Disk valve

Disk valve for fluid under pressure, comprising:

• a) a housing with an inlet and an outlet;
• b) a fixed first control disk mounted inside the housing and having a first fluid control port;
• c) a second control disk which can be rotated about an axis, also mounted inside the housing and which rests on the first control disk and has a second fluid control port which is not concentric to the axis, the second control disk being continuously adjustable between an open position in which the second fluid control port is in alignment with the first fluid control port and a closed position in which the second fluid control port is not aligned with the first fluid control port;
• d) a concentric pressure relief surface associated to the second control disk, which is in contact with an outlet pressure of the fluid, at least when the second control disk is in the closed position;
• e) a recess provided in the surface of the first control disk to be facing the second control disk, so that the recess forms a pressure contact surface on an underside of the second control disk, the pressure contact surface being in contact with the outlet pressure of the fluid in its closed position, its open position, and intermediate positions, the choice of position and size of the recess being such that in the closed position of the second control disk, a tilting moment caused by fluid pressure acting on an underside of the second control disk by the first fluid control port in the fixed control disk is at least virtually cancelled out by a tilting moment acting in an opposite direction due to the presence of the recess.