| 摘要 |
The quick opening and closing valve of the present invention has a ball (40) or other type of plunger that moves in a main chamber (10) from a closed position seated on the outlet (28) to an open position spaced from the seat (30) formed where the outlet and chamber meet. A control port (52) extends into the chamber (44) on the other side of the plunger (40) from the outlet (28). The control port (52) is alternatively opened or closed by a control gate (54). The pressure at the outlet is approximately atmospheric, but some fluid flows to the other side of the plunger which elevates the pressure there, urging the plunger against the seat (30). Opening the control port (52) drops pressure on that side of the plunger approximately to atmospheric, whereupon the force of the fluid pushes the plunger (40) away from the seat. |
