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QB/T 5418-2019: Thermostatic shower system
QB/T 5418-2019
QB
LIGHT INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 91.140.70
Classification No.: Y71
Thermostatic shower system
恒温淋浴器
ISSUED ON: DECEMBER 24, 2019
IMPLEMENTED ON: JULY 01, 2020
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Categories ... 6
5 Working conditions ... 6
6 Materials ... 7
7 Requirements ... 7
8 Test method ... 15
9 Inspection rules ... 28
10 Sign, packaging, transportation, storage ... 30
Appendix A (Normative) Product installation structure size ... 32
Appendix B (Normative) Outlet water temperature test ... 34
Appendix C (Normative) Control function life test ... 36
Appendix D (Normative) Transfer switch life test ... 38
Appendix E (Normative) Service life test of rotating outlet pipe ... 40
Thermostatic shower system
1 Scope
This standard specifies the terms and definitions, classification, working conditions,
materials, requirements, test methods, inspection rules and signs, packaging,
transportation, storage of thermostatic showers (hereinafter referred to as "showers").
This standard applies to showers, which are installed in bathrooms, shower rooms, and
other sanitary facilities, under the conditions of nominal pressure 0.10 MPa ~ 0.50
MPa and water medium temperature 4 °C ~ 85 °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) is
applicable to this standard.
GB/T 1176 Casting copper and copper alloys
GB/T 2828.1-2012 Sampling procedures for inspection by attributes - Part 1:
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection
GB/T 4208-2017 Degrees of protection provided by enclosure (IP code)
GB 4706.1 Household and similar electrical appliances - Safety - Part 1: General
requirements
GB/T 5231 Designation and chemical composition of wrought copper and copper
alloys
GB/T 5270-2005 Metallic coatings on metallic substrates - Electrodeposited and
chemically deposited coatings - Revies of methods available for testing adhesion
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 7306.1 Pipe threads with 55 degree thread angle where pressure-tight joints
are made on the threads - Part 1: Parallel internal and taper external threads
6 Materials
6.1 Parts in contact with water shall not use corrosive materials, such as zinc alloy.
6.2 Casting copper materials shall comply with the provisions of GB/T 1176. Processed
copper materials shall comply with the provisions of GB/T 5231.
6.3 The stainless steel material shall be 06Cr19Ni10, which is specified in GB/T 20878-
2007, or other stainless steel materials with corrosion resistance not lower than the
above designations.
6.4 Other materials shall meet the performance requirements.
7 Requirements
7.1 Appearance
7.1.1 The surface of the plating shall be glossy and uniform. There shall be no defects
such as peeling, cracking, burning, exposed bottom, peeling off, black spots, obvious
pitting, burrs.
7.1.2 The surface of the coating shall be fine-structured, smooth, uniform in color. There
shall be no defects such as sagging, exposed bottom, obvious scratches, bumps.
7.1.3 The polished surface shall be smooth. There shall be no obvious defects such as
burrs, scratches, bumps.
7.1.4 There shall be no defects such as burrs and sharp corners on the surface, that is
accessible to the human body.
7.1.5 The thread surface shall be smooth and clean. There shall be no obvious dents,
broken teeth, and other defects.
7.1.6 There shall be no cracks, scars, pores, rusts, etc., on the surface of metal fittings.
7.2 Processing and assembly
7.2.1 The external sealing pipe thread of the product shall meet the requirements of
GB/T 7306.1 or GB/T 7306.2. The external non-sealing pipe thread of the product shall
meet the requirements of GB/T 7307, where the external thread shall not be lower than
the grade B precision of GB/T 7307.
7.2.2 The action of the assembled handle or handwheel shall be light, stable and free
from jamming; the transfer switch shall be switched smoothly, lightly and free from
jamming.
7.4.6.2 Flow reduction
Test according to 8.4.6.2. After 30 s, the temperature (Tm) of the shower mixture shall
deviate from the initial temperature (T0) by no more than 2 K, meanwhile the
temperature fluctuation shall not be greater than 1 K.
7.4.6.3 Changes in water supply pressure
Test according to 8.4.6.3. For non-shower outlets: The temperature of the mixed water
(Tm) shall not deviate from the initial temperature (T0) by more than 2 K. For shower
outlets or outlets for other purposes: In the first 5 s, the duration -- where the deviation
between the mixed water temperature (Tm) and the initial temperature (T0) exceeds 3 K
-- shall not be more than 1 s; after 5 s, the mixed water temperature (Tm) shall not
deviate from the initial temperature (T0) by more than 2 K, meanwhile the temperature
fluctuation shall not be greater than 1 K.
7.4.6.4 Changes in supply water temperature
Test according to 8.4.6.4. For non-shower outlets: The temperature of the mixed water
(Tm) shall not deviate from the initial temperature (T0) by more than 2 K. For shower
outlets or outlets for other purposes: In the first 5 s, the duration -- where the deviation
between the mixed water temperature (Tm) and the initial temperature (T0) exceeds 3 K
-- shall not be more than 1 s; after 5 s, the mixed water temperature (Tm) shall not
deviate from the initial temperature (T0) by more than 2 K, meanwhile the temperature
fluctuation shall not be greater than 1 K.
7.4.7 Safety
7.4.7.1 Failure of cold water
Test according to 8.4.7.1. After the cold water is turned off, the mixed water temperature
(Tm) shall not exceed 49 °C, when the water output within the first 5 s is not greater
than 200 mL; the mixed water temperature (Tm) shall not exceed 42 °C, when the water
output within the first 5 s is greater than 200 mL; the water output within the next 30 s
shall not exceed 300 mL. After the cold water supply is restored, the deviation of the
mixed water temperature (Tm) from the initial temperature (T0) shall not exceed 2 K.
7.4.7.2 Failure of hot water
Test according to 8.4.7.2. After the hot water is turned off, the water output in the first
5 s shall not exceed 250 mL; after the hot water supply is resumed, the deviation --
between the mixed water temperature (Tm) and the initial temperature (T0) -- shall not
exceed 2 K.
7.4.8 Outlet water temperature
Carry out the test according to 8.4.8. The maximum temperature of the outlet water
shall be 38 °C ~ 49 °C.
7.4.9 Service life
7.4.9.1 Control functions
Carry out 30000 cycle tests according to 8.4.9.1. During the test, the parts shall not be
broken, jammed, leaked. After the test is completed, the performance shall meet the
requirements of 7.4.2, 7.4.4, 7.4.5, 7.4.6, 7.4.7.
7.4.9.2 Transfer switch
Carry out 30000 cycle tests according to 8.4.9.2. During the test, the components shall
not be deformed or broken; the transfer switch shall not be jammed or reset. After the
test is completed, the sealing performance of the transfer switch shall meet the
requirements of 7.4.2. The operating torque shall not exceed 1.2 times the specified
value in 7.4.10.2.
7.4.9.3 Rotating outlet pipe
Carry out 30000 cycle tests according to 8.4.9.3. During the test, the components shall
not be deformed or broken; the connection between the outlet pipe and the body shall
not be deformed or broken; there shall be no water leakage in each component. After
the test is completed, the sealing performance of downstream of obturator shall meet
the requirements of 7.4.2.
7.4.9.4 Shower seat
After 2000 cycle life according to 8.4.9.4, the shower seat shall have no damage,
abnormal sound or other defects.
7.4.9.5 Slide bar
After 2000 cycle life in accordance with 8.4.9.5, the surface of the product shall not be
worn down to the base layer; the mobile frame is functional and meets the requirements
of 7.4.11.2.2.
7.4.10 Operational requirements
7.4.10.1 The operating force of the shower/non-shower switch and the hand-
held/overhead shower switch shall not be greater than 45 N, or the operating torque
shall not be greater than 1.7 N • m.
7.4.10.2 The operating torque of the flow and temperature adjustment switch shall not
be greater than 1.7 N • m; the operation is smooth without jamming or abnormal sound.
7.4.10.3 Under (0.50 ± 0.02) MPa dynamic pressure, the shower installed on the mobile
frame or shower seat shall be able to keep still; the rotating torque of the shower
7.4.12.1 Adhesion strength of coating
Carry out the grid-cut test in accordance with 8.4.12.1; it shall meet the requirements
of grade 1.
7.4.12.2 Adhesion strength of coating on metal substrate
After the thermal shock test is carried out according to 8.4.12.2, there shall be no cracks,
peeling or peeling off on the surface.
7.4.12.3 Adhesion strength of coating on plastic substrate
After the test is carried out according to 8.4.12.3, there shall be no cracks, blisters,
looseness, etc. on the surface.
7.4.13 Surface corrosion resistance
After the 24-hour acetic acid salt spray test is carried out according to 8.4.13, it shall
not be lower than the requirement of grade 9 in appearance rating (RA) in Table 1 of
GB/T 6461-2002.
7.4.14 Electrical performance requirements (only applicable to electronic showers)
7.4.14.1 Electrical safety
The safety performance of the electrical part shall meet the requirements of GB 4706.1.
7.4.14.2 Degree of protection provided by enclosure
The degree of protection provided by enclosure of the electrical part shall not be lower
than the requirements of IPX5 in GB/T 4208-2017.
7.4.14.3 Power-off and under-voltage protection
7.4.14.3.1 Power-off protection
When the power supply is interrupted in the ON state, it shall be able to automatically
OFF; when the power supply is interrupted in the OFF state, it shall be able to maintain
the OFF state.
7.4.14.3.2 Undervoltage protection
When the power supply voltage drops to the set under-voltage protection value, it shall
have a prompt function; when the under-voltage fails to work normally, it shall
automatically shut down.
7.4.14.4 Water cut-off protection
When it is no longer operated after being turned on, it shall be automatically turned off,
within the time specified by the manufacturer.
7.4.14.5 Battery box
The battery shall be able to be placed in an independently sealed battery box; it shall be
convenient to replace the battery. The battery box shall be able to replace the battery
many times; there shall be no damage or screw overflow. The battery box shall work
normally, after the moisture resistance test; the inner metal parts of battery box shall
not be corroded.
7.4.15 Resistance to high temperature and low temperature (only applicable to
electronic showers)
After the high temperature test and low temperature test, it shall meet the requirements
of 7.4.2, 7.4.14.1, 7.4.14.2.
7.4.16 Moisture resistance (only applicable to electronic showers)
After the moisture resistance test, it shall meet the requirements of 7.4.14.1 and 7.4.14.2.
7.4.17 Supporting requirements
7.4.17.1 The shower hose shall meet the requirements specified in GB/T 23448.
7.4.17.2 Ordinary shower heads shall meet the requirements specified in GB/T 23447;
digital display shower heads shall meet the requirements specified in QB/T 5281.
8 Test method
8.1 Appearance
Check visually. Visual inspection shall be carried out under natural scattered light or
white light without reflection, where the illuminance shall not be lower than 300 lx.
8.2 Processing and assembly
8.2.1 Pipe thread accuracy is tested by a thread gauge of corresponding accuracy.
8.2.2 Hand feel inspection for assembly.
8.2.3 The mark is inspected by visual inspection. During the visual inspection, fix the
product according to the installation manual and face the control device.
8.3 Dimensions
Measure according to the corresponding accuracy of the measuring tool.
8.4 Performance
8.4.2.3 Non-shower and shower manual switch
Install the shower on the test equipment according to the state of use. Adjust the switch
to the position of water flow to the non-shower position. Manually block the non-
shower outlet. The shower outlet is open. Apply (0.40 ± 0.02) MPa static pressure, from
the water inlet, for a duration of (60 ± 5) s. Check whether there is any leakage at the
shower outlet. Gradually reduce the pressure to (0.05 ± 0.01) MPa static pressure and
last for (60 ± 5) s. Check whether there is any leakage at the shower outlet.
Adjust the switch to the position where the water flows to the shower. Manually block
the shower outlet. Open the non-shower outlet. Apply (0.40 ± 0.02) MPa static pressure
to the water inlet and last for (60 ± 5) s. Check whether the non-shower outlet has any
leakage. Gradually reduce the pressure to (0.05 ± 0.01) MPa static pressure and
continue for (60 ± 5) s. Check whether there is any leakage at the non-shower water
outlet.
For showers with multiple shower outlets, each outlet mode shall be tested separately.
Note: If the shower outlet cannot be blocked, it can remove the shower head and replace it with
a plug.
8.4.2.4 Non-shower and shower automatic transfer switch
Install the shower on the test equipment, according to the state of use. Adjust the switch
to the non-shower position. The non-shower outlet and the shower outlet are both open.
Apply (0.40 ± 0.02) MPa dynamic pressure from ...