| 摘要 |
<p>A variable pressure drop proportional motor controlled directional valve comprising a valve body, a bore in the body, and a cylindrical spool slideable in the bore. A force motor is operatively connected to the spool for moving the spool. The body has a pressure inlet port extending to the bore and spaced outlet ports extending to the bore on opposite sides of said pressure port. The spool has an axial passage and generally radial passages such that when the spool is moved, the radial passages will provide communication between the pressure inlet port and one of the outlet ports. A member is adjustably positioned in the spool for varying the orifice area to at least one of the radial passages so that the pressure drop between the axial passage and the radial passage can be adjustably varied.</p> |
