Marine Working Logic Working logic is the name of a high-performance, service-proven program of ND 4 logic valves. It combines the advantages of traditional pneumatic valves (large capacity) and logic elements (logic circuits). Features: Space-saving and simple installation One valve program with identical port pattern, designed to be mounted on subplates Simple, inexpensive assembly of complete control units Excellent life expectancy due to a minimum of lightweight moving parts Simplified maintenance by easy replacement of complete components, a positioning pin preventing mounting errors Some components: Pneumatic logic unit for the control of logic functions All working logic valves have a base of 41 x 41 mm with identical port pattern. They are mounted on subplates by means of 2 hexagone socket screws. Up to 4 working logic components can be mounted on one subplate. Subplates form logic units which are mounted on fastening borders one next to the other. 3/2-way-valve type 372-250-022-0 for the ventilation or exhaust of the control line Copper pipes or plastic tubes can be used to interconnect the components. Indicating pins facilitate function tests and trouble shooting with e. g. 3/2-way- and solenoid valves. Time control valve type 371-209-250-0 for the decelerated switching of subsequent control components Furthermore there are special distributors/connectors with indicating pins, pressure switches and pressure gauges as well as electric switches for signaling lamps. A subplate to mount single components is available as an alternative to subplates which carry 4 devices.