| 摘要 |
<p>A multi-position (e.g. three way) valve (30) is operatively connected to a combined vacuum/holding tank (12) for a vacuum toilet system (10), and to a pump (24) capable of pumping both air and sewage. When the valve is in one position air is pulled from the tank through the pump to increase the vacuum level in the tank, e.g. to above 10 in/Hg. When the valve is moved to a second position by either a float or manual switch (39; 38) operation, the sewage is pumped out of the tank through the pump while surrounding air moves through the valve into the tank. <IMAGE></p> |
