In consequence the invention is based on the object of avoiding the above disadvantages and providing a control valve which has a high closing force with a small actuating force, as well as facilitating a simple and compact construction.

One aspect of the invention involves a control valve having a valve body and a valve seat mounted within the valve body. Hydraulic control valves A valve element is mounted in the valve body and bears in a closed position on the valve seat to block a fluid passage formed in the valve body. An actuating rod is configured for axial movement and acts upon the valve element to move the valve element into an open position. Water Pump Control ValvesAt least one of the actuating rod and the valve element has an annular piston surface and is in communication with a fluid passage through an equalizing line.

The formation of an annular piston surface on the actuating rod and of an equalizing line, which is in communication with the fluid passage, leads to the result that pressure occurring in the fluid line is passed to the rear side of the valve element and there increases the closing force of the valve element by acting on the annular piston surface. A

2011-12-13

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