| 20110240897 | Pressure Limiting And Suction Valve Unit - A pressure limiting and suction valve unit includes a valve closing body including a valve closing face, which, together with a first valve seat lying opposite the valve closing face, forms a first sealing seat for sealing off a first pressure region from a second pressure region, a second valve seat defining a valve closing body orifice, the valve closing body orifice, together with a closing head formed on an axially movable valve pin, forms a second sealing seat for sealing off the second pressure region from the first pressure region, a spring plate connected to the valve pin and movable axially together with the valve pin, a first closing spring which is tension-mounted between the spring plate and the valve closing body and prestresses the valve pin against the second valve seat formed on the valve closing body, and a second closing spring which prestresses a valve subassembly against the first valve seat, wherein the valve pin is guided sealingly in at least one first guide portion formed in the valve closing body, wherein the second valve seat and the first guide portion are configured to be arranged on different sides of the second pressure region with respect to the direction of movement of the valve pin, wherein the first guide portion is configured to separate a volume connected to the first pressure region from one of the second pressure region and a volume connected to the second pressure region, and wherein a cross-sectional area of the first guide portion is configured to define a surface of a valve pin, said surface being acted upon by the pressure of the second pressure region, is smaller than a cross-sectional area of the second valve seat. | 10-06-2011 |
