| 摘要 |
<p>Solenoid valves for providing either of two desired fluid flow rates, comprising two coaxial armatures, are known. In the present valve, the lower armature (22) has a sealing ring (18) which seals against an outlet passage rim (50), and has an internal bore (36, 38, 40) with an upper rim (44). The upper armature (24) has a sealing member (58) which seals against rim (44). Figure 1 shows the valve in the closed position. For a low flow rate, the upper armature (24) is raised by energizing coil (74), to allow fluid flow up grooves (37) in the lower armature and through the bore therein. For a high flow rate, the lower armature (22) is also raised by energizing coil (72), so sealing off the bore passage but opening the flow path direct from chamber (12) to outlet passage (14).</p> |
