GB 26730-2011 English PDF (GB26730-2011)

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GB 26730-2011: [GB/T 26730-2011] Sanitary ware -- Gravity water flushing devices and supports
GB 26730-2011
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 
Sanitary ware - Gravity water flushing devices and
supports
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
set in a ceramic flush tank, OR a flush tank installed in other furniture in a
hidden manner.
3.6
Hidden cistern
The integral flush tank installed inside the concealed work. When matched
with the wall-mounted toilet, it is composed of the integral flush tank and the
mounting support.
[GB/T 9195-2011, definition 3.4.15]
3.7
Support
A support which is fixed in a concealed work, to bear the wall-mounted
sanitary ware; it includes corresponding pipe fittings and connectors.
3.8
Front plane surface of support
The plane formed by the front surface of the support, which mainly bears the
load and supports the parts of the sanitary ware.
3.9
Actuating plate
The interface for the hidden cistern to accept changes in external actions
AND drive the corresponding mechanism to complete the drainage function.
3.10
Static pressure
When the fill valve is completely closed, the stable pressure value in the
water supply pipeline.
Note: Rewrite GB/T 26750-2011, definition 3.5.
3.11
Dynamic pressure
When the fill valve is fully opened, the stable pressure value in the pipeline
in front of the fill valve.
3.17
None sealed water level
The lowest water level that can overflow the flush tank, under the status that
the flush valve is closed and the overflow port is blocked, which is
abbreviated as NL.
3.18
Water hammer
When water flows normally in the pipeline, the instantaneous pressure rise
in the pipeline, which is caused by the closing of the valve.
[GB/T 26750-2011, definition 3.9]
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,
or obvious scratches, decoration damage and other defects.
5.1.1.3 After installation, the visible surface of the coating and plating shall not
have un-plated or uncoated locations. The surface shall be uniform. There shall
be no delamination, peeling off, blistering, etc.
rated water replenishment ratio shall not exceed ±5%.
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.
5.2.4.2 Tightness at dynamic pressure
After the test of tightness at dynamic 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
5.2.7.1 The permanent CL line mark shall be marked on the fill valve.
5.2.7.2 After the test of anti-siphon function, the position of the marked CL line
shall not be higher than the position where the CL line is actually measured.
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 consecuti...