| 摘要 |
<p>An air valve, for controlling feedback air in spray guns, comprising a valve body (10) and valve member (9), a spindle (6) slidably sealed through valve body (10) and valve member (9), spindle (6) having a shoulder (7) closing a first seating (8) in valve member (9), the rear of spindle (6) slidable in a shuttle (15) which also slides in a fixed valve spool (12) having a second seating (12a) closed by the rear of shuttle (15). Two ports (22, 23) are provided one either side of second seating (12a) between spool (12) and shuttle (15) for feedback air past the valve and two ports (24, 25) provided either side of first seating (18) between valve member (9) and spindle shoulder (7) for main air through the valve, so that operation of spindle (6) opens the first valve prior to the second valve and closes the second valve prior to the first valve.</p> |
