JB/T 12705-2016Pneumatic silencers (English PDF)

National Standard of the People's Republic of China

ICS

23.100.99

Issued by: Ministry of Industry and Information Technology of the People's Republic of China

Contents

• 1 Scope
• 2 Normative references
• 3 Terms and definitions
• 4 Classification and connecting dimensions
• 4.1 Classification
• 4.2 Connecting dimensions
• 4.3 Graphical symbols
• 5 Technical requirements
• 5.1 Working conditions
• 5.2 Performance requirements
• 6 Test methods
• 6.1 Test conditions
• 6.2 Performance test
• 7 Appearance quality
• 8 Inspection rules
• 8.1 Factory inspection
• 8.2 Type inspection
• 9 Identification, packaging and storage
• 9.1 Identification
• 9.2 Packaging
• 9.3 Storage
• 10 Explanation of the markings
• Annex A (normative) Pressure measuring tube and adaptors
• A.1 Overview
• A.2 Pressure measuring tube
• A.3 Adaptors
• Figure 1 Connecting structure and dimensions of the silencer
• Figure 2 Test circuit of the silencing effect
• Figure 3 Structural diagram of the throttling orifice plate
• Figure 4 Positions of the silencer and of the microphones on the hemispherical or cylindrical measurement surface
• Figure 5 Principle diagram of the mechanical strength test method
• Figure 6 Principle diagram of the durability test
• Figure A.1 Pressure measuring tube
• Figure A.2 Type 1 adaptor
• Figure A.3 Type 2 adaptor
• Table 1 Specifications and models of the silencer
• Table 2 Connecting dimensions of the silencer
• Table 3 Permissible errors of the measuring instruments
• Table 4 Permissible variation range of the controlled parameter values under the specified test conditions
• Table 5 Dimensions of the throttling orifice plate
• Table 6 Load of the mechanical strength test
• Table 7 Minimum volume of the air receiver of the working port
• Table A.1 Typical dimensions of the pressure measuring tube
• Table A.2 Typical dimensions of the type 1 adaptor
• Table A.3 Typical dimensions of the type 2 adaptor