One intermediate sluice valve slide valve is provided and those of plunger directly contacts band medical fluid is placed in syringe, the slide valve for syringes. Slide valve and injector will not influence and not by medical fluid, the medical fluid. Intermediate sluice valve (10) is mounted on the first elastomer that there is injection tube first elastomer (13) an of substantially cylindrical and the second elastomer of generally circular cylindricality to be connected to bottom surface (14) 1 (13c). A kind of synthetic resin film (15) is that the first elastomer (13) for being layered bottom surface (13a) on the other and the slave bottom surface that a part of first elastomer (13) in surface continues to run over there are stretched out. A kind of synthetic resin film (16) is that the second elastomer (14) for being layered bottom surface (14a) on the other and the slave bottom surface that partially continues to run over there of the second elastomer (14) are stretched out. The connection of first elastomer (13) and the second elastomer (14) is to be formed in multiple bottom surfaces by cooperation annular groove (18) and annular ridge (17). When intermediate sluice valve is inserted into injection-tube, the first and second elastic components (13,14) between connector will not contact the injection-tube of inner wall.
