| 摘要 |
The valve's passages (22,26) are connected to a sprayer unit, two or more of them passing through a valve (70) with slide (74) guided in a passage (76) to open and shut them. Part of a first passage (26) forms a pressure chamber (88) in the guide passage, pressure in which thrusts the slide from the shut to the open position against spring action (86), this pressure acting against the slide end face (90). A medium inlet (78) in the chamber is permanently open, while an outlet (82) is shut by the slide. In the shut position the distance between the slide end face and the outlet is greater than that between a section (98) of a second passage (22) through the slide and the inlet and/or outlet (80,84) in the guide passage, so that on opening the second passage is opened before the first, while the first passage shuts before the second on shutting. |
