HG/T 2178-2019 Rubber diaphragms and rubber parts for diaphragm gas meters
Rubber diaphragms and rubber parts for diaphragm gas meters
1 Scope
This standard specifies technical requirements such as use performance and material properties of, as well as test methods, inspection rules, markings, packaging, transportation and storage of rubber diaphragms and rubber parts for diaphragm gas meters, etc., and defines relevant terms and classifications.
This standard is applicable to rubber diaphragms and rubber parts used in diaphragm gas meters for measuring artificial gas, natural gas and liquefied petroleum gas.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 528-2009 Rubber, vulcanized or thermoplastic - Determination of tensile stress-strain properties
GB/T 1690 Rubber, vulcanized or thermoplastic - Determination of the effect of liquids
GB/T 3512 Rubber, vulcanized or thermoplastic - Accelerated ageing and heat resistance tests - Air-oven method
GB/T 5721 General rules of identification, packaging, transportation and storage for rubber sealing product
GB/T 6031-2017 Rubber, vulcanized or thermoplastic Determination of hardness(hardness between 10 IRHD and 100 IRHD)
GB/T 7759.1-2015 Rubber, vulcanized or thermoplastic - Determination of compression set - Part 1: At ambient or elevated temperatures
GB/T 7759.2-2014 Rubber, vulcanized or thermoplastic - Determination of compression set - Part 2: At low temperatures
GB/T 7762 Rubber, vulcanized or thermoplastic - Resistance to ozone cracking - Static strain test
HG/T 3867 Vulcanized rubber - Determination of coefficient of low temperature resistance at extension
SH 0004-1990 Solvent oil for rubber industry
ISO 3210 Rubber-or plastics-coated fabrics - Physical and mechanical tests - Determination of flex resistance by the flexo-meter method
3 Terms and definitions
For the purposes of this document, the following term and definition apply.
3.1
rubber diaphragm
flexible gas-tight membrane element which is molded from double-sided coated fabric and placed in the metering chamber of a diaphragm gas meter for measuring gas flow
4 Classification
4.1 Rubber diaphragms and rubber parts are classified by contact air source:
Category 1: Artificial gas;
Category 2: Natural gas or LPG.
4.2 Rubber diaphragms and rubber parts are classified by working temperature range:
Ordinary type (Type N): -10°C~+40°C;
Wide-temperature type (Type W): -25°C~+55°C.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Requirements
6 Inspection rules
7 Marking
8 Packaging, transportation and storage
Annex A (Normative) Test method for softness of rubber diaphragms
