| 摘要 |
<p>The outer cylindrical container (12) contains a flexible container (8) for air or other gas, which is pressurised and fed up through a tube (9) to the spray nozzle (7). The valve (2) controlled by a button (2a) to close off both the air tube and that leading down to the spray liquid. The loss of pressure as the spray is used is compensated by a spring (14) pressing up the base of the flexible air container. Alternatively a thumb-screw operated piston can compress the flexible container.</p> |
