| 摘要 |
<p>A carpet cleaning system that delivers heated cleaning water from a truck to a carpet cleaning apparatus and an improved waste disposal tank designed to receive the waste water and deposit it into the toilet or sewer drain when t he disposal tank is full. The disposal tank is divided into an upper primary recovery tank and a lower recovery tank. A main vacuum line and waste water return li ne are connected to the primary recovery tank. Disposed between the primary and secondary recovery tanks is a first check valve that controls the flow of waste water therebetween. Connected over the outlet port on the secondary recovery tank is a second check valve that operates in opposite direction to the first che ck valve. Attached to the secondary recovery tank is an air control valve that control s the flow of air from the primary recovery tank or the outside air into the secondary recovery tank. A timer or a float valve is connected to the air control valv e to selectively control its operation. When the air control valve is inactivated , the air pressures in the tanks are equal and sub-atmospheric. When the air control valve is activated, the flow of air between the tanks is discontinued and outside air is able to flow into the secondary recovery tank. When outside air enters the secondary recovery tank, the first check valve closes to maintain vacuum pressure insi de the primary recovery tank for cleaning, and the second check valve opens to allo w discharge of the waste water from the secondary recovery tank.</p> |
