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GB/T 21384-2016Electric water-heater safety valve (English PDF)

电热水器用安全阀

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

August 29, 2016

Implementation date

March 1, 2017

Scope

GB/T 21384-2016 is the English-translated version of 电热水器用安全阀.

GB/T 21384-2016 is the Chinese standard "Electric Water-Heater Safety Valve".

Its scope clause reads: This Standard specifies the terms and definitions, structural type and parameter, requirements, materials, inspection methods, inspection rules, mark, package, transportation, and storage of electric water-heater safety valve (hereinafter referred to as "safety valve").

This Standard is applicable to the safety valve installed on the water inlet pipe of the electric water-heater; the set pressure range is of 0.025MPa~1.0MPa; the safety relief pressure of safety valve. the closed type is of 0.6MPa~0.9MPa, the opened type is 0.15MPa~0.35MPa; the medium temperature is no greater than 95°C. Its clauses include terms and definitions; structural types and parameters; requirements; materials; inspection methods; inspection rules; mark, package, transportation and storage.

It was issued by the General Administration of Quality Supervision, Inspection and Quarantine on AUGUST 29, 2016 and took effect on MARCH 1, 2017.

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Document preview — GB/T 21384-2016

National Standard of the People's Republic of China

ICS: 13.240
Classification: J 16
Replacing: GB/T 21384-2008

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Foreword3
1 Scope5
2 Normative References5
3 Terms and Definitions6
4 Structural Types and Parameters7
5 Requirements8
6 Materials12
7 Inspection Methods12
8 Inspection Rules14
9 Mark, Package, Transportation and Storage15

Foreword

This Standard was drafted as per the rules specified in GB/T 1.1-2009. This Standard replaced GB/T 21384-2008 Electric Water-Heater Safety Valve.

Compared with GB/T 21384-2008, this Standard has the following major technical changes besides the editorial modifications.

--- Delete the term of "open pressure"; add the term of "set pressure" (see Sub-clause 3.7 of this Edition; and Sub-clause 3.7 of 2008 Edition);

--- Delete the requirements for "safety valve shall conform to the provisions of this Standard", and "discharging medium of safety valve shall not be leaked from the outlet" (see Sub-clause 5.1.1 and Sub-clause 5.1.5 of 2008 Edition);

--- Modify the length of inlet male thread and outlet female thread (see Sub-clause 5.2.2 of this Edition; Sub-clause 5.2.2 of 2008 Edition);

--- Modify the requirements for bearing torque connecting the threads (see Sub-clause 5.2.3 of this Edition; Sub-clause 5.2.3 of 2008 Edition);

--- Modify the spring index (see Sub-clause 5.6.4 of this Edition; Sub-clause 5.6.2.4 of 2008 Edition);

--- Modify the requirements for permanent deformation of spring (see Sub-clause 5.6.6 of this Edition; Sub-clause 5.6.3 of 2008 Edition);

--- Add the requirements for high and low temperature test of sealing gasket (see Sub-clause 5.8.2 of this Edition);

--- Modify the requirements for neutral salt spray test (see Sub-clause 5.10.3 of this Edition; Sub-clause 5.10.3 of 2008 Edition);

--- Modify the requirements for pressure relief inside (see Sub-clause 5.11.2 of this Edition; Sub-clause 5.11.2 of 2008 Edition);

--- Modify the requirements for flow rate (see Sub-clause 5.11.3 of this Edition; Sub-clause 5.11.3 of 2008 Edition);

--- Modify the lifetime (see Sub-clause 5.11.4 of this Edition; Sub-clause 5.11.4 of 2008 Edition);

--- Add the sampling method for type test (see Sub-clause 8.3.3 of this Edition).

1 Scope

This Standard specifies the terms and definitions, structural type and parameter, requirements, materials, inspection methods, inspection rules, mark, package, transportation, and storage of electric water-heater safety valve (hereinafter referred to as "safety valve").

2 Normative References

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this document.

GB/T 1239.2-2009 Cold Coiled Helical Springs Technical Specifications - Part 2: Compressions Spring

GB/T 5231 Designation and Chemical Composition of Wrought Copper and Copper Alloys

GB/T 6461-2002 Methods for Corrosion Testing of Metallic and other Inorganic Coatings on Metallic Substrates - Rating of Test Specimens and Manufactured Articles Subjected to Corrosion Tests

GB/T 6463 Metallic and other Inorganic Coatings - Review of Methods of Measurement of Thickness

3 Terms and Definitions

The following terms and definitions are applicable to this document.

3.1 Opened type safety valve

The relief inside part of the safety valve only has a one-way check function, installed on the valve of opened type electric water-heater.

3.2 Enclosed type safety valve

The relief inside part of the safety valve not only has check function, but also the valve clack can automatically release the pressure, when the pressure in the container is higher than the setting pressure; installed on the valve of enclosed type electric water-heater.

3.3 Relief inside parts

When the water supply system is stopped, the media in the container can't be returned to the pipe part; or when the pressure in the container is higher than the setting pressure, the media can't be automatically released to the part of the water supply system.

3.4 Relief outside parts

When the pressure in the water supply system or container is higher than the pressure relief outside, the media can be released from the discharge port.

3.5 Pressure relief inside

The pressure released by the action of valve clack in the relief inside part, when the pressure in the container is raised in the process of heating the electric water-heater.

4 Structural Types and Parameters

4.1 Typical structure

The safety can be divided into the opened type and enclosed type according to the usage; the typical structure can refer to Figure 1 and Figure 2.

5 Requirements

5.1 General

5.1.1 The safety valve shall be equipped with a removable filter.

5.2 End connection

5.2.1 The inlet connecting mode of safety valve is male thread; while the outlet connecting mode is female thread; the accuracy shall be no less than Class-B accuracy stipulated in GB/T 7307-2001.

5.4 Shell

5.4.1 The shell shall be free from the shrinkage, cracks, pores and the like defects.

5.4.2 The inlet of enclosed type safety valve shell is equipped with limit boss; which controls the stretching amplitude of the valve clack action.

5.5 Relief inside parts

5.5.1 The enclosed type safety valve clack and sealing surface of relief inside sealing gasket is matched by linear sealing.

5.5.2 The relief inside parts shall be flat and smooth without the defects affecting the sealing.

5.6 Spring

5.6.1 The spring materials shall conform to the provisions of GB/T 24588.

5.6.2 The slenderness ratio (ratio between free height and intermediate diameter) of spring shall be less than 3.7.

5.7 Wrench

The safety valve shall be equipped with manual discharging wrench, and the wrench setting shall not influence the normal discharging of the safety valve.

5.8 Sealing gasket

5.10 Surface quality

5.10.1 The shell surface shall perform the plating or passivation treatment, the surface color and luster shall be the same without pattern, skin exposure, pinhole, scratch, and the like defects.

5.11 Performance

5.11.1 Shell strength

Through the test specified in Sub-clause 7.3.1, the safety valve shell shall be free from leakage or structural damage.

5.11.3 Flow rate

When the water supply system pressure is under 0.1MPa±0.02MPa, and the safety valve outlet is opened, supply the water from the inlet, then the flow rate on the outlet shall be no less than 0.17L/s;

5.11.4 Service life

The service life of safety valve switch shall meet the requirements stipulated in Sub-clause 5.11.2 after using the switch for 6 x 10^4.

6 Materials

The major materials of safety valve shall conform to the provisions of Table 3; other types of materials with using performance no less than the provisions of this Standard are allowed to serve as alternative materials.

7 Inspection Methods

7.1 Structural dimension

The structural dimension shall be inspected by the gauge with the corresponding accuracy level.

7.2 Surface quality

7.2.1 The surface quality shall adopt visual examination.

7.3 Performance

7.3.1 Shell strength

Connect the safety valve shell with the test bench, enclose each channel; inject water, discharge air and exert pressure of 1.5MPa; after maintaining for 60s, check the shell, which shall be free from permanent deformation and leakage.

7.3.4 Set pressure

Connect the inlet of safety valve with the test bench; slowly boost; when the outlet is dropping water, the reading on the pressure gauge is the set pressure.

7.3.5 Sealing performance

Take the safety valve that is qualified in the set pressure test; enclose the discharge port and inlet; inject the pressure specified in Sub-clause 5.11.2; after maintaining for 5s; check the valve stem and valve body positions, which shall be free from leakage.

7.3.8 Service life

7.3.8.1 The test conditions shall conform to the provisions of Table 1.

8 Inspection Rules

8.3.2 Normally, at least one sampling type test shall be carried out annually.

8.3.3 The sample of type test can be taken randomly from the qualified products on the terminal of the production line; can also be taken randomly from the finished products warehouse; or can be taken randomly from the products that have been delivered to the users but not used and in the exit-factory state.

8.3.4 The type test shall meet all the technical requirements stipulated in Table 5.

8.1 Inspection items

The inspection items, technical requirements, and test methods shall conform to the provisions of Table 5.

9 Mark, Package, Transportation and Storage

9.1 There shall be clear and not-easy-to-change manufacturer logo on the shell.

9.2 The safety valve shall adopt the external package that can avoid friction and collision. […]

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.

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Normative references

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Editions of GB/T 21384

Edition	Title	Revision	Status
GB/T 21384-2016	Electric water-heater safety valve	current edition	Current
GB/T 21384-2008	Electric water-heater safety valve	previous edition	Superseded

This page sells the current edition, GB/T 21384-2016. Earlier editions are listed for reference only.

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