CJ/T 393-2012Cock assembly for domestic gas appliance (English PDF)

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 appliance

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.

4.1 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.

5.1 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

5.3.2.3 Sealing material like O-g...

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