| 主权项 |
1. method for washing an article in a dry cleaning system employing a cleaning solution, said cleaning solution comprising a liquid and a vapor, said method comprising:
washing in a wash tank an article to be washed with said cleaning solution at hyperatmospheric pressure; storing said cleaning solution in a central storage tank, wherein said central storage tank is closeably connected to said wash tank; transferring said cleaning solution by a single fluid displacement device being a pumping and compressing unit connected through a wash tank-pump line to said wash tank for transfer of cleaning solution from the wash tank to the fluid displacement device and through a further line (108) for transfer of liquid from the fluid displacement device to the wash tank; the wash-tank line and the further line each closeable by a respective valve (26; 28); wherein the method comprises the steps of: operating said fluid displacement device for transferring of said cleaning solution in liquid form in said dry cleaning system; operating said same fluid displacement device for depressurizing said wash tank, after removal of the liquid cleaning solution from the wash tank to the central storage tank, by removing the vapor from the wash tank by means of compressing the removed vapor, wherein the fluid displacement device is a positive-displacement device, being a reciprocating pump/compressor device or a piston device to pressurize fluid, arranged for transferring liquid and vapor fluid, and for compressing vapor fluid. |
