Skip to product information
1 of 12

PayPal, credit cards. Download editable-PDF and invoice in 1 second!

GB/T 26750-2011 English PDF (GBT26750-2011)

GB/T 26750-2011 English PDF (GBT26750-2011)

Regular price $620.00 USD
Regular price Sale price $620.00 USD
Sale Sold out
Shipping calculated at checkout.
Quotation: In 1-minute, 24-hr self-service. Click here GB/T 26750-2011 to get it for Purchase Approval, Bank TT...

GB/T 26750-2011: Sanitary ware -- Pressure assistant water flushing devices

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.
GB/T 26750-2011
GB
NATIONAL STANDARD OF THE
PEOPLE 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 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 R?? shall be no greater than 3.2??m.
6.2.2.3 For metal parts that cooperate with rubber seals, the surface roughness R?? is no greater than 3.2??m.
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 R?? shall be no greater than 3.2??m.
6.3.2.3 The surface roughness R?? of metal parts that cooperate with rubber seals shall be no greater than 3.2??m.
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 pa...

View full details