Patent ID: 8171951

Claim:
A valve with an AND function in the case of which a valve member able to be shifted in relation to a valve housing controls the fluid connection between two inlets and an outlet, the switching position of the valve member being dependent on the pressure difference between the fluid pressure obtaining at the two inlets so that at equal input pressures at least one inlet is joined with the outlet, the valve member being able to assume two opposite terminal positions in which it respectively clears one of two first passages and simultaneously shuts off the other first passage, said first passages being connected with the outlet and being stationary in relation to the valve housing, wherein two second passages, connected with respectively one of the two inlets, are present which are respectively a component of one of two passage members able to move in relation to the valve housing in the actuating direction of the valve member, such passage members being so biased by stressing means independently of one another in a yielding manner into a home position that the valve member prior to reaching its terminal positions can bear, dependent on its actuation direction, on the one or the other passage member and thereby can close the second passage thereof so that the associated inlet is separated from the outlet, the level of the stressing force defining a threshold value for the inlet pressure difference and on exceeding said threshold value the valve member being able to force back the passage member, which is stressed and closed by the valve member, in order to shift itself into one of the terminal positions and accordingly to separate both inlets from the outlet.