Internal pilot air supply can bechosen with an operating pressure in the range 1.5 … 8 bar, 2.5 … 8 bar or 3 … 8 bar (depending on the valve used). The pilot air supply is branched from duct 1 (compressed air supply) using an internal connection. The internal pilot air is branched from port 1 in the valve body. The external pilot air (port 12/14) is supplied individually at each valve housing 2x 3/2-way valve, normal position closed, single solenoid: