| 摘要 |
<p>The spool valve for e.g. a hydraulic circuit, has a spool (3) down the centre which slides axially inside a sleeve (2) inside the housing (1). The sleeve has grooves (6, 8, 10) around it communicating through radial holes (5, 7, 13) with the spool chamber and communicating also with a working line (A), the tank (T) and the pump (P) respectively. Movement of the piston connects the latter lines selectively via a chamber (4) near the middle of the spool. The spool also has grooves (12, 19, 20) around it, for sealing rings. The spool has two grooves (12, 19) near the return spring end, and one (20) near the other end, with the chamber (4) between them. There are further sealing rings inset in the sleeve (2) between its chambers.</p> |
