| 摘要 |
A pressure regulating valve, in particular a proportional pressure regulating valve, includes a valve body ( 1 ) with at least a pump connection (P), a use connection (A) and a tank connection (T). A piston ( 19 ), capable of being displaced by a controllable actuating device ( 29 ), is guided in the valve body ( 1 ). At the periphery of the piston, a recess ( 45 ) is formed and defines a peripheral annular gap ( 47 ) delimited by the control edges ( 49, 51 ) of the piston ( 19 ). In the piston ( 19 ), a passage ( 55 ) provides fluid communication between the front surface of the piston ( 19 ), subjected to the use connection (A) pressure, and the rear surface ( 35 ) of the piston ( 19 ), adjacent to a pressure chamber ( 37 ) located behind. The passage ( 55 ) of the piston ( 19 ) has, in the region proximate to the piston front surface, a restriction zone ( 57 ). In a region away from the restriction zone ( 57 ) towards the rear of the piston surface ( 35 ), an orifice ( 59 ) faces the peripheral annular gap ( 47 ), and has a second restriction zone ( 61 ).
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