| 摘要 |
An electromagnetic hydraulic valve ( 1 ), which including an electromagnet ( 2 ) with an armature ( 3 ) and of a valve housing ( 4 ) with an axial bore ( 5 ) and a piston valve ( 6 ) located therein is provided. The valve housing ( 4 ) includes several annular grooves ( 8, 9, 10 ) in which several radial openings ( 11, 12, 13 ) are located, which open into the axial bore ( 5 ), through which the hydraulic valve ( 1 ) has a fluid connection with a pressure connection (P), a tank connection (T) and two consumer connections (A, B). The piston valve ( 6 ) is acted upon by the armature ( 3 ) of electromagnet ( 2 ) and includes two ring-shaped control sections ( 14, 15 ), which connect alternatively the pressure connection (P) and the tank connection (T) with one of the consumer connections (A, B) through axial movement of piston valve ( 6 ). According to the invention, the radial openings ( 11, 12, 13 ) in valve housing ( 4 ) are provided as windows having a rectangular cross section. The cross section surface, released from the control sections ( 14, 15 ) of piston valve ( 6 ) form circular segments and can be changed in such a way that that flow through radial openings ( 11, 12, 13 ) in all of the positions of piston valve ( 6 ) is linear to each position of the armature ( 3 ) of the electromagnet ( 2 ).
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