| 摘要 |
Apparatus for cleaning a cooling system having inlet and outlet ports for circulating a cleaning fluid. A cleaning solution is supplied to one port of the cooling system with the other port thereof communicating with a discharge conduit. Positive pressure and a negative pressure are created alternately in the discharge conduit to cause the cleaning solution to flow in opposite directions. One check valve in the discharge conduit permits flow only in response to the creation of positive pressure and another check valve permits flow only in response to the creation of negative pressure. A member restrains opening of said one check valve until there is a predetermined increase in positive pressure and an other member restrains opening of the other check valve until there is a predetermined increase in negative pressure with said another member requiring a greater force to open said other check valve than the force required to open said one check valve whereby there is major flow toward discharge and minor flow in the reverse direction.
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