| 摘要 |
A non-return valve with an integrated pressure-regulating piston, which has a free passage with a non-return valve function in one direction of flow, has in a valve slide acting as a non-return valve a pilot-controlled pressure-regulating piston 5 which is effective in the other direction of flow. The non-return valve action is effective in the direction of flow from connection 2 to connection 3 while the pilot-controlled pressure-regulating piston 5 is effective in the direction of flow from connection 3 to 2. Mounted in a housing 1 with a bore 27 and 28 is a valve slide 4 which has a shoulder 29 that controls the two annular notches 24 and 25. In the appropriate position, the spring space 61 of the pressure-regulating piston 5 mounted in the bore 31 of the valve slide 4 is connected via hole 60, pressure space 59, radial holes 30, annular notch 24 and connecting hole 20 to control connection 21 and the piston can be controlled by means of a pressure-regulating valve. The compression spring 10 presses the valve slide 4 against the seat edge 33, the annular surface formed by hole 27 and 28 displacing the valve slide 4 counter to the compression spring 10 during the non-return valve action. The pressure-regulating piston 5 is pressed onto the conical seat 35 by the compression spring 7 and opened in a known manner by pilot-controlled pressure valves as soon as a pressure difference arises between the pressure space at the conical seat 35 and the spring space 61, i.e. as soon as a flow of control oil ... Original abstract incomplete. <IMAGE>
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