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GB 25501-2010 PDF in English


GB 25501-2010 (GB25501-2010) PDF English
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GB 25501-2010: PDF in English

GB 25501-2010
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.060
Y 71
Minimum Allowable Values of Water Efficiency
and Water Efficiency Grades for Faucets
ISSUED ON: JANUARY 10, 2011
IMPLEMENTED ON: JULY 1, 2011
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Terms and Definitions ... 4 
4 Technical Requirements ... 5 
5 Test Methods ... 6 
6 Description of Water Efficiency Grade ... 7 
Foreword
In this Standard, 4.2 and 4.4 are compulsory; the remaining is recommended.
This Standard was proposed by National Development and Reform Commission, and
National Office of Water Conservation.
This Standard shall be under the jurisdiction of National Technical Committee on
Industrial Water Conservation of Standardization Administration of China, Products
and Appliances Water Use Efficiency Subcommittee.
The drafting organizations of this Standard: China National Institute of Standardization,
National Drainage and Water-saving Equipment Product Quality Supervision and
Inspection Center, JOMOO Group, SUNLOT Sanitary Wares, HHSN Group Co., Ltd.,
JOYOU Sanitary Ware, Tangshan HUIDA Ceramic Group, Foshan FAENZA Sanitary
Ware Co., Ltd., Fujian FUQUAN Group Co., Ltd., Xuancheng Yinhe Jieju Co., Ltd.,
Roca Sanitary Ware (Foshan) Co., Ltd., HOCHENG Group, Guangdong CAE Sanitary
Industry Co., Ltd., Foshan MICAWA Ceramic Co., Ltd., Heshan Kangliyuan Sanitary
Industry Co., Ltd., Hefei Tiannuo Measurement and Control Technology Co., Ltd.
The main drafters of this Standard: Baixue, Zhu Shuangsi, Li Aixian, Liang Xiuying,
Cheng Xiaomin, Jin Guangchun, Wang Ruohong, Lin Xiaofa, Hong Jiancheng, Tang
Minjun, Wang Jianye, Cai Jianshe, Song Zichun, Yan Bangping, Hong Jinfu, Yi
Mingqing, Lixiao, Shao Zeliang, Huang Zhenhuai, Deng Guangshen, Huang Jiyuan,
Jiangping.
Minimum Allowable Values of Water Efficiency
and Water Efficiency Grades for Faucets
1 Scope
This Standard specifies the minimum allowable values of water efficiency, water
conservation evaluation value, water efficiency grades, technical requirements and
test methods for faucets.
The faucets stipulated in this Standard are applicable to the installation on hot and
cold-water pipelines on building facilities, where water supply pressure is not more
than 1.0 MPa; medium temperature is not more than 90 °C.
This Standard is not applicable to faucets for bathtub in the bathtub outlet part; faucets
for shower; faucets for washing machine; faucets for temperature control.
2 Normative References
Through the reference in this Standard, the clauses in the following documents
become clauses of this Standard. In terms of references with a specific date, all the
subsequent modification orders (excluding the corrected content) or revised editions
are not applicable to this Standard. However, the various parties that reach an
agreement in accordance with this Standard are encouraged to explore the possibility
of adopting the latest versions of these documents. In terms of references without a
specific date, the latest versions are applicable to this Standard.
GB 18145 Ceramic Cartridge Faucets
CJ/T 194 Non-contact Water Supply Device
QB 1334 General Technical Specification for Faucets
3 Terms and Definitions
The following terms and definitions are applicable to this Standard.
3.1 Difference among Flow Rates
Difference among flow rates refers to the difference of faucets (with accessories)
between the highest average flow and the lowest average flow under different dynamic
pressures.
3.2 Minimum Allowable Values of Water Efficiency for Faucets
Minimum allowable values of water efficiency for faucets refers to the maximum flow
of faucets under the test conditions stipulated in this Standard, and under the
circumstance of complying with the requirements of processing assembly quality,
appearance quality and functional performance.
3.3 Water Efficiency Grades for Faucets
Under the test conditions stipulated in this Standard, and under the circumstance of
complying with the requirements of processing assembly quality, appearance quality
and functional performance, faucets are divided into three grades in accordance with
the difference among flow rates and the flow rate value. Grade-1 signifies the highest
water efficiency; Grade-3 signifies the minimum allowable values of water efficiency.
3.4 Rated Water Efficiency Grade
Rated water efficiency grade refers to the water efficiency grade for faucets specified
by the manufacturer in accordance with the stipulations in this Standard when faucets
are exiting factory.
4 Technical Requirements
4.1 Basic Requirements
Under the test conditions stipulated in this Standard, ceramic cartridge faucets shall
comply with the performance requirements stipulated in GB 18145. General faucets
shall comply with the performance requirements stipulated in QB 1334. Non-contact
faucets shall comply with corresponding performance requirements stipulated in CJ/T
194.
4.2 Difference among Flow Rates (F)
Difference among flow rates shall be not more than 0.1 L/s.
4.3 Water Efficiency Grades for Faucets
Under the dynamic pressure of (0.10 ± 0.01) MPa, in accordance with the flow of
faucets (with accessories) in Table 1, determine faucets’ water efficiency grade. The
water efficiency grade shall be not lower than the rated water efficiency grade. In terms
of double-gear faucet, the water efficiency grade of the large gear shall be not lower
than Grade-3. The water efficiency grade that the small gear actually reaches shall be
considered as the water efficiency grade of double-gear faucet.
Table 1 -- Faucet Water Efficiency Grade Index
4.4 Minimum Allowable Values of Water Efficiency for Faucets
The minimum allowable values of water efficiency for faucets shall be Grade-3 of water
efficiency.
4.5 Faucet Water Conservation Evaluation Value
Faucet’s water conservation evaluation value shall be Grade-2 of water efficiency.
5 Test Methods
Difference among flow rates (F) shall be tested respectively for 3 times under the
dynamic pressures of (0.10 ± 0.01) MPa, (0.20 ± 0.01) MPa and (0.30 ± 0.01) MPa.
Respectively calculate the average value; calculate the difference between the highest
average flow and the lowest average flow.
In the 3 times of test, at (0.10 ± 0.01) MPa, the flow is respectively f11, f12 and f13. The
average value is F1 = (f11 + f12 + f13)/3.
In the 3 times of test, at (0.20 ± 0.01) MPa, the flow is respectively f21, f22 and f23. The
average value is F2 = (f21 + f22 + f23)/3.
In the 3 times of test, at (0.30 ± 0.01) MPa, the flow is respectively f31, f32 and f33. The
average value is F3 = (f31 + f32 + f33)/3.
The maximum average value is F3 (the actual maximum value); the minimum average
value is F1 (the actual minimum value).
Difference among flow rates F = F3 (the actual maximum value)  F1 (the actual
minimum value).
The difference among flow rates of faucets and flow test device shall satisfy the
stipulations in Figure 1.
Faucets shall be connected to the test device in accordance with Figure 1. Switch on
the handle to the maximum position; import the stipulated pressure value to the water
inlet.
In the flow test of single-handle double-controlled faucet, on the cold-water end, switch
on the handle to the maximum position. Then, through the cold-water end, rotate the
Grade-1 Grade-2 Grade-3 Water Efficiency Grade
Flow /(L/s)
handle to the maximum position on the hot-water end; take the maximum value of the
flow.
In the flow test of double-handle double-controlled faucet, respectively switch on the
handle to the maximum position on the cold-water end and the hot-water end; take the
maximum value of the two flows.
In the flow test of single-handle single-controlled faucet, switch on the handle to the
maximum position; take the flow value.
Figure 1 -- Flow Test Device
6 Description of Water Efficiency Grade
In accordance with the requirements and the test results in this Standard,
manufacturers shall determine products’ flow rate, rated water efficiency grade and
exit-factory instruction. In addition, on the package, manufacturers shall indicate
products’ flow rate, rated water efficiency grade and the serial number of the Standard
being implemented.
__________ END __________
Flow Meter
Pressure
Gauge
Sample
Sample
Sample
Collector
Flow Measurement
0.5 ~ 2.5 times of
pipe diameter
Straight pipe section with at least
20 times of pipe diameter
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.