Patent ID: 7926513
Filing Date: 2011-04-19
Classification: F15B,F16K,Y10T

Abstract:
1. A spool valve comprising: a valve housing having a shaft bore, an output port, and a drain port communicated with an exterior; a spool that is slidably supported within the shaft bore in a longitudinal direction, the spool having a first diameter portion and a second diameter portion; an output chamber defined between the valve housing and the spool, wherein the output chamber is communicated with the output port; a feed back chamber defined between the valve housing and the spool; a feed back port defined within the spool for providing communication between the output chamber and the feed back chamber; and radial damper means having: the adjacent chamber serves as a spring chamber, in which a spring is provided for biasing the spool in the longitudinal direction; and the spring chamber is communicated with the drain port.