GB/T 21384-2016 PDF English
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GB/T 21384-2016 | English | 90 |
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Electric Water-Heater Safety Valve
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GB/T 21384-2008 | English | 399 |
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Electric water-heater safety valve
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GB/T 21384-2016: Electric Water-Heater Safety Valve---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/GBT21384-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.240
J 16
Replacing GB/T 21384-2008
Electric Water-Heater Safety Valve
Issued on. AUGUST 29, 2016
Implemented on. MARCH 1, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Terms and Definitions... 6
4 Structural Types and Parameters... 7
5 Requirements... 8
6 Materials... 12
7 Inspection Methods... 12
8 Inspection Rules... 14
9 Mark, Package, Transportation and Storage... 15
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).
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee for
Standardization of Safety Relief Device (SAC/TC 503).
Drafting organizations of this Standard. AMY Holding Group Co., Ltd.
Chief drafting staffs of this Standard. Chen Xuefeng, Cai Yancan, Zheng Qilong, and
Ye Zhaogui.
The historical edition replaced by this Standard is as follows.
--- GB/T 21384-2008.
Electric Water-Heater Safety Valve
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”).
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.
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 6×104.
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
8.1 Inspection items
The inspection items, technical requirements, and test methods shall conform to the
provisions of Table 5.
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.
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.
...... Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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