| 摘要 |
In the feed line (5) in the vicinity of the mouthpiece (11) is a second valve (14) which opens at normal spraying pressure upstream from it, but tends to close when the pressure drops. The three-way manoeuvring valve (9) has two paths (18,19) establishing communication between the pump (3) and the mouthpiece. A third path (20) connects the valve movable body to the part of the line between the valve and the mouthpiece, and is in contact with a pressureless part of the spray fluid tank. On completion of a spraying operation, the manoeuvring valve establishes communication between the part of the feed line between it and the mouthpiece and the third path, after contact between the two first paths of the valve has been cut off. |
