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CJ/T 393-2012: Cock assembly for domestic gas appliance Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsCJ/T 393-2012: Cock assembly for domestic gas appliance---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/CJT393-2012CJ INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 91.140 P45 Replacing CJ/T 3072-1998 Cock assembly for domestic gas appliance Issued on: FEBRUARY 9, 2012 Implemented on: AUGUST 1, 2012 Issued by. Ministry of Housing and Urban-Rural Development Table of ContentsForeword ... 3 1 Scope ... 6 2 Normative references ... 6 3 Terms and definitions ... 7 4 Classification ... 11 5 Requirements ... 11 6 Test methods ... 22 7 Inspection rules ... 32 8 Marks and instructions for use ... 33 9 Packaging, transport and storage ... 33 Annex A ... 35 Annex B ... 36 Annex C ... 38 Annex D ... 41ForewordThis Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard replaces CJ/T 3072-1998 Cock assembly for domestic gas appliance. This Standard is the revision to CJ/T 3072-1998 Cock assembly for domestic gas appliance. Compared with CJ/T 3072-1998, the main technical differences are as follows. - Added the maximum working pressure and nominal size applicable to this Standard (see 1); - Added application range of temperature (see 5.6.1); - Added requirements for gas connection (see 5.4 of this edition; 5.3.6 of 1998 edition); - Modified classification method (see Clause 4 of this edition; Clause 4 of 1998 edition); - Modified airtight pressure and leakage values (see 5.6.2 of this edition; 5.2.1 of 1998 edition); - Modified flow test content (see 5.6.4 of this edition; 5.2.2 of 1998 edition); - Modified requirements for operating characteristics (see 5.6.6 of this edition; 5.2.3 and 5.2.4 of 1998 edition); - Modified requirements for additional functions (see 5.6.7 of this edition; 5.2.8~5.2.11 of 1998 edition); - Deleted content of resistance to vibration (see 5.2.12 of 1998 edition); - Deleted content about nozzle in structure (see 5.3.10~5.3.12 of 1998 edition). This Standard uses redrafting method to modify and adopt EN 1106.2010 Manually operated taps for gas burning appliances. Compared with EN 1106.2010, this Standard made more modifications in structure. Annex A listed out the comparison in serial number. Considering Chinese national conditions, this Standard made some modifications to EN 1106.2010. Annex B gives out the technical changes and reasons for reference. Cock assembly for domestic gas appliance1 ScopeThis Standard specifies terms and definitions, classification, requirements, test methods, inspection rules, marks and instructions for use, packaging, transport and storage of cock assembly for domestic gas appliance (hereafter abbreviated as cock assembly). This Standard is applicable to cock assembly used for urban gas appliance stipulated in GB/T 13611, of which the maximum working pressure is less than 10 kPa, nominal size is not greater than DN25.2 Normative referencesThe 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 191-2008 Packaging - Pictorial Marking for Handling of Goods (ISO 780.1997, MOD) GB/T 3091 Welded Steel Tubes for Low Pressure Liquid Delivery GB/T 7306 (All parts) Tube threads with 55 degree thread angle where pressure-tight joints are made on the threads (ISO 7-1.1994) GB/T 7307 Food safety management system - Requirements for quick frozen fruits and vegetable product establishments (GB/T 7307-2001, eqv ISO 228-1.1994) GB/T 8733 Aluminum alloy ingots for casting GB/T 9114 Hubbed screwed steel tube flanges GB/T 9144 General purpose metric screw threads - Preferable plan (GB/T 9114-2003, ISO 262.1998, MOD) GB/T 13611 Classification and essential property of city gas GB 14536.1-2008 Automatic electrical controls for household and similar use [IEC 60730-1.2003 (Ed3.1), IDT] GB 15092.1 Switches for appliances - Part 1. General requirements GB/T 15530 (All parts) Copper alloy welding neck flanges GB 16470 Palletized unit loads GB/T 16411-2008 Universal test methods of gas burning appliances for domestic use GB/T 17241 (All parts) Hubbed threaded cast iron tube flanges CJ 30 Thermocouple electromagnetic protector of extinguishment for gas appliance CJ/T 222-2006 Quality assessment procedures and test rules for gas- burning appliances for domestic use3 Terms and definitionsFor the purposes of this document, the following terms and definitions apply. 3.1 cock assembly for domestic gas appliance An integral control device which takes manual adjustable cock with off-function as main body, equipped with corresponding additional device in accordance with applicable special function requirements for domestic gas appliance. Schematic diagrams of common components on cock assembly are shown in Figure 1 ~ Figure 3. 3.2 additional device device that meets special function of domestic gas appliance, including piezoelectric igniter, micro switch, thermoelectric flameout protection device, mechanical thermostat, etc. 3.3 mechanical thermostat a temperature control device of which the temperature is adjusted by temperature sensor so as to make temperature remained in specified range, including temperature-setting adjustable type and temperature-setting fixed type. 3.4 closure member movable part to cut off gas flow in cock assembly.4 Classification4.1 Classify in accordance with number of operations Classify according to predictable number of operations within period of use of gas appliance. - 5000 times (e.g. cock assembly for outdoor gas appliance); - 10000 times (e.g. cock assembly for small heating stove); - 40000 times (e.g. cock assembly for domestic gas appliance). 4.2 Classify in accordance with bending stress In accordance with bending stress that is required to withstand (see Table 5), cock assembly is divided into group 1 and group 2. - group 1. cock assembly mounted on gas appliance which is not affected by bending stress caused by tubeline equipment installation (e.g., use rigid support); - group 2. used in any situation inside or outside gas appliance, usually without mounting bracket. 4.3 Classify in accordance with gas category used It can be divided into liquefied petroleum gas (Y) cock assembly, natural gas (T) cock assembly, artificial gas (R) cock assembly.5 Requirements5.1 General requirements 5.1.1 When it is mounted and used according to manufacturer’s instructions, the design, manufacturing and assembly of cock assembly shall ensure correct operation of each function. 5.1.2 All pressure-withstanding parts of cock assembly shall be able to withstand mechanical and thermal stress it may withstand without any deformation to affect safety. 5.1.3 Before connected with cock body, each additional device is required to comply with this Standard and following conditions before formed to cock assembly. - Thermoelectric flameout protection device shall meet requirements of CJ 5.2.6 Removing and re-mounting 5.2.6.1 All components required removing during maintenance and adjustment, shall be able to be removed and mounted by general tool. The structures or marks of these components shall ensure that they are not easily mounted wrongly in the manufacturer’s method. 5.2.6.2 For closure component which may be removed during maintenance and adjustment, including components for measuring and testing, the structure shall ensure that it meets tightness requirements mechanically (e.g. connection between metals, O-ring). It shall not use jointing compound like sealing liquid, sealant or sealing tape. 5.2.6.3 Closing component that are not allowed to be removed shall be sealed in the method which is able to show disturbing signs (e.g. paint), or be fixed by special tool’s fastening. 5.3 Material 5.3.1 General requirements Material quality, size used and method for assembling each component shall make structure and performance characteristics safe and reliable. When it is mounted and used according to manufacturer’s instructions for use, performance characteristics shall not be obviously changed during reasonable use period. Under these situations, all components shall withstand possible mechanical, chemical and thermal conditions during use. 5.3.2 Enclosure 5.3.2.1 Enclosure used to isolate air and gas shall be made of metal material. 5.3.2.2 If enclosure uses aluminum alloy, it may refer to provisions of GB/T 8733 or other current national standards. 5.3.2.3 Sealing material like O-g... ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. |
