GB/T 26750-2011 PDF English
Search result: GB/T 26750-2011_English: PDF (GB/T26750-2011)
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Name of Chinese Standard | Status |
| GB/T 26750-2011 | English | 425 |
Add to Cart
|
0-9 seconds. Auto-delivery.
|
Sanitary ware -- Pressure assistant water flushing devices
| Valid |
BUY with any currencies (Euro, JPY, GBP, KRW etc.): GB/T 26750-2011 Related standards: GB/T 26750-2011
PDF Preview: GB/T 26750-2011
GB/T 26750-2011: PDF in English (GBT 26750-2011) GB/T 26750-2011
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.140.70
Q 31
Sanitary Ware – Pressure Assistant Water Flushing Devices
ISSUED ON: JULY 20, 2011
IMPLEMENTED ON: MARCH 01, 2012
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 ... 5
4 Product Classification ... 6
4.1 Pressure assistant water flushing devices ... 6
4.2 Pressure assistant flush tank ... 6
4.3 Pressure flushing valve ... 6
5 Materials, Spare and Accessory Parts ... 7
6 Technical Requirements ... 7
6.1 Pressure assistant flush tank ... 7
6.2 Flushometer valve ... 10
6.3 Non-contact pressure flushing valve ... 13
7 Test Methods ... 17
7.1 Test method for pressure assistant flush tank ... 17
7.2 Test method of flushometer valve ... 22
7.3 Test method of the non-contact pressure flushing valve ... 28
8 Inspection Rules ... 31
8.1 Inspection classification ... 31
8.2 Exit-factory inspection ... 31
8.3 Type inspection ... 32
8.4 Sampling method ... 35
9 Marking and Identification ... 35
10 Packaging, Transportation and Storage of Product ... 35
Appendix A (Normative) Test on Thread Torque and Tensile Strength ... 36
Appendix B (Normative) Water Hammer Test ... 38
Sanitary Ware – Pressure Assistant Water Flushing Devices
1 Scope
This Standard specifies the terms and definitions, product classification, materials and spare
parts, technical requirements, test methods, inspection rules, marking and labelling, packaging,
transportation and storage of pressure assistant water flushing devices.
This Standard applies to pressure assistant water flushing devices installed on water supply
pipelines with a static pressure no greater than 0.6MPa and used in conjunction with various
toilets.
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
Document.
GB/T 2423.1 Environmental Testing for Electric and Electronic and Electronic Products -
Part 2: Test Methods - Tests A: Cold
GB/T 2423.2 Environmental Testing for Electric and Electronic and Electronic Products -
Part 2: Test Methods - Tests B: Dry Heat
GB/T 2423.3 Environmental Testing for Electric and Electronic and Electronic Products -
Part 2: Test Methods – Test Cab: Damp Heat Steady State
GB/T 2828.1 Sampling Procedures for Inspection by Attribute - Part1: Sampling Schemes
Indexed by Acceptance Quality Limit (AQL) for Lot-by-Lot Inspection
GB/T 2829 Sampling Procedures and Tables for Periodic Inspection by Attributes (Apply
to Inspection of Process Stability)
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 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
3.6 Dynamic pressure
The steady pressure value in the pipeline when the flushing device is fully open.
3.7 Backflow preventer
A device or structure that is used to prevent water from flowing back into a water supply system
in the event of a system failure.
3.8 Consumption
The water consumption that is measured in a flushing cycle.
3.9 Water hammer
The instantaneous increase of pressure in the pipeline increases due to the closing of the valve,
when water flows normally in the pipeline.
3.10 Control distance
In the axial direction of the non-contact flushing device sensor receiving (or transmitting), when
the flushing device is reliably opened, the furthest distance between the analog board and the
sensor window.
4 Product Classification
4.1 Pressure assistant water flushing devices
It can be divided into pressure assistant flush tank and pressure flushing valve.
4.2 Pressure assistant flush tank
4.2.1 According to the mode of operation, it is divided into mechanical pressure assistant flush
tank and non-contact pressure assistant flush tank.
4.2.2 According to the installation form, it is divided into surface-mounted pressure assistant
flush tank and hidden pressure assistant flush tank.
4.3 Pressure flushing valve
4.3.1 According to the application, it is divided into closet pressure flushing valve and urinal
pressure flushing valve.
4.3.2 According to the mode of operation, it is divided into flushometer valve and non-contact
pressure flushing valve.
4.3.3 According to the pipe diameter, it is divided into DN15, DN20, DN25 and DN32 flushing
valves.
4.3.4 According to the installation form, it is divided into surface-mounted pressure flushing
valve and hidden pressure flushing valve.
4.3.5 The flushometer valves are divided into button type, wrench type, pedal type, twist handle
type and other operating modes of pressure flushing valves according to the drainage start mode.
5 Materials, Spare and Accessory Parts
5.1 All materials used in the product that are in direct contact with drinking water shall comply
with the provisions of GB/T 17219.
5.2 Products with electrical accessories shall comply with the provisions of GB 14536.1.
5.3 Other materials shall make the product meet the use requirements specified in this Standard.
6 Technical Requirements
6.1 Pressure assistant flush tank
6.1.1 General requirements
6.1.1.1 Working range
The working range of pressure assistant flush tank is static pressure of (0.10~0.90) MPa.
6.1.1.2 Installation and maintenance
The pressure assistant flush tank shall be designed so that it can be replaced and repaired with
standard tools.
6.1.1.3 Operating force
The tensile load of the wrench-driven chain or traction wire shall be no less than 60N; and its
fixed load of the opening mechanism and wrench shall be no less than 30N.
6.1.1.4 Connection of water supply
6.1.1.4.1 The precision of the pipe thread connecting the pressure assistant flush tank and the
water inlet pipeline shall meet the requirements of Class-B precision in GB/T 7307.
6.1.1.4.2 Connection thread torque and tensile strength
Carry out the test according to Appendix A, apply a torque of 6Nm to the thread of G3/8, and
apply a torque of 10Nm to the thread of G1/2, and the threaded connection parts shall not be
damaged.
6.1.2.6 All surfaces shall be free from sharp edges and corners that may cause harm to the
human body.
6.1.3 Performance
6.1.3.1 Flushing water consumption
Whether the pressure assistant flush tank has a water volume adjustment device or a flow
adjustment device is determined by the manufacturer. The water consumption of the pressure
assistant flush tank matched with the toilet shall meet the water consumption requirements of
the toilet in GB 6952 or the water consumption requirements specified by the product. For
pressure assistant flush tank that are not matched with sanitary ware, the flushing water
consumption of the product shall be indicated; and the flushing water consumption shall be
determined according to 7.2.4.3.
For products with adjustable flushing water volume, the method of water volume adjustment
shall be clearly stated on the product manual.
6.1.3.2 Influent flow
Carry out the test according to 7.1.3.1. Under the dynamic pressure (0.10±0.01) MPa, the
influent flow shall be no less than 0.05L/s.
6.1.3.3 Influent stability
Carry out the test according to 7.1.3.2. The water drainage of the pressure assistant flush tank
shall not exceed 10% of the indicated water consumption.
6.1.3.4 Sealing performance
Carry out the test according to 7.1.3.3. There shall be no leakage from the drain port and any
other parts of the pressure assistant flush tank.
6.1.3.5 Pressure resistance performance
Carry out test according to 7.1.3.4. The pressure assistant flush tank shall not have leakage,
deformation, sweating and any other damage when it is subjected to a static pressure of (3.5±0.2)
MPa.
6.1.3.6 Resistance to cold and heat aging
Carry out test according to 7.1.3.5. The pressure assistant flush tank shall not have surface
cracking, rupture, obvious deformation, etc.
6.1.3.7 Creep resistance
After carrying out the cold and heat aging test according to 7.1.3.5, test according to 7.1.3.6.
After the pressure assistant flush tank is maintained at (1.0±0.1) MPa static pressure for 500h,
there shall be no leakage, deformation, sweating or any other damage.
6.1.3.8 Anti-siphon performance
The pressure assistant flush tank shall have a vacuum breaking device; and the minimum air
intake gap diameter of the air inlet shall be no less than 4mm or the equivalent diameter shall
be no less than 4mm. When testing according to 7.1.3.7, there shall be no siphon.
6.1.3.9 Water hammer
Carry out the test according to Appendix B. When the water inlet is closed or stopped, the
pressure rise value shall not exceed 0.2MPa.
6.1.3.10 Anti-influent failure
Destroy the water inlet control device according to 7.1.3.8; then feed water under a static
pressure of 1.0MPa; keep it for 30 min, and water tank shall not burst or be damaged.
6.1.3.11 Overflow performance
Carry out test according to 7.1.3.9; the overflow capacity of the internally-overflowed pressure
assistant flush tank shall be no less than 20L/min.
6.1.3.12 Discharge pressure
Carry out the test according to 7.1.3.10, and the discharge pressure of the pressure assistant
flush tank shall be no less than 0.02MPa.
6.1.3.13 Lifespan
After 150 000 cycle tests according to 7.1.3.11, the pressure assistant flush tank shall be able
to meet the requirements of 6.1.3.2, 6.1.3.3, 6.1.3.4 and shall not have any other failures.
6.2 Flushometer valve
6.2.1 Working range
The pressure working range of the flushometer valve is (0.10~0.90) MPa static pressure.
6.2.2 Processing and assembly
6.2.2.1 The castings must not have defects such as shrinkage cavities, cracks and pores; and the
core sand attached to the inner cavity shall be removed.
6.2.2.2 There shall be no obvious defects such as dents and broken teeth on the thread surface;
and the surface roughness Rα shall be no greater than 3.2μm.
6.2.2.3 For metal parts that cooperate with rubber seals, the surface roughness Rα is no greater
than 3.2μm.
Working environment temperature: (1~55)℃.
Working medium: water.
Working water temperature: no more than 45°C.
Ambient relative humidity (RH): no more than 93%.
Working static pressure: no less than 0.05MPa, no more than 0.6MPa.
6.3.2 Processing and assembly
6.3.2.1 The castings shall be free from defects such as shrinkage cavities, cracks and pores, and
the core sand attached to the inner cavity shall be removed.
6.3.2.2 There shall be no obvious defects such as dents and broken teeth on the thread surface,
and the surface roughness Rα shall be no greater than 3.2μm.
6.3.2.3 The surface roughness Rα of metal parts that cooperate with rubber seals shall be no
greater than 3.2μm.
6.3.2.4 There shall be no obvious filling spots, ripples, flashes, sink marks, warping and welding
marks on the surface of plastic parts. There shall be no visible scrapes, scratches, trim damage
and dirt.
6.3.2.5 There shall be no sharp edges and corners or other hidden dangers that may cause
personal injury to the surface of the product.
6.3.3 Surface quality
6.3.3.1 The exposed surface coating and plating layer after installation shall be well bonded,
the surface shall be smooth, and the color and luster should be uniform.
6.3.3.2 The exposed polished outer surface after installation shall be bright, and there shall be
no defects such as blistering, detachment, and scratches.
6.3.3.3 The exposed metal coating after installation shall meet the requirements of Level-10 in
GB/T 6461-2002 after the 24h acid salt spray test according to GB/T 10125-1997.
6.3.3.4 After the test for adhesion of the exposed sprayed coating after installation according to
GB/T 9286-1998, there shall be no peeling phenomenon on the surface of the sprayed coating.
6.3.4 Dimensional properties
The precision of pipe thread shall comply with the provisions of GB/T 7306.1 or GB/T 7306.2
or GB/T 7307; and the external thread according to GB/T 7307 shall be no lower than the Level-
B precision.
6.3.16.1 After taking high temperature test according to 7.3.12.1, the requirements of 6.3.6,
6.3.11 and 6.3.12 shall be met.
6.3.16.2 After taking low temperature test according to 7.3.12.2, the requirements of 6.3.6,
6.3.11 and 6.3.12 shall be met.
6.3.17 Humidity test
After testing according to 7.3.13, the requirements of 6.3.6, 6.3.11 and 6.3.12 shall be met.
6.3.18 Battery box performance
Carry out the test according to 7.3.14. For battery-powered products, the battery shall be placed
in an independently sealed battery box. The battery shall be easily replaced. After the battery
has been replaced more than 3 times, the battery box shall not be damaged, and the screws shall
not be loosened. After the humidity test in 6.3.17, the metal parts in the battery box shall not be
rusted.
6.3.19 Lifespan test
Carry out test according to 7.3.15. After 200 000 life cycle tests, the requirements of 6.3.6,
6.3.11, and 6.3.12 shall be met.
7 Test Methods
7.1 Test method for pressure assistant flush tank
7.1.1 General requirements
7.1.1.1 Installation and maintenance
Simulate the installation and disassembly of the various parts of the pressure assistant flush
tank, and conduct the test by hand feeling. It shall be possible to use standard tools for
replacement and maintenance.
7.1.1.2 Operating force
The tensile load and fixed load of the chain or traction wire driven by the wrench are measured
by a dynamometer or a weight corresponding to the force value.
7.1.1.3 Water supply connection thread
7.1.1.3.1 The thread accuracy shall be measured by the thread gauge used to measure the
accuracy level.
7.1.1.3.2 The tensile performance and torque resistance performance of connecting threads
shall be carried out according to Appendix A.
7.1.3.1 Influent flow rate test
Install the pressure assistant flush tank on the testing equipment according to the state of use;
connect the water inlet to the water supply device of the equipment; adjust the dynamic pressure
of the influent to (0.10±0.01) MPa; make the pressure assistant flush tank supply water to the
natural closed state; and open the drainage device to make the water tank drain and close
naturally. At the same time, use a stopwatch to test the time from opening the drain valve to the
closing of influent. Use a flow meter or other instruments that can obtain the same result to
measure the amount of water entering the pressure assistant flush tank. If there is water
replenishment, the water volume entering into the pressure assistant flush tank shall include the
water replenishment volume. Divide the influent volume by the water inflow time to get the
influent flow rate; test three times; and take the arithmetic average.
7.1.3.2 Influent stability test
Influent stability at static pressure: Install the pressure assistant flush tank according to the use
state; feed water under static pressure (0.10±0.01) MPa until it is completely closed; keep for 5
min; drain until the drainage is automatically closed; record the total discharging amount T0.
Re-feed water at static pressure (0.10±0.01) MPa until the influent is completely closed; and
keep it for 5 min; then increase the static pressure to (0.30±0.03) MPa; keep it for 5 min; drain
until the drainage is automatically closed; and record the total discharging amount T1. Adjust
the static pressure to (0.10±0.01) MPa, and then enter the water until the influent is completely
closed; and keep it for 5 min; increase the static pressure to (1.0±0.05) MPa; keep it for 5 min;
drain until the drainage is automatically closed; and record the total discharging amount T2.
Calculate the change value of water volume (L): TJ=T2-T0 and TJ=T1-T0, take the maximum
value of the absolute value of the two.
Influent stability at dynamic pressure: Install the pressure assistant flush tank according to the
state of use; enter the water under the dynamic pressure (0.10±0.02) MPa until the influent is
completely closed; keep for 5 min; drain until the drainage is automatically closed; record the
total discharging amount T0. Enter the water under the dynamic pressure of (0.30±0.03) MPa
until the influent is completely closed; keep for 5 min; drain until the drainage is automatically
closed; record the total discharging amount T1. Feed water under the dynamic pressure of
0.60±0.05) MPa until the influent is completely closed; keep for 5 min; drain until the drainage
is automatically closed; record the total discharging amount T2. Calculate the change value of
water volume (L): Td=T2-T0 and Td=T1-T0, take the maximum value of the absolute value of the
two.
If there is water replenishment, the total water volume shall include the discharge water volume
and the water replenishment volume from when the drainage device is turned on to when the
influent is completely closed.
7.1.3.3 Sealing performance test
Sealing at static pressure: Install the pressure assistant flush tank on the testing equipment
according to the state of use; connect the water inlet to the water supply device of the equipment;
adjust the static pressure of the influent to (0.10±0.01) MPa; and make the pressure assistant
flush tank feed water to the naturally closed state; keep it for 5min; check whether there is any
leakage in the water outlet and various parts of the product. Then adjust the static pressure of
the influent to (1.0±0.05) MPa; keep it for 5 min; and check whether there is leakage in the
water outlet and various parts of the product. Repeat three times in the order of first low pressure
and then high pressure; and record the inspection results.
Sealing at dynamic pressure: Install the pressure assistant flush tank on the test equipment
according to the state of use; connect the water inlet to the water supply device of the equipment;
adjust the dynamic pressure of influent to (0.10±0.02) MPa; make the pressure assistant flush
tank feed water to the naturally closed state; and keep it for 5 min; check whether there is any
leakage in the water outlet and various parts of the product. Then adjust the dynamic pressure
of the influent to (0.60±0.05) MPa; keep it for 5 min; and check whether there is leakage in the
water outlet and various parts of the product. Repeat three times in the order of first low pressure
and then high pressure; and record the inspection results.
7.1.3.4 Pressure resistance test
Install the pressure flushing water tank on the test equipment according to the state of use,
connect the water inlet to the water supply device of the equipment, let the pressure flushing
water tank enter the natural closed state under the water inlet dynamic pressure not less than
(0.10±0.02) MPa, adjust the water inlet static The pressure is (3.5±0.1) MPa, keep it for 5 min,
and check whether the product has leakage, deformation, sweating and any other damage.
Products that have passed the withstand voltage test cannot be used for other tests.
7.1.3.5 Resistance to cold and heat aging test
Open the water outlet, water inlet, check valve and all non-sealed connections leading to the
interior of the water tank to the maximum position; put them into the freezer; adjust the
temperature to -5°C and keep it for 24h. After taking it out, check whether there are plastic parts
cracked or seriously deformed on the outer surface of the product. If there is, the test shall be
terminated. If there is not, after standing at the room temperature for 24h, continuously place it
in the 70°C thermotank for 168h; take it out, and after cooling off at the room temperature,
check whether there are plastic parts cracked or seriously deformed on the outer surface of the
product. If there is, terminate the test. If there is not, place it at room temperature for 24h.
Perform 10 000 cycle tests under static pressure no less than 0.62MPa, and dynamic pressure
no less than 0.48MPa to check whether there are leakage and abnormal phenomena in each part
of the product; and whether the water intaking and draining functions are normal.
7.1.3.6 Creep resistance test
According to 7.1.3.5, the pressure assistant flush tank shall be subjected to cold and heat aging
treatment first, and then shall be kept under (1.0±0.05) MPa static pressure for 500h. During
this process, observe whether there is any leakage, deformation, sweating and any other damage
phenomena.
Key:
1 – pressure regulator;
2 – flowmeter;
3 – DN40 ball valve;
4 – DN32 ball valve;
5 - galvanized straight pipe of the same diameter as the water inlet of flushing valve;
6 - galvanized elbow, internal thread - internal thread;
7 - Galvanized elbow, external thread - internal thread;
8 – pressure gauge;
9 – test sample;
10 – water tank;
11 – electronic display and record device.
NOTE 1: This waterway includes three 180° elbows, two 90° elbows and six sections of straight pipe;
and an exhaust system is installed on the top. The total length of the pipeline between point B and point
C shall be no less than 20m; and the length of each straight pipe shall be no less than 1m.
NOTE 2: Close the water path of ball valve 4 and open the water path of the ball valve 3, which can be
used for testing the sealing performance, strength performance, flushing water consumption, and
operation performance. Close the water path of ball valve 3 and open the water path of the ball valve 4,
which can be used for testing the water hammer performance.
Figure 3 – Schematic Diagram of Test System
Connect the product to the water supply system; conduct a sealing test on each part of the
product according to the provisions in Table 1, and the valve core state, water outlet state, test
pressure and retention time shall be performed according to Table 1. During the entire test
process, check the valve core, upper water level of valve body, and lower water level of valve
body, respectively to see whether there is any leakage.
7.2.4.2 Strength performance test
Install the product on the testing equipment according to the state of use or the manufacturer’s
instructions. The testing equipment shall be equipped with a water supply system that can
provide and maintain the static pressure and dynamic pressure specified in Table 2. The test
system is shown in Figure 3. Other systems that can achieve the same effect can also be used.
Water temperature is ≤30°C.
Connect the product to the water supply system; and carry out the strength test on each part of
the product according to the provisions in Table 2. The state of the valve core, the state of the
water outlet, the test pressure and the retention time shall be performed according to Table 2.
During the whole test process, check each component on the upper water level and lower water
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
|