Importance

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Abstract

In a high-pressure cleaner of the type comprising a) a high-pressure pump (3), b) a motor driving said pump (3), c) a liquid supply (1,2) connected to the suction side (8) of the pump (3), d) a cleaning gun (4) connected to the delivery side (6) of the pump (3) through a delivery duct (10) and comprising a manually operable stop valve, and e) a bypass valve (16,17) adapted to in its open condition to allow flow frem the delivery side (6) to the suction side (8) of the pump (3), the main novel feature is f) flow-sensing mechanism (15,20) associated with the delivery duct (10) and adapted to open the bypass valve (16,17) when flow in the delivery duct ceases or decreases below a predetermined magnitude and to act upon it in the closing direction when flow is equal to or above the predetermined magnitude. With this arrangement, it is possible to utilize the positional change of the bypass valve member (16) for other purposes, such as switching-off the motor (not shown) for the pump (3) by a mechanism means of a normally closed switch (12) operated through a motion-delaying mechanism, such as a spring (35) in combination with a dashpot arrangement (27,36,37,13).

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First Claim