QB/T 2278.2-1996 Self-priming solenoid valve for household gas instantaneous water heaters
Some standard content:
QB/T 2278.2—1996
This standard is used as the component standard of GB6932 "Household Gas Instantaneous Water Heaters". This standard is proposed by the Quality Standards Department of China Light Industry Association. This standard is under the jurisdiction of the National Daily Hardware Standardization Center. The responsible drafting unit of this standard: Guangdong Petroleum Gas Appliance Development Co., Ltd.; participating drafting units: Shenyang Light Industry Research and Design Institute, Cixi Gas Safety Appliance Factory, Guangdong Shenzhou Gas Appliance Co., Ltd. The main drafters of this standard: Li Bing, Lv Fu, Li Yang, Sheng Shuixiang, Zhong Hongji. 571
1 Scope
Light Industry Standard of the People's Republic of China
Household Gas Instantaneous Water Heater
Self-priming Solenoid Valve
QB/T 2278.2--- 1996
This standard specifies the definition, model and basic parameters, technical requirements, test methods and marking, and packaging of self-priming solenoid valves for household gas instantaneous water heaters with a rated voltage of dc3V. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB191--1990 Pictorial Marking for Packaging Storage and Transportation
GB/T2829--1987 Periodic Inspection Count Sampling Procedure and Sampling Table (Applicable to the Inspection of Production Process Stability) 3 Definitions
This standard adopts the following definitions.
3.1 Valve opening action voltage (Ub)
When the ambient temperature is 20℃ and the gas pressure is 5kPa, a pulse voltage with a certain amplitude of 200ms is applied to the self-priming solenoid valve action coil, and a pulse voltage with a certain amplitude is applied to the holding coil, so that the self-priming solenoid valve can automatically close to the valve opening state. The minimum value of the pulse voltage is the valve opening action voltage Un. 3.2 Valve opening holding voltage (UB)
When the ambient temperature is 30℃, a pulse voltage with an amplitude greater than Up and a pulse width of 200ms is applied to the action coil, so that the self-priming solenoid valve is in the closed state, and a certain amplitude voltage is applied to the holding coil to keep it closed. The minimum value of the voltage is the valve opening holding voltage Uh.
3.3 Release voltage (Us)
When the self-priming solenoid valve is in a certain energized state, the power supply of the action coil is cut off, and when the voltage of the holding coil gradually decreases from a large value to a certain value, the self-priming solenoid valve is released and the valve is closed. The voltage at both ends of the holding coil is the release voltage Us. 4 Models and basic parameters
4.1 Model
The product model is indicated by the self-priming solenoid valve code ZD, working stroke code, valve installation depth code, modification code and standard number. See Table 1 and Table 2.
Table 1 Comparison table of working stroke code and actual size 13
(1.3±0.2)mmwww.bzxz.net
Approved by China Light Industry Association on 1997-01-27
(2.0±0.2)mm
(2.5±0.2)mm
Implemented on 1997-09-01
(14.5±0. 05)mm
Marking example:
QB/T 2278.2 --- 1996
Table 2 Comparison between valve depth code and actual size Table 2
(16.0±0.05)mm
Standard number
Remodel code (A, BC)
-Valve depth code (1, 2.3)
-Working stroke code (2 digits)
(26.5±0.05)mm
ZD131-AQB/T2278.2: Working stroke is 1.3mm, valve depth is 14.5mm, A type self-priming solenoid valve. 4.2 Basic parameters
4.2.1 Applicable gas types: artificial gas, natural gas, liquefied petroleum gas. 4.2.2 Rated voltage: dc3V.
4.2.3 Stroke
The stroke of ZD13 is: 1.3±0.2)mm [Valve fixing depth (14.5±0.05)mm]. The stroke of ZD20 is: (2.0±0.2)mm
Valve fixing depth (16.0±0.05)mm
The stroke of ZD25 is: (2.5±0.2)mmValve fixing depth (16.0±0.05)mm). 4.2.4 Sealing diameter
The sealing diameter of ZD13 is: $8mm. The sealing diameter of ZD20 is: $10mm. The sealing diameter of ZD25 is: Φ17mm.
4.2.5 Valve sealing force
The valve sealing force of ZD13 is: 785mN±10% (80gf±10%). The valve sealing force of ZD20 is: 686mN±10% (70gf±10%). The valve sealing force of ZD25 is: 1343mN±10% (140gf±10%). 4.2.6 Operating pressure: below 5kPa.
Allowable pressure limit: below 0.03MPa.
Operating temperature: -20～+60℃ (no freezing state). 4.2.8
4.2.9 Operating humidity: 35%～90%RH (no frost state). 4.2.10
Storage temperature: 25～+80℃.
Storage humidity: 25%~95%RH.
Installation direction: within 5° horizontally. Insulation grade: Class A (105°C).
5 Technical requirements
Action coil resistance Rn
Rp value of ZD13: 70±10%.
Rp value of ZD20: 60±10%
Rp value of ZD25: 3.70±10%
5.2 Holding coil resistance RB
RB value of ZD13: 6000±10%
RB value of ZD20: 6000Q
2z225 R, value is 5700%.
5.3 Comprehensive resistance Rz
QB/T 2278.2-1996
Rz=（Rp+R）±1%（where RD and Re are measured values） 5.4 Valve opening action voltage Up
ZD13: dc 1. 6V or less.
ZD20: dc1.7V or less.
ZD25: dc1.8V or less.
5.5 Valve opening holding voltage UB
Valve opening holding voltage UB: dc2.2V or less. 5.6 Release voltage Us
Release voltage Us: dc1V or more.
5.7 Air tightness
5.7.1 Internal air tightness: When the self-priming solenoid valve is in the closed valve state and the pressure is 4.2kPa from the air intake side, the leakage should be less than 0.07L/h. 5.7.2 External air tightness: When the self-priming solenoid valve is in the suction valve state and the pressure is 4.2kPa from the air intake side, there is no leakage. 5.8 Insulation resistance
The insulation resistance between the coil and the metal frame is not less than 5Ma. 5.9 Moisture resistance
After being placed in a humid environment, the insulation resistance is not less than 1Mα. 5.10 Durability
5.10.1 Normal temperature durability: At normal temperature, after repeated 300,000 tests, it meets 5.4~~5.8. 5.10.2 Temperature cycle durability: After 300,000 tests at different temperatures, it meets 5.4~5.8. 5.11 Gas resistance (seals)
In addition to meeting the requirements for sealing performance, the sealing material shall also be resistant to gas corrosion and meet the requirements of 5.11.1~5.11.2. 5.11.1 No embrittlement, softening, or hardening.
5.11.2 Volume change rate is within 10%.
5.12 Noise
Noise when valve is opened ≤55dB(A); Noise when valve is closed ≤55dB(A). 5.13 Heat resistance
After the self-priming solenoid valve is placed in a high temperature environment, it shall meet the requirements of 5.4~5.8, and the parts shall not have any abnormal conditions such as cracks, looseness, expansion, or deformation.
5.14 Cold resistance
After the self-priming solenoid valve is placed in a cold environment, it shall meet the requirements of 5.4~5.8, and the parts shall not have any abnormal conditions such as cracks, looseness, expansion, or deformation.
5.15 Thermal Cycle
After repeated placement in cold and hot environments, the requirements of 5.4 to 5.8 shall be met, and the parts shall be free of abnormal conditions such as cracks, relaxation, expansion, and deformation. 574
5.16 Vibration Resistance
QB/T 2278.2
After the moving test, the requirements of 5.4 to 5.8 shall be met, and the parts shall be free of abnormal conditions such as cracks, relaxation, expansion, and deformation. 5.17 Vibration resistance
During the vibration test, the self-priming solenoid valve does not fall off the valve. 5.18 Pulling strength
The self-priming solenoid valve wire does not loosen or break during the pull-out test. 5.19 Impact resistance
After the impact test, the self-priming solenoid valve meets 5.4~5.8. 5.20 Temperature rise test
5.20.1d.c.3V is continuously added to the action line, the saturated temperature rise of the action line circle does not exceed 25℃, and the saturated temperature rise of the winding frame does not exceed 15C.
5.20.2d.c.3.3V is continuously added to the holding coil, the saturated temperature rise of the holding coil does not exceed 10℃, and the saturated temperature rise of the winding frame does not exceed 10℃.
6 Test method
6.1 Sampling
6.1.1 Each product shall be inspected for the following items before leaving the factory: a. Appearance; b. Action coil resistance, holding coil resistance, comprehensive resistance: c. Valve opening action voltage, valve opening holding voltage, release voltage; air tightness; e. Stroke.
6.1.2 Type inspection: Type inspection shall be carried out for the following situations. b. Trial type identification of new products or old products transferred to the factory for production; b. After formal production, if there are major changes in structure, materials, and processes that may affect product performance, an inspection shall be carried out once a year during normal production; e. When the product is stopped for a long time and the production tree is resumed, e. When the results of the factory inspection are significantly different from those of the last type inspection; f. When the national quality supervision agency proposes a type inspection requirement. 6.1.3 Type inspection sampling conditions, methods and sample storage shall be carried out in accordance with GB/T2829, and a secondary sampling plan with discrimination level 1 shall be adopted. The batch quality shall be calculated based on the number of defective products per 100 units of products, and the sample size shall be n1 to n25. The unqualified quality level (RQL) is 65 for Class C, 50 for Class B and 20 for Class A. The inspection items are shown in Table 3.
Inspection items
Release voltage
External tightness
Valve opening action voltage
Valve opening holding voltage
Internal air tightness
Flame resistance
No classification
Table 3 Type inspection items
Corresponding models
Sample size
Qualified quality level (RQL)
Inspection items|| tt||Heat resistance
Cold resistance
Thermal cycle
Vibration resistance
Vibration holding
Pulling strength
Impact resistance
Action coil resistance
Holding coil resistance
Total resistance
Insulation resistance
Moisture resistance
Overflow durability
Temperature cycle durability
QB/T 2278.2--- 1996
Continued Table 3
Not including classification
Corresponding clauses
Discrimination level
Sample size
n,= n2 5
Rejection quality level (RQI)
Note: Items 13, 19, and 20 should be tested on different samples respectively. If the sample is not enough, additional samples can be drawn. Test environment temperature (20 ± 5) C.
Test instruments and equipment are shown in Table 4.
Table 4 Test instruments and equipment
Test items
Gas leakage
Thermometer
Hygrometer
Surface thermometer
U-shaped pressure gauge
Digital multimeter
Leak detector
Sound level meter
Note: All instruments should be calibrated according to relevant regulations before use. 6.2 Test items Country
0～50℃
0～10000Pa
0~10mm
40~120dB
Minimum scale
6.2.1 Action coil resistance, holding coil resistance, comprehensive resistance: Use a digital multimeter to detect the action coil resistance Rp, holding coil resistance Rr, and comprehensive resistance Rz.
6.2.2 Valve opening action voltage detection: Place the self-priming solenoid valve horizontally on the inspection fixture as shown in Figure 1 and clamp it, input 5kPa air pressure from the air inlet, start the program-controlled power supply, apply a pulse voltage with a width of 200ms to the self-priming valve (the voltage starts from 2V and automatically decreases by 0.05V each time), and at the same time apply a pulse voltage to the self-priming valve holding coil. The upper limit holding voltage of the valve opening action voltage specified in Article 5.4 is applied to the self-priming valve holding coil. At this time, the self-priming valve starts, and the liquid level of the U-type pressure gauge drops. If the liquid level of the U-type pressure gauge does not change, the voltage value displayed last time is the valve opening action voltage of the self-priming valve. Voltage display
Programmed power supply
Clamping cylinder
Self-priming valve
Compressed air 5kPal
Open valve indicator
Air outlet
Air inlet
Close valve indicator
U-type pressure gauge
Water column height corresponds to
Medical compressed air
6.2.3 Open valve holding voltage detection: Place the solenoid valve horizontally on the test fixture so that its action stroke meets the requirements, start the program-controlled power supply to apply a DC voltage of -10V to the holding coil (the voltage starts from 2.5V and automatically decreases). At the same time as the holding voltage is applied, a pulse signal with a width of 200ms and an amplitude of 1.8V is applied to the action coil, so that the solenoid valve is fully attracted and enters the holding state. At this time, observe the action of the solenoid valve. When the solenoid valve enters the closed valve reset state, the voltage value indicated by the power supply before is the open valve holding voltage of the self-priming solenoid valve. 6.2.4 Release voltage detection: Place the solenoid valve horizontally on a special test fixture so that its action stroke meets the requirements, apply a DC voltage of (3.4±0.1)V to the holding coil, and apply a pulse signal with a width of 300ms and an amplitude of (3.0±0.1)V to the action coil, so that the solenoid valve is fully attracted and enters the holding state. At this time, the holding voltage is quickly reduced to a certain value, and the above steps are repeated to observe the action of the solenoid valve. The highest value of the solenoid valve entering the closed valve reset state within 700ms is the release voltage of the self-priming solenoid valve. 6.2.5 Air tightness
6.2.5.1 Internal air tightness: Place the self-priming medium magnetic valve on the inspection fixture as shown in Figure 2 and clamp it in the closed valve state. Add 4.2kPa compressed air from the air inlet side, and close the valve after the water column liquid level is stable. The leakage should be less than 0.07L/h. Self-priming solenoid valve
Outlet side spread
Inlet side
Valve
Air pressure
1000mm water column
6.2.5.2 External air tightness Place the self-priming solenoid valve on the inspection fixture as shown in Figure 3 and clamp it. Power on and put it in the open valve state. Add 10kPa air pressure from the inlet side and close the valve after the water column liquid level stabilizes. The liquid level of the U-shaped pressure gauge should not drop within 1 minute. 577
Self-priming solenoid valve
QB/T 2278.2-1996
1000mm water column
Inlet side
Outlet side closed
Air pressure
6.2.6 Insulation resistance: The insulation resistance between the coil and the metal frame tested by dc500V megohmmeter should be no less than 5M2. 6.2.7 Moisture resistance: After being placed in an environment with a temperature of (40±2)C and a relative humidity of 90%~95%RH for 72h, the insulation resistance measured by dc500V megohmmeter should be no less than 1MQ.
6.2.8 Durability
6.2.8.1 Normal temperature durability: Apply dc3V voltage to the action coil and the holding coil, supply 5kPa compressed air from the air intake side, and make a cycle of 1s on and 1s off. Repeat this process 300,000 times and meet the requirements of 5.4~5.8. 6:2.8.2 Temperature cycle durability: Apply dc3V voltage to the action coil and the holding coil, supply 5kPa air pressure from the air intake side, and make a cycle of 0.5s on and 0.5s off. After the test is completed under the following conditions, return to normal temperature for 1~2h and meet the requirements of 5.4~5.8. (—20±3)℃
(+60±3)℃
100,000 times
100,000 times
Total 300,000 times
100,000 times
(-20±3)℃
6.2.9 Combustion gas resistance (seals): At room temperature, immerse in n-pentane for 72 hours, take it out and place it in the air for 24 hours, and meet 5.11.1~5.11.2.
6.2.10 Noise: Add dc3V voltage to the action coil and the holding coil, and measure the noise with a sound level meter at a horizontal distance of 1m from the self-priming solenoid valve under test.
6.11 Heat resistance: After being placed in an environment with a temperature of (80 ± 3) °C for 48 hours, return to room temperature for 1~2 hours, and meet the requirements of Article 5.13. 6.2.12 Cold resistance: After being placed in an environment with a temperature of (-~25 ± 3) °C for 48 hours, return to room temperature for 1~2 hours, and meet the requirements of Article 5.14. 6.2.13 Thermal cycle: After being placed in an environment with a temperature of (-20 ± 3) °C for 1 hour, place it in an environment with a temperature of (80 ± 3) °C (relative humidity 65% ± 20% RH) for another 1 hour, and take this as a cycle. After 10 cycles of testing, return to room temperature for 1~2 hours, and meet the requirements of Article 5.15. 6.2.14 Vibration resistance: Vibration frequency is 10Hz, amplitude is 5mm, and the X, Y, and Z directions are each tested for 60 minutes, and meet the requirements of Article 5.16. 6.2.15 Vibration resistance: Add dc1.8V, 200ms pulse voltage to the action coil, and add dc2.2V voltage to the holding coil. At this time, 1.5g, 10Hz sine wave vibration in the horizontal direction, keep the valve for 1 minute without falling, which should meet the requirements of Article 5.17. : 6.2.16 Pull-out strength: Add 20N force to each wire in the wire outlet direction, and apply force for more than 1 minute. 6.2.17 Impact resistance: Install the self-priming solenoid valve on the valve body, and let it fall freely from a height of 30cm to the concrete surface. It should meet the requirements of Article 5.19.
Note: Except for injuries that do not damage the wire and function. 6.2.18 Temperature rise: Continuously add dc3V voltage to the coil, and measure its temperature rise with a surface thermometer. 7 Marking, packaging, transportation and storage
7.1 Marking
Each self-priming solenoid valve shall be equipped with a standard nameplate at an appropriate location to indicate the following matters. Model of self-priming solenoid valve;
Rated voltage;
Manufacturer’s name;
QB/T2278.2—1996
Manufacturing date (or number) or production batch number. 7.2 Packaging
7.2.1 The product shall be packed in a box. The product certificates shall be complete in the box. 7.2.2 During transportation, the packaged items shall be protected from severe vibration, extrusion, rain and corrosion by chemicals. They shall be handled with care and neatly stacked. Rolling and throwing are strictly prohibited.
7.2.3 The packaged items shall be stored in a dry and ventilated warehouse without corrosive gases. 579
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