Cemented carbide plate and method of manufacture.

A valve unit (101) for regulating a flow of urine, so that said valve unit comprising an inlet portion (102) and an outlet portion (103) separated from each other by a slide valve (104) , so that said slide valve comprising a female part (105) in direct communication with the inlet portion and the outlet portion and a male part (106) which is axially displaceable in parallel with the female part and is in sealed contact or test liquid with it, so that said male part being configured for assuming two positions, a closed position and an open position, so that, in the closed position, a portion of the male part it is situated outside the female part; in which, in the closed position and in the area where the inlet portion and the outlet portion are joined to the female part, the outer faces of the male part provide a proof locking liquid between the inlet and the exit; and wherein, in the open position, the male part allows liquid passage between said inlet portion and said outlet portion by means of a communication part (112); characterized in that said female part is a tubular member open at both ends and having a tubular wall extending along the entire length of said male part in said open position, to prevent displacement of said male part into said closed position.