| 摘要 |
A line marking apparatus includes a closed circuit circulation system for line marking material. The circulation system comprises a pump (17) for circulating line marking material under pressure through the circuit from an outlet of the pump back to an inlet thereof. The circulation system also comprises an inlet (15) for introducing fresh line marking material to the circuit when required, the inlet being positioned upstream of the inlet of the pump. The circulation system further comprises means (19, 25) for controlling the pressure of line marking material downstream of the outlet of the pump. The circulation system moreover comprises an outlet for conducting pressurized line marking material to a spray nozzle (21) for marking a line (23) with the line marking material when the fluid pressure in the circulation system exceeds a threshold. |
