A channel block for a chemical liquid dosing apparatus having an upper surface and a bottom surface opposite to said upper surface, a front surface, and a rear surface opposite to said front surface, wherein said front surface is orthogonal to said upper surface, said channel block comprising: a process outlet positioned to allow discharge of a chemical liquid from said channel block travelling towards a delivery point of said chemical liquid; a chemical liquid inlet configured to receive said chemical liquid travelling into said channel block; an evacuation outlet positioned for evacuating excess chemical liquid in channels of said channel block; channels provided within said channel block that connect at least said process outlet, said chemical liquid inlet and said evacuation outlet; a pressure indicator mounted to said channel block to measure pressure of said chemical liquid entering through said chemical liquid inlet; an evacuation regulation valve mounted to said channel block upstream of said evacuation outlet, and interacting with said channels to control passage of said chemical liquid through a channel of said channels connecting said chemical liquid inlet to said evacuation outlet; and at least one control valve (51, 52, 53) mounted to said block configured to control said chemical liquid passing through said channels, wherein a first control valve of said at least one control valve (51, 52, 53) is situated with respect to said channels to control flow of said chemical liquid to said process outlet, wherein said evacuation regulation valve is positioned with respect to the at least one control valve such that a pressure set point of said evacuation regulation valve may be adjusted using said pressure indicator when said at least one control valve is in a closed position. a process outlet positioned to allow discharge of a chemical liquid from said channel block travelling towards a delivery point of said chemical liquid; a chemical liquid inlet configured to receive said chemical liquid travelling into said channel block; an evacuation outlet positioned for evacuating excess chemical liquid in channels of said channel block; channels provided within said channel block that connect at least said process outlet, said chemical liquid inlet and said evacuation outlet; a pressure indicator mounted to said channel block to measure pressure of said chemical liquid entering through said chemical liquid inlet; an evacuation regulation valve mounted to said channel block upstream of said evacuation outlet, and interacting with said channels to control passage of said chemical liquid through a channel of said channels connecting said chemical liquid inlet to said evacuation outlet; and at least one control valve (51, 52, 53) mounted to said block configured to control said chemical liquid passing through said channels, wherein a first control valve of said at least one control valve (51, 52, 53) is situated with respect to said channels to control flow of said chemical liquid to said process outlet, wherein said evacuation regulation valve is positioned with respect to the at least one control valve such that a pressure set point of said evacuation regulation valve may be adjusted using said pressure indicator when said at least one control valve is in a closed position.