| 摘要 |
<p>The present invention relates to a pilot control valve, especially for use in mining hydraulics. The valve has a valve insert constructed as a valve cartridge, whose single or multipart valve housing has an input entry 17 for pressure fluid P, a connection opening 18 for a load connection A, an output opening 19, opening into the return flow T and an axial boring 21 to accept a valve closing body 20 provided with a closing surface, which can be lifted from a valve sealing seat 31 arranged between the entry opening 17 and the connection opening 18 by means of an electro-magnetic or piezo-electric switching device which can be fastened onto the valve housing. With the lifting movement of the valve closing body 20 from the valve sealing seat 31 is coupled an at least two part closing mechanism for their separation arranged between the connection opening 18 and the output opening 19. In accordance with the present invention a single part valve closing body 20 is provided, having the sealing surface in the form of a collar 28 and the moving part of the closing mechanism in the form of a shaft section 22, whereby the shaft section 22 enters into a boring section 21 C of the axial boring 21 during the lifting movement, closing a radial opening 39. The valve sealing seat 31 can be exchanged with a valve sleeve 130 and the nominal bore of the pilot control valve can be changed by means of a throttle 47.</p> |
