This standard specifies the general requirements, performance requirements, test methods, inspection rules and product identification for pneumatic fluid power directional control valve with pressure no greater than 1.6MPa.
This standard is applicable to general-purpose pneumatic fluid power directional control valves with compressed air as the working medium, including solenoid, pneumatically, mechanically and manually controlled directional control valves.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this standard. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 156 Standard Voltage (GB/T 156-2007, IEC 60038: 2002, MOD)
GB/T 786.1 Fluid Power Systems and Components - Graphic Symbols and Circuit Diagrams - Part 1: Graphic Symbols (GB/T 786.1-1993, eqv ISO 1219-1: 1991)
GB/T 2346 Fluid Power Systems and Components - Nominal Pressures (GB/T 2346-2003, ISO 2944: 2000, MOD)
GB/T 4026 Basic and Safety Principles for Man-machine Interface, Marking and Identification - Identification of Equipment Terminals and Conductor Terminations of Certain Designated Conductors, Including General Rules for an Alphanumeric System (GB/T 4026-2004, idt IEC 60445: 1999)
GB/T 14038 Pneumatic Fluid Power - Connections - Ports and Stud Ends (GB/T 14038-2008, ISO 16030: 2001, IDT)
GB/T 14513 Pneumatic Fluid Power - Determination of Flowrate Characteristics of Pneumatic Components
GB/T 17446 Fluid Power Systems and Components - Vocabulary (GB/T 17446-1998, idt ISO 5598: 1985)
GB/T 22107 Pneumatic Fluid Power - Directional Control Valves - Measurement of Shifting Time (GB/T 22107-2008, ISO 12238: 2001, IDT)
JB/T 5967 Classification of Air-operating Gas Quality Applicable to Pneumatic Components and Systems
ISO 11727 Pneumatic Fluid Power - Identification of Ports and Control Mechanisms of Control Valves and Other Components
3 Terms and Definitions
For the purposes of this standard, the terms and definitions specified in GB/T 17446 and those listed below apply.
3.1
manipulating force
the force applied on the control device which enables manually or mechanically controlled directional control valve to work normally
3.2
elastomeric seal
the seal form that uses elastomeric seals to realize the sealing requirements
3.3
clearance seal
the seal form that uses micro clearance between kinematic pair to achieve sealing function
3.4
working frequency
the reciprocal of interval between two switching actions of pneumatic fluid power directional control valve under operating conditions, expressed in once/time
3.5
power-frequency withstand voltage
the power-frequency sinusoidal voltage (rms) not causing breakdown under specified test conditions (power frequency is 50Hz in China)
3.6
ripple coefficient
the ratio of the AC component (rms) in the rectified voltage to the average value of the rectified voltage
