<p>The valve has a setting system (3) in the valve housing (1) so that the valve seat (2), during adjustment by movement through a sleeve (5) attached to the housing, can also be positioned in an angular zone ( alpha ) so that the valve seat lies flat against the sealing surface (4a) when in the closed position. The setting unit (3) is a piezoelectric bending element. After adjustment, the valve seat (2) is fixed in relation to the housing.</p>
