This part of GB/T 7940 specifies the pneumatic five-port directional control valve without electrical connectors. When the maximum operating pressure is 1.6MPa, the installation surface requirements are as follows: ——The overall dimensions and tolerances of the installation surface: ——The identification of the air port : - identification of the control mechanism driving results. This section does not apply to the functional characteristics of the mounting surface.
GB/T 7940.1-2008 Referenced Document
GB/T 10610-1998 Geometrical Product Specifications(GPS)-Surface texture: Profile method--Rules and procedures for the assessment of surface texture
GB/T 17446-1998 Fluid power systems and components--Vocabulary