GB/T 21384-2016 PDF English
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Electric Water-Heater Safety Valve
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GB/T 21384-2016: PDF in English (GBT 21384-2016) GB/T 21384-2016
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
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
GB/T 7307-2001 Pipe Threads with 55 Degree Thread Angle where Pressure-
Tight Joints are not Made on the Threads
GB/T 9286 Paints and Varnishes - Cross Cut Test for Films
GB/T 10125 Corrosion Tests in Artificial Atmospheres - Salt Spray Tests
GB/T 24588 Stainless Steel Wires for Spring
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.
5.6.3 Both ends of relief outside spring shall have a support plane no less than 3/4
ring; the end of the support ring shall be tightly connected with the working ring. The
verticality of spring axis against the support plane on both ends shall meet the Class-
2 accuracy requirements stipulated in GB/T 1239.2-2009.
5.6.4 The spring index (the ratio between intermediate diameter and steel wire
diameter) can be selected within the range of 3~8.
5.6.5 The deviation limit for the outer and inner diameters of spring shall meet the
Class-2 accuracy requirements stipulate din GB/T 1239.2-2009.
5.6.6 After using test load to compress the spring finished product for 3 times, its
permanent deformation shall be no greater than 0.3% of free height.
5.6.7 The spring surface shall be free from cracks, folding, burr and the like defects.
The scratches and pits with depth no greater than half of the diameter allowable
tolerance are allowed to exist.
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
5.8.1 The hardness of relief outside sealing gasket shall be within the range of 65
IRHD~75 IRHD; while the hardness of relief inside sealing gasket shall be within the
range of 45 IRHD ~ 55 IRHD.
5.8.2 The sealing gasket shall be taken out after staying in the 100°C and -25°C
environment for 100h; the product shall be not sticky, not brittle, not smelly; have no
cracks, no hierarchical fracture phenomena.
5.9 Assembly
The axial matching between the valve clack and valve seat in the relief inside structure
shall be extended flexibly without jamming.
5.10 Surface quality
5.10.1 The shell surface shall perform the plating or passivation treatment, the
discharge air and exert pressure of 1.5MPa; after maintaining for 60s, check the shell,
which shall be free from permanent deformation and leakage.
7.3.2 Opened pressure relief inside
Connect the outlet of safety valve with the test bench; slowly boost; when the inlet is
dropping water, the reading on the pressure gauge is the opened pressure relief inside.
7.3.3 Pressure relief outside
Connect the outlet of safety valve with the test bench; enclose the inlet; slowly boost;
when the inlet is dropping water, the reading on the pressure gauge is the pressure
relief outside.
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.
7.3.6 Flow rate
Connect the safety valve in the using state with the water supply pipeline; inject water
from the inlet; its flow rate measured shall meet the requirements of Sub-clause 5.11.3.
7.3.7 Reverse sealing performance
Place the safety valve with inlet downward onto the test bench, inject water in the outlet
direction; so that the shell cavity is filled with water; observe its inlet, which shall meet
the requirements of Sub-clause 5.11.2.
7.3.8 Service life
7.3.8.1 The test conditions shall conform to the provisions of Table 1.
Table 4 -- Test Conditions
Test Conditions The Influent Parameters Pressure relief outside Pressure relief inside Set pressure
Media Water
Media temperature ≤40°C
Influent pressure Setting the maximum pressure + 0.05MPa
Setting the maximum
pressure + 0.05MPa 0.3MPa±0.02MPa
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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