One kind of differential pressure spool

The present invention relates to a differential pressure spool valve comprising a valve body, a spring and a valve sleeve, the valve spool and the condom is provided on the outside of the two springs, the two compression spring disposed between the valve body and the valve sleeve when the air inside; respectively at both ends of the valve sleeve defines a flow inlet orifice, the valve body is opened in the valve body has two flow channels leading to the side wall, two flow channels are not communicated; on the valve housing side wall two positions corresponding to each liquid flow path defines a further flow output aperture; in the vicinity of each side wall adjacent the valve body flow passage further defines a discharge aperture, the liquid flow to the contralateral side through the drain hole a passage communicating with a bleed passage. Slide valve differential pressure provided by the present invention, a hydraulic system suitable for comparison, by using the differential pressure regulating principle, always maintaining a pressure differential in a range of operating two predetermined load, the load in the process will not work in the two load large differences in pressure overload, to ensure that the load is always two to do useful work.