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Engineering Construction Standard Full Text Information System
Town Construction Industry Standard of the People's Republic of China CJ/T3072—1998
Cock assembly for domestic gas appliance
Cock assembly for domestic gas applianceConstruction Standard
1998-11-13Release
Engineering Construction Standard Full Text Information System
Release by the Ministry of Construction of the People's Republic of China
1999-03-01Implementation
Engineering Construction Standard Full Text Information System
3072—1998
Foreword·
Cited Standards
Technical Requirements
Test Methods
Inspection Rules
Marking, Packaging, Transportation and Purchase and Storage.
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Engineering Construction Standard Full Text Information System
CJ/T3072-1998
During the formulation of this standard, JISS2150-93 "Manual Control Valve for Gas Appliances", JISS2120-92 "Gas Cock Valve" and JISS2151-93 "Automatic Valve for Gas Appliances" standards were adopted as reference. The main technical contents and indicators are equivalent to the above standards. The object of this standard is the plug valve assembly of household gas appliances, that is, the control device with plug valve as the main body and different additional devices. Compared with Japan's JISS2150, additional devices suitable for national conditions are added. Non-plug valve content in the Japanese standard is not included. This standard was proposed by the Standard and Quota Research Institute of the Ministry of Construction. This standard is under the jurisdiction of China Municipal Engineering North China Design Institute, the technical unit responsible for urban gas standards of the Ministry of Construction. This standard was drafted by Tianjin University, China Municipal Engineering North China Design Institute, Guangdong Petroleum Gas Appliance Development Co., Ltd., Guangdong Changqing Group Co., Ltd., and Cixi Gas Safety Appliance Factory. The main drafters of this standard are: Jin Zhigang, Du Ying, Li Wentian, Jin Shijian, Gao Yong, Li Ping, He Qiqiang, and Lv Fu. Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Urban Construction Industry Standard of the People's Republic of China Cock Assembly for Domestic Gas Appliances
Cock assemblyfor domestic gas appliance1 Scope
CJ/T3072—1998
This standard specifies the main performance and structural requirements of the cock assembly for domestic gas appliances (referred to as the valve assembly) and the test method for evaluating its performance.
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 are subject to revision, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T 2828—1987
GB/T2929—1987
Batch-by-batch inspection counting sampling procedures and sampling tables (applicable to inspection of continuous batches) Periodic inspection counting sampling procedures and sampling tables (applicable to inspection of production process stability) 4 Domestic gas instantaneous water heaters
GB/6932—1994
GB/T7306—1987
GB/T7307—1987
GB/T8733—1988
GB/T12203—1990
GB/T13611-1992||t t||GB/T16410—1996
GB/T16411-1996
3 Definitions
Pipe threads sealed with threads
Pipe threads not sealed with threads
Casting gold-aluminum alloy ingots
Flame-out protection device for thermoelectric burners
City gas classification
Household gas stoves
General test methods for household gas appliances3.1 Plug valve assembly for household gas appliances
The plug valve is the main body, and according to the special functional requirements of applicable household gas appliances, it is equipped with corresponding additional devices to form an integrated control device.
3.2 Additional devices
Additional devices refer to devices such as electric ignition, flameout protection, gas pressure regulator, thermostat, etc. that have functions that meet the special requirements of household gas appliances.
4 Classification
4.1 The plug valve assembly of household gas appliances can be classified according to the type of applicable gas appliances, gas categories, etc. 4.1.1 According to the type of gas appliances, it can be divided into household stove valve assembly, water heater valve assembly, etc. 4.1.2 According to the type of gas, it can be divided into artificial gas, natural gas and liquefied petroleum gas valve assembly. 4.2 Model of valve assembly
4.2.1 Model compilation
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Code and gas appliances
Gas category
Ignition method and additional device valve assembly heat flow modification design number
4.2.2 The valve assembly is represented by the Chinese pinyin letter F, and is represented by the following pinyin letters in combination with the gas appliance: FJZ-
stove valve assembly; FJK-
-oven valve assembly; FJF-
instant water heater valve assembly, FCH-
-rice cooker valve assembly:
normal pressure positive displacement water heater valve assembly.
4.2.3 According to the type of gas, the following Chinese phonetic letters are used to represent: R
man-made coal gas T
natural gas Y
liquid petroleum gas;
4.2.4 The heat flow (heat load) of the valve assembly can be expressed in the following three ways: 4.2.4.1 For the valve assembly of domestic gas stoves, it can be expressed by the angle, number, position and diameter of the nozzle. a) The nozzle angle is measured by the angle between the nozzle axis and the vertical plane of the plug axis. 0 means that the nozzle axis is parallel to the plug axis. b) The number of nozzles is represented by the following phonetic letters: D - single; S - double.
c) The position of the nozzle refers to the relative position of the main nozzle on the vertical center line of the plug, which is expressed in pinyin: Y - right; Z - left; L - double.
d) The diameter refers to the maximum hole diameter on the plug core, which is expressed in lowercase Arabic numerals in millimeters. 4.2.4.2 For instantaneous water heaters, the hot water production rate of the valve assembly can be used, such as 5L/min can be represented by 05. 4.2.4.3 For volumetric water heaters, the heat flow rate of the valve assembly can be represented by the lowercase Arabic numerals of the kW number. 4.2.5 Additional devices are represented by phonetic letters: C—piezoelectric ceramic igniter; Dm—electric pulse igniter Ai—thermocouple flameout safety protection device; A2—oxygen deficiency safety protection device (or CO over-limit protection device); M—diaphragm pressure regulating valve; W—thermostat; T
—push rod flow regulator; Sh—timer; Q—piano key adjustment. Example 1
FJZYCA,30SZ6—
Remodel design number
30° angle, double nozzle, left side, diameter 6mm piezoelectric ceramic ignition, thermocouple flameout safety protection device liquefied petroleum gas
Household stove plug valve assembly
FJST·DA05
Remodel design number
-5L/min
Pulse ignition and thermocouple flameout protection
Natural gas
Instantaneous water heater plug valve assembly||tt ||5 Technical requirements
5.1 The rated gas pressure before the valve assembly shall be selected according to Table 1 Engineering Construction Standard Full Text Information System
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6T, 4T, 5R, 6R, 7R; artificial gas 10T, 12T, 13T; natural gas
19Y, 20Y, 22Y, liquefied petroleum gas
5.2 Performance requirements
5.2.1 Air tightness
Table 1 Gas rated pressure table
Rated pressure, P.
5.2.1.1 The internal leakage and external leakage of the plug valve body shall be less than 0.03L/h under 4.2kPa air pressure. 5.2.1.2 The internal leakage and external leakage of the stop valve other than the plug valve body shall be less than 0.3L/h under 4.2kPa air pressure. 5.2.2 Multi-nozzle flow deviation
Under rated pressure, the difference between the measured flow of the assembly nozzle when all nozzles are working and the sum of the measured flow of each nozzle (or nozzle group) working alone under the same conditions should be less than 8%. The calculation formula is shown in formula (1). Difference = Sum of the measured flow of each nozzle working alone - Measured flow of all nozzles working Measured flow of all nozzles working
5.2.3 Operating torque
The measured operating torque of the valve assembly should be less than the data provided by the manufacturer. 5.2.4 Limit device strength
Under the action of 5 times the operating torque provided by the manufacturer, the limit device should not be deformed or damaged. 5.2.5 Threaded screw-in resistance
*****(1)
For the plug valve body that is screwed in with threads, the threaded screw-in resistance test shall be carried out in accordance with the requirements of Section 6.8 of this standard and meet the requirements of 5.2.1. 5.2.6 Static load resistance
For the plug valve body connected by thread, the static load resistance test shall be carried out in accordance with the requirements of Section 6.9 of this standard and meet the requirements of Section 5.2.1. 5.2.7 Combustion gas resistance of materials
5.2.7.1 After the rubber plastic gasket and diaphragm
are immersed in the cyclopentane fluid for 72 hours, the mass change rate shall be within 20%, and there shall be no embrittlement, softening and swelling that hinders the use. 5.2.7.2 For rubber sealing gaskets and valve pads
When the compression thickness reaches 80%, under the test conditions of Sections 6.11.1 and 6.11.2 of this standard, the butane leakage shall be less than 0.005g/h.
5.2.7.3 Lubricating grease
When the pressure is 5kPa and the temperature is 20℃±1℃, the mass change rate should be less than 10%; when the temperature is 4℃±1℃, the mass change rate should be less than 25%.
5.2.8 Performance of additional devices
5.2.8.1 Each additional device on the valve assembly should have its own national standard (for example, the national standard for thermoelectric flameout protection device is GB/T12203) or other levels of standards. Before connecting with the plug valve body, it must be inspected and qualified according to its own standard requirements before it can be combined with the plug valve to form a valve assembly suitable for various gas appliances. 5.2.8.2 The performance of the valve assembly equipped with various devices should comply with the national standards or other levels of standards for the gas appliances to which the assembly is applicable. For example, the valve assembly of a household instantaneous gas water heater should comply with the requirements of GB6932. When the technical data is insufficient, the following technical requirements can be referred to.
a) The electric igniter shall ignite 10 times continuously, of which the number of ignitions shall not be less than 8 times, and it shall not fail twice in a row. b) The valve opening time of the flameout protection device shall not be greater than 45s, and the valve closing time shall not be greater than 60s. c) When the front pressure of the gas pressure regulating valve is (0.9~1.5) times the rated value, the rear pressure change shall not be greater than 0.05 times the rated pressure plus 30Pa. d) The air tightness of the water-gas linkage valve shall meet the requirements of Section 5.2.1 of this standard. Engineering Construction Standard Full-text Information System
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e) The thermostat shall be able to meet the performance requirements of gas appliances, and the air tightness shall meet the requirements of Section 5.2.1 of this standard (except for electronic control and proportional control valves).
f When the push rod flow valve regulator is fully open, the flow is the maximum flow. When the pull rod is fully closed, the flow should not be greater than 1/3 times the maximum flow. g) The timing range variation of the timer (mechanical type) shall be less than 10%, and the air tightness shall meet the requirements of Section 5.2.1 of this standard. h) The valve closing temperature of the gas cooker controller shall be within the range of the boiling point of water plus (0.5-4.5)°C. 5.2.9 Durability
5.2.9.1 The main body of the plug valve shall meet the requirements of Section 5.2.1 and Section 5.2.3 of this standard after repeated operation 30,000 times under the condition of gas flow.
5.2.9.2 The durability of additional devices shall be determined according to the standard requirements of the applicable gas appliances. When technical data is insufficient, refer to the following table:
Table 2 Number of operations of each additional device
Type of additional device
Electric igniter
Flameout protection device
Gas pressure regulating valve
Water-gas linkage device
Thermostat (except electronic control and proportional control) Push rod flow regulator
Timer (mechanical)
5.2.10 Resistance to low temperature environment
Direct acting
Solenoid valve type
After being placed in an environment of -20℃±2℃ for 24 hours, it shall meet the requirements of Section 5.2.1 and Section 5.2.3 of this standard. 5.2.11 High temperature environment resistance
After being placed in the high temperature environment proposed by the manufacturer for 24 hours, it shall meet the requirements of 5.2.1 and 5.2.3 of this standard. 5.2.12 Vibration resistance
After vibrating for 30 minutes, it shall meet the requirements of 5.2.1 and 5.2.3 of this standard. 5.2.13 Electrical performance
The relevant electrical performance of various additional devices on the assembly shall comply with the standard requirements of various additional devices and gas appliances. 5.3 Structural requirements
5.3.1 The connecting parts of the valve assembly shall be firm and not loose, and can withstand possible mechanical, chemical and thermal effects. The valve assembly shall have self-locking measures when opened. 5.3.2
The valve shall be opened in the counterclockwise direction and closed in the clockwise direction. 5.3.3
The taper of the plug core is 14~1:7. The gap between the core and the valve body caused by wear should be automatically eliminated by elastic parts. 5.3.5 When the plug is closed, the sealing length between the valve core and the valve body should be greater than 2.0mm in both the circumferential direction and the generatrix direction (see Figure 1).
5.3.6 The inlet joint of the valve assembly should be threaded, and the thread should comply with the provisions of GB/T7306 and GB/T7307. When the heat load is less than 42.0MJ/h, a hose connection can be used. The joint form is shown in Figure 2. 5.3.7 The valve assembly should have a limit device when it is in the fully open position, and the strength of the limit device should comply with the requirements of Section 5.2.4 of this standard. 5.3.8 After the valve core and valve body of the plug valve are assembled, the valve core should be able to rotate flexibly, feel evenly, and have no sticking phenomenon. The operating torque should not be greater than the requirements of the manufacturer.
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5.3.9 The surface of the valve assembly should be smooth and free of defects such as spots, burrs, and pores. 5.3.10
Nozzles and additional devices should be able to be removed and installed with ordinary tools. 5.3.11 The nozzle structure type can refer to Figure 3. The air regulating plate should move flexibly, but cannot slide on its own. 5.3.12
5.4 Requirements for materials, parts and processes
5.4.1 The nozzle should be made of corrosion-resistant materials with a melting point of not less than 500℃, and other components should be made of materials with a melting point of not less than 350℃. 5.4.2
The chemical composition of the material and the mechanical properties after forming should comply with the provisions of relevant national standards. Aluminum alloys can refer to GB/T8733 or other relevant standards.
The valve core and valve body can be processed or forged or die-cast. Annealing or aging treatment should be performed after processing. 5.4.3
Load tension and compression tests should be performed on elastic materials, and they should comply with the provisions of relevant national standards. Sealing materials (gaskets, diaphragms, washers, valve pads and lubricating oils) should be made of gas-resistant materials and comply with the requirements of Section 5.2.7 of this standard. The plastic parts used should be sturdy and durable and comply with the provisions of relevant national standards. 6 Test method
Laboratory conditions
The room temperature is 20℃±15℃. During each test, the room temperature fluctuates by less than ±5℃. Determination of room temperature: At a distance of 1m from the valve assembly to be tested, fix the mercury ball of the thermometer at a position roughly equal to the upper end of the assembly, and measure the front, left and right points. The average temperature of the three points is the room temperature. The measuring point should not be affected by heat radiation from external heat sources. 6.2 Test instruments and equipment
6.2.1 The test instruments and equipment are generally selected according to the provisions of Table 3, or other instruments with equal reliability and accuracy can be used. Table 3 Test instruments and equipment
Test items
Gas temperature
Atmospheric pressure
Gas flow
Gas pressure
Gas density
Temperature resistance
Durability
Vibration resistance
Air tightness
Operating torque
Gas resistance of gasket and diaphragm
Gas resistance of rubber sealing ring||t t||Lubricating grease gas resistance
Factory air tightness
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Wet and dry bulb thermometer
Glass thermometer
Moving tank (or fixed tank) mercury
Barometer or box barometer
Wet or dry
Gas flow meter
U-type pressure gauge
Gas relative density meter
High temperature and low Constant temperature box
Durability tester
Vibration tester
Leak detector
Torque wrench
Rubber sealing ring gas resistance device
Sealing material and lubrication
Grease gas resistance device
U-type pressure gauge
0~50℃
0～50℃
81~107kPa
0. 5m*/h,2m2/h,3~20m/h
5000Pa;15000Pa
Amplitude 5mm; Frequency 4Hz
Standard volumetric leak detector
0~10N·m
0~100N·m
100~500N?m
0~100g
Greater than 10kPa
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Accuracy and minimum scale
0.02L,0.2L,0.5L
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6.3 All instruments and test devices shall be calibrated regularly as required (certificates shall be available) and corrected according to the correction values. 6.4 Air tightness test
6.4.1 Internal leakage
Open the gas outlet of the valve assembly or plug valve body, with the valve in the closed state, add air at a pressure of 4.2kPa from the gas inlet, and measure the leakage with a leak detector after stabilizing the pressure, and calculate the hourly leakage equivalent to a temperature of 0℃ and an atmospheric pressure of 101.3kPa. The detection time after stabilizing the pressure shall not be less than 5min. 6.4.2 External leakage
Use an appropriate fixture to block the gas outlet of the valve assembly or plug valve body, with the valve in the open state, and measure the leakage using the method in 6.4.1.
6.5 Multi-nozzle flow deviation test (see Figure 4)Install the valve assembly (or plug valve) with multiple nozzles in the flow test device, and control the air pressure in front of the assembly to be the rated pressure. Measure the flow when the assembly is fully opened (multiple nozzles working simultaneously). Then measure the flow rate of each nozzle working alone, and calculate the difference rate according to Section 5.2.2 of this standard. 6.6 Operating torque test
Use a torque wrench to detect the operating torque required for the valve assembly to change from "closed" to "open". 6.7 Strength test of limit
Use a torque wrench to apply 5 times the operating torque proposed by the manufacturer to the fully open limit device, and check whether the limit device has significant deformation and damage.
6.8 Threaded screw-in test
Apply two drops of lubricating oil to the threaded connection of the plug valve of the valve assembly, and then gently screw it into the steel pipe. Fix the valve of the valve assembly and apply the torsional torque specified in Table 4 to the steel pipe. Check whether the valve body of the valve assembly has deformation, damage and cracks. After removing the steel pipe, check the aroma tightness according to 6.4. Table 4 Torsional torque for thread screwing
Nominal diameter of connecting pipe
Torsion, N·m
(kgf·cm)
15(150)
6.9 Static load resistance test
20(200)
30(300)
35(350)
50(500)
60(600)
Install the plug valve body of the valve assembly according to Figure 5, apply static load according to the load data in Table 5, and check for deformation, damage and cracks after 15 minutes. After removing the steel pipe, check the air tightness according to 6.4. Table 5 Load of static load test
Nominal diameter of connecting pipe
Static pressure, N (kgf)
6.10 Gas resistance test for rubber, plastic gasket and diaphragm10
100(10)
110(11)
Immerse the three samples with pre-measured mass in n-pentane liquid (liquid liquefied petroleum gas can also be used) at a temperature of 5 to 25°C for more than 72 hours. Take out and place in the atmosphere for 24 hours and then measure the mass of the three samples respectively. Calculate the mass change rate according to formula (2). Finally, calculate the average mass change rate of the three samples.
MM.
Where: 4M—mass change rate, %;
Mo—mass before test, g;
M——mass after test, g.
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1—Handle; 2—Valve body, 3—Plug, A—Sealing length of support surface; B—Sealing length in generatrix direction, C—Sealing length in circumferential direction Figure 1
1The groove of part A should be painted red.
2The dimensional error should not be less than the requirements of IT14 in GB/T1804. Figure 2
1—Gas source; 2—Regulating valve; 3—Thermometer; 4—Pressure gauge; 5—Valve assembly Figure 4
6.11 Gas resistance test of rubber sealing gasket and valve gasket 099
6.11.1In addition to the test in 6.10, the following tests should be carried out. Put three samples with a thickness of 2mm, an outer diameter of 19mm and an inner diameter of 8mm into the device shown in Figure 6 filled with 0.5g of n-pentane liquid, and compress the samples to 80% of their original thickness. After weighing the device, place it in an atmosphere of 23℃±3℃, weigh it again after 24 hours, and calculate the average leakage of n-pentane per hour for the three samples. 6.11.2 After the test in 6.11.1, discharge the n-pentane liquid in the device, keep it in a constant temperature bath at 100℃±2℃ for 7 days, and then do the test in 6.11.1 again, and calculate the average leakage of n-pentane per hour for the three tests. Static pressure
1-Test sample, 2-Metal gasket; 3-Space with an internal volume of 5.5cm Figure 6
6.12 Lubricating grease gas resistance test
Approximately 0.5g of lubricating grease is evenly coated on the aluminum plate, and its mass is measured after being placed at room temperature for 24 hours. Then it is placed in the U-shaped tube of the test device shown in Figure 7, and the glass valves A and B are opened to replace the internal air with butane gas. Valve B is closed to keep the butane gas pressure in the U-shaped tube at 5kPa. At the same time, the lubricating grease is placed in an environment with a temperature of 20℃±1℃ and 4℃±1℃ for 1 hour, and the mass of the lubricating grease at the two temperatures is measured. The mass change rate of the lubricating grease is calculated using formula (3). 4M
Where: 4M——mass change rate, %;
Mo—mass before the test, g;
M—mass after the test, g.
6.13 Additional device performance test
MM. ,
All additional devices on the assembly shall be tested according to their respective standard requirements. 6.14 Durability test
Use butane gas with a butane (CH10) content of more than 95% (volume ratio) to pass through the valve of the valve assembly at a flow rate of 1.5 to 3.0L/h. At the same time, perform switching actions 12,000 times at an operating speed of 520 times per minute. Check for any abnormalities, and then check the air tightness and operating torque according to 6.4 and 6.6.
6.15 Low temperature environment test, place the main body of the valve assembly in a closed state in air at -20℃±2℃ for 24 hours, take it out and place it in normal temperature and humidity air (laboratory conditions) for 3 hours to check for any abnormalities, and then check the air tightness and operating torque according to 6.4 and 6.6. 6.16 High temperature environment test
Place the valve assembly in a closed state in air at the temperature specified by the manufacturer for 24 hours, then take it out and place it in air at normal temperature and humidity for 3 hours to check for any abnormalities, and then test it according to 6.4 and 6.6 Check the air tightness and operating torque. 3
1—Alkane gas, 2—Pressure regulator, 3—U-shaped pressure gauge, 4 Thermometer, 5—Temperature is 21℃±1℃ or 14℃±1℃, 6—Constant temperature water tank; 7 U-shaped tube with glass valve; 8—Test sample; 9 Aluminum plate Figure 7
6.17 Vibration test
Fix the valve assembly on the vibration table, and vibrate it up and down and left and right for 30 minutes at a frequency of 4Hz and an amplitude of 5mm. Then check the air tightness and operating torque according to 6.4 and 6.6.
6.18 Electrical performance test
Test according to the electrical performance requirements in the standard of the additional device. 7 Inspection rules
7.1 General
7.1.1 The main body of the plug valve should be tested for air tightness at the factory one by one, and it is required to be visually observed that there is no pressure drop under 10kPa pressure for 1 minute. 7.1.2 The selection of sealing materials and grease shall comply with the requirements of 5.2.7. 7.1.3 Each additional device shall be inspected and accepted according to its own standards. 7.2 After assembly, batch inspection (factory inspection) and periodic inspection (type inspection) shall be carried out. 7.3 Batch inspection
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