Pressure safety block for high pressure cleaning apparatus

摘要

In a hole of the control device between suction and pressure side of the high pressure pump a changeover valve is fitted, which when a specific pre-set pressure is exceeded causes a feedback of at least one part of the cleaning medium activated by high pressure to the suction conduit of the high pressure pump. The regulating unit (2) has at least two component parts with proportional characteristic values for pressure regulation. At least one switch unit for pressure-dependent temperature regulation of the cleaning medium is so arranged with at least one switch position along a displaceably arranged axis so that at least one switch arm reaches as far as the corresponding switch mechanism in order to operate it. The regulating component parts are formed as springs (33,35) with proportional spring constants.