can be acted upon with a control pressure for this in accordance with fig5 a control pressure pump 36 can be provided which is connected in a suitable manner to the control pressure connection 35 and which is connected on the suction side for example again to the environment 34 to actuate the pump 36 a control device 37 can be provided by means of which the control pressure p 3 is able to be set for this the control device 37 receives input signals on the input side via corresponding control lines depending on which input signals it actuates the pump 36 for example the control device 37 can be connected to a pressure sensor 38 which detects the pressure on the raw side in this way the control pressure i e the pressure in the control chamber 23 can be set as a function of the pressure on the raw side the control pressure can be produced here pneumatically or hydraulically in the embodiments of fig2 3 and 5 7 in which the cylinder 32 is formed integrally in the filter housing 3 the cylinder 32 is closed on a side facing away from or at a distance from the valve member 10 by means of a closure 39 which for this can for example be screwed into the filter housing 3 a seal.