a resilient and at least substantially tubular element (12, 13) having opposite ends and capable of being compressed for reducing or restricting a flow therethrough; a pair of annular end flanges (14, 15), each annular end flange (14, 15) being mounted on each of the opposite ends and extending radially outwardly from the tubular element (12, 13) for sealingly engaging a valve rim; a pair of annular grooves (16, 17), each of the annular grooves (16, 17) being defined between the annular end flange (14, 15) and an annular projection (18, 19), the annular projection (18, 19) extending radially outwardly from the tubular element (12, 13), and a pair of annular railings (20, 21) inserted within the annular grooves (16, 17), the annular railings (20, 21) being dimensioned for receiving a valve flange for retaining engagement therewith and comprising an annular railing wall and a railing base (22, 23), wherein the railing base (22, 23) having an innermost diameter (24, 25) and an outermost diameter (26, 27), the outermost diameter (26, 27) of the railing base (22, 23) being greater than an outermost diameter of a section (32, 33) of the tubular element (12, 13) adjacent to the annular projection (18, 19), wherein the innermost diameter (24, 25) and the outermost diameter (26, 27) of the railing base (22, 23) are greater than the outermost diameter of the section (32, 33) of the tubular element (12, 13) adjacent to the annular projection (18, 19), characterized in that the annular projection further comprises an annular lip member extending radially outwardly from the annular projection for sealingly engaging the valve rim. a resilient and at least substantially tubular element (12, 13) having opposite ends and capable of being compressed for reducing or restricting a flow therethrough; a pair of annular end flanges (14, 15), each annular end flange (14, 15) being mounted on each of the opposite ends and extending radially outwardly from the tubular element (12, 13) for sealingly engaging a valve rim; a pair of annular grooves (16, 17), each of the annular grooves (16, 17) being defined between the annular end flange (14, 15) and an annular projection (18, 19), the annular projection (18, 19) extending radially outwardly from the tubular element (12, 13), and a pair of annular railings (20, 21) inserted within the annular grooves (16, 17), the annular railings (20, 21) being dimensioned for receiving a valve flange for retaining engagement therewith and comprising an annular railing wall and a railing base (22, 23), wherein the railing base (22, 23) having an innermost diameter (24, 25) and an outermost diameter (26, 27), the outermost diameter (26, 27) of the railing base (22, 23) being greater than an outermost diameter of a section (32, 33) of the tubular element (12, 13) adjacent to the annular projection (18, 19), wherein the innermost diameter (24, 25) and the outermost diameter (26, 27) of the railing base (22, 23) are greater than the outermost diameter of the section (32, 33) of the tubular element (12, 13) adjacent to the annular projection (18, 19), characterized in that the annular projection further comprises an annular lip member extending radially outwardly from the annular projection for sealingly engaging the valve rim.