<p>The valve is fitted between two parts movable relative to each other. One part includes a valve casing, inside which moves a valve body with a sealing surface in which a through passage comes out. The other part has a valve seat with a seating surface and a valve channel coming out in this surface. At least in a region of one part which is against the through passage (23) in the movement direction, the sealing surface (25) is of greater measurement than the dia. of the valve channel (31). The valve (1) has a scraper (11). The through passage in the valve body (17) may be in the form of a jet.</p>
