The valve system consists of a body and factory installed armature system with a loss-proof or insertable O-ring or molded seal. The market establishment of pneumatic interfaces leads to different types of valve bodies and pneumatic interface standards. Comite de Moyens de Production (CNOMO) is the Normalization of the following batch of standards used in industrial pneumatics, originating in the French automobile industry.

SF (side flange)

KR (concentric O-ring)

GKR (concentric O-ring with captured exhaust gas)

FL (lower flange connection with O-ring)

CNOMO (Interchangeable series with established pneumatic connection hole pattern)