Control valve with a measuring chamber

A control valve comprising a valve housing comprising with an inlet for connection with a fluid source;

• and an outlet for connection with a fluid recipient, a fluid path extending from the inlet to the outlet, an adjustable first valve body at the fluid path for adjusting a first flow opening of the fluid path, a first channel debouching into the fluid path at a first location on a stream-wise first side of the first flow opening and a second channel debouching into the fluid path at a second location on a stream-wise opposite side of the first flow opening, and at least a first measuring chamber, the control valve further comprising a second valve body movable between a first position and a second position whereby in the first position the second valve body provides fluid communication between the first channel and the first measuring chamber, and in the second position the second valve body provides fluid communication between the second channel and the first measuring chamber;
• wherein an adjustable third valve body is provided at the fluid path for adjusting a second flow opening of the fluid path at a flow-wise different location than the first flow opening;
• and
• wherein one of the first valve body and the third valve body is a pressure maintaining valve body adapted to maintain a constant pressure difference over the other of the first valve body and the third valve body, said other of the first valve body and the third valve body being a flow adjusting valve body, wherein one of the first location and the second location is placed between the first flow opening and the second flow opening, wherein a third channel debouches into the fluid path at a third location on a flow-wise different side of the first and the second flow opening than the first and the second location, said third channel being in fluid communication with a second measuring chamber, and wherein the second of the first location and the second location is placed on a stream-wise opposite side of said pressure maintaining valve body relative to said one of the first location and the second location, and the third location is placed on a stream-wise opposite side of the flow adjusting valve body relative to said one of the first location and the second location.