GB 26730-2011 PDF English
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GB 26730-2011: Sanitary ware - Gravity water flushing devices and supports---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/GB26730-2011
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.140.70
Q 31
Sanitary ware - Gravity water flushing devices and
supports
Issued on. JULY 20, 2011
Implemented on. MAY 01, 2012
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 5
4 Materials... 8
5 Technical requirements... 8
6 Test method... 17
7 Inspection rules... 28
8 Markings and identifications... 31
9 Packaging, transportation, storage... 31
Appendix A (Normative) Connection size between support and wall-mounted
toilet... 33
Appendix B (Normative) Test method of torque and tensile strength... 35
Appendix C (Normative) Test of anti-siphon function of fill valve... 37
Appendix D (Normative) Test method of water hammer... 40
Appendix E (Normative) Test method of durability... 42
Appendix F (Normative) Test method of forward thrust of external flush tank 44
Appendix G (Normative) Test method of safety load of sanitary ware's support
... 45
References... 48
1 Scope
This standard specifies the terms and definitions, technical requirements, test
methods, inspection rules, markings and identifications, packaging,
transportation, storage of gravity water flushing devices for toilet AND supports
of sanitary ware.
This standard is applicable to the flushing devices that are installed on cold
water supply pipelines, which has a static pressure of not greater than 0.6 MPa
AND functions by the gravity of the water, for various toilets, as well as the
supports for wall-mounted sanitary ware.
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 standard.
GB/T 3768 Acoustics - Determination of sound power levels of noise sources
using sound pressure - Survey method using an enveloping measurement
surface over a reflecting plane
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 6952 Sanitary wares
GB/T 7307 Pipe threads with 55 degree thread angle where pressure-tight
joints are not made on the threads
GB/T 9195 Classification and terms of building and sanitary ceramics
GB/T 10125-1997 Corrosion tests in artificial atmospheres - Salt spray tests
GB/T 17219 Standard for safety evaluation of equipment and protective
mater
GB/T 23448 Flexible hose for sanitary tapware
3 Terms and definitions
The terms and definitions as established in GB/T 9195 AND the following terms
and definitions apply to this document.
3.1 Flush tank
A special flush tank, which is equipped with such accessories as fill valves,
flush valves, driving devices, etc., for direct flushing of toilets or other
sewage devices.
3.2 Fill valve
A device used in the flush tank, to control the water level to a preset position.
3.3 Flush valve
A device in the flush tank, that opens or closes the drain hole.
3.4 Affixes of flush tank
The components other than the fill valve and the flush valve, which are used
to manipulate or assist the flush tank to complete the flushing action, as well
as the components for installing or fixing the flush tank or flush tank's
accessories.
3.5 Inner flush tank
A flush tank that does not have to bear external force, has no appearance
requirements, only guarantees the flushing function. It is a flush tank usually
set in a ceramic flush tank, OR a flush tank installed in other furniture in a
hidden manner.
4 Materials
4.1 For all materials in the flushing device that are in direct contact with drinking
water, they shall meet the requirements of GB/T 17219.Other materials shall
meet the requirements of product performance.
4.2 When the toilet uses seawater, reclaimed water, rainwater or other water
containing chemical components, the materials and seals used in the gravity
flushing device for the toilet shall meet the corresponding requirements for use.
The technical requirements and test methods may be agreed between the
supplier and the buyer.
5 Technical requirements
5.1 General technical requirements
5.1.1 Surface quality
5.1.1.1 The outer surface of the metal parts shall not have defects such as
shrinkage holes, blisters, cracks or pores; the inner cavity shall not have
adhered molding sand.
5.1.1.2 The surface of the plastic part shall not have obvious ripples, weld marks,
5.1.1.4 The appearance quality of ceramic parts shall meet the requirements of GB 6952.
5.1.2 Corrosion resistance of coating on exterior parts
After the acid salt spray test, the appearance level of the visible coating surface
after installation shall meet the requirements of level 6 in GB/T 6461-2002.
5.1.3 Installation and removal
All parts shall be easy to install and disassemble. After installation, all movable
parts shall move flexibly without jamming.
5.1.4 Drive mode
It shall not use the open-stop (intermittent) drain-close drive mode.
5.1.5 Water volume adjustment function
The flushing device shall have the function of adjusting the water volume. For
special products that require a fixed water consumption, they can be as required
by the contract.
5.2 Technical requirements for fill valve
5.2.1 Thread
5.2.2 Water replenishment ratio
5.2.3 Inlet water flow
Under the dynamic pressure of 0.05 MPa, the inlet water flow rate shall not be
less than 0.05 L/s. Under the dynamic pressure of 0.5 MPa, the inlet water flow
rate shall not be greater than 0.33 L/S.
5.2.4 Tightness
5.2.4.1 Tightness at static pressure
After the test of tightness at static pressure, the rising height of the water level
in the flush tank shall not be greater than 8 mm. Meanwhile there shall be no
visible drips after the fill valve is closed.
5.2.5 Pressure resistance
After the test of pressure resistance, the fill valve shall be free from leakage,
deformation, sweating, or any other damage.
5.2.6 Resistance to thermal denaturation
After the test of resistance to thermal denaturation, the fill valve shall not have
leakage, deformation, sweating and any other damage. For the fill valve with
the water replenishment pipe, the water replenishment pipe shall not fall off.
5.2.7 Anti-siphon function
5.2.8 Reopen function
Carry out the reopen function test. When draining to the specified test height,
the fill valve shall be able to automatically open, to fill water; meanwhile, after
reaching to the working water level, it shall be able to automatically close. The
height difference of the working water level for 5 consecutive water fillings shall
not be greater than 5 mm.
5.2.9 Water hammer
Carry out the test in accordance with the provisions of 6.14.When the fill valve
is closed, there shall be no water hammer that increases the pressure by more
than 0.2 MPa.
5.2.10 Water filling noise
The noise generated shall, during the water filling process, not exceed 55 dB(A).
5.2.11 Durability of fill valve
After the durability test, the fill valve shall be free of leakage or any other failures.
5.3 Technical requirements for flush valve
5.4 Technical requirements for flush tank
In addition to the requirements of 5.1, 5.2 (except 5.2.8 and 5.2.11) and 5.3.1,
5.3.2, 5.3.5, the components of the flush tank shall also meet the following
requirements. When the matched installation of the flush tank and the toilet
requires the use of sanitary ware support, it shall meet the requirements of 5.5.
5.4.1 Safe water level
After the installation of each part of the flush tank (excluding the hidden cistern),
the relative water level shall meet the requirements of Figure 2.
Unit is mm
5.4.2 Assembly requirements
After the fill valve and the flush valve are installed in the flush tank, they shall
be firm and reliable, free from jamming; each moving part shall work flexibly.
After filling water to the working water level, there shall be no leakage
everywhere in the flush tank.
5.5 Technical requirements for sanitary ware supports
5.5.1 General requirements
5.5.2 Safety load
The maximum displacement of the front end of the standard test bracket of the
support shall not be greater than 10 mm.
5.5.3 Flatness
Except for the pipes and pipe fittings that are fixedly connected to sanitary ware,
AND the fixed feet that are fixed to the wall and the ground, FOR the support,
all the parts on the support which include the pipe fixing parts, the processed
projections of the parts, there shall be no deformation that exceeds 1 mm of the
front plane surface of the support, after installation, in any plane within the range
of 600 mm × 600 mm.
6 Test method
6.1 Test preparation
6.1.1 Standard flush tank
The inner cavity's size of the standard flush tank for the test is length × width ×
height (400 mm × 175 mm × 300 mm).
6.2 Surface quality
Under the illumination condition where the diffused light on the product surface
is at least 300 lx, at a position about 600 mm from the product, visually inspect
the surface quality of metal parts, plastic parts and coatings;
Follow the provisions of GB 6952 to test the appearance quality of ceramic parts.
6.3 Corrosion resistance test of coating/plating
Follow the provisions GB/T 10125-1997 to carry out the 24 h acid salt spray test.
6.4 Installation and removal
For the assembled product, use hand touch to check whether the movable parts
move flexibly AND whether there is jamming.
6.5 Drive mode
Apply an external force to the product's flush switch to open it AND quickly
(within 1 s) remove the external force, to check whether it can drain water
according to a fixed volume and automatically close.
6.6 Fill valve's thread
6.7 Determination of water replenishment ratio
Install the fill valve in a standard flush tank. At the pressure as specified in
5.2.2.2, measure the total water inflow and water replenishment, within the
range of 60 s ± 3 s. Use formula (1) to calculate the water replenishment ratio.
The result is expressed as a percentage.
6.8 Determination of filling flow
Install the fill valve in a standard flush tank (for the fill valve with a water
replenishment pipe, it shall put the water replenishment pipe in the flush tank).
Use a graduated cylinder to measure 6 L of water. Pour it into the flush tank.
Make an obvious mark of the liquid level. THEN, empty the water in the flush tank.
6.9 Tightness of fill valve
6.10 Pressure resistance test of fill valve
Install the fill valve on a pressure test pump OR other pressure device with the
same effect. Manually close the fill valve. Pressurize it to 1.6 MPa ± 0.02 MPa.
under this pressure, hold for 5 min ± 10 s. Observe whether there are cracks,
deformations, water seepage in various parts of the valve body.
6.15 Measurement of water inlet noise
6.16 Durability test
The durability of the fill valve, flush valve, flush tank shall be tested in
accordance with the provisions of Appendix E.
6.17 Test of strength of flush valve joint
The strength of the flush valve joint shall be tested in accordance with the
provisions of Appendix B.
6.20 Determination of drain flow
6.20.1 Determination of drain flow of flush valve
6.21 Corrosion resistance test of flush valve seal
6.30 Corrosion resistance test of support
For the corrosion resistance of the load-bearing parts which are used to fix the
support, AND the metal parts which are used to fix the sanitary but inconvenient
to replace and maintain after installation, it is subject to a 200-hour neutral salt
spray test according to GB/T 10125-1997; THEN, according to GB/T 6461-2002,
report the appearance class;
For the corrosion resistance of metal parts, which are used to fix sanitary ware
and which can be replaced after decoration on the support, it is subject to a 4-
hour neutral salt spray test according to GB/T 10125-1997; THEN, according to
GB/T 6461-2002, report the appearance class.
6.31 Fixing strength test of pipe fittings
7 Inspection rules
7.1 Inspection classification
Product inspection is divided into exit-factory inspection and type inspection.
7.2 Exit-factory inspection
7.2.1 Inspection items
The exit-factory inspection items shall be carried out in accordance with Table 3.
7.2.2 Group-batching and sampling scheme
Perform group-batching of products of the same kind, same type, same model.
The samples required for exit-factory inspection are randomly selected from the
grouped batches. Sampling scheme is carried out according to Table 4.
7.2.3 Judgment rules
If all the inspection items are qualified, the batch of products is determined to
be qualified. However, if there is one or more unqualified items, the batch of
products is determined to be unqualified.
7.3 Type inspection
7.3.1 Inspection items
Type inspection includes all the items in Chapter 5.
7.3.2 Inspection conditions
When one of the following conditions occurs, type inspection shall be carried out.
7.3.3 Group-batching rules and sampling scheme
7.3.4 Inspection items, minimum sample size, inspection process
7.3.5 Judgment rules
When all items are qualified after inspection, the batch of products is judged to
be qualified. However, if one or more items are unqualified, the batch of
products is judged to be unqualified.
8 Markings and identifications
8.1 Permanent marking
8.1.1 The trademark shall be marked in an obvious position of the product.
8.1.2 There shall be a CL line mark on the fill valve.
8.1.3 The rated flushing volume and marking line of the flush tank shall be
marked on the inner wall of the flush tank OR on the flush valve.
8.2 Product identification
The product or single package shall at least identify the following. product name,
specification model, implemented standard, registered trademark, production
date or batch number, manufacturer's name, place of origin.
8.3 Certificates and instructions
The smallest package of the product shall be accompanied by a exit-factory
inspection certificate; provide an installation and use manual.
9 Packaging, transportation, storage
9.1 Each set of products shall be packaged separately. It shall ensure that there
is no collision between the products.
9.2 During transportation, the product shall be protected from squeezing and
bumping.
9.3 The product shall be stored in a well-ventilated place. It shall not be co-
stored with acids, alkalis or corrosive materials.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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