JB/T 7223-1994 Two-position three-way solenoid valve for small refrigeration system
Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T7223-94
For small refrigeration system
Two-position three-way solenoid valve
Published on July 18, 1994
Ministry of Machinery Industry of the People's Republic of China
Implemented on July 1, 1995
Mechanical Industry Standard of the People's Republic of China
For small refrigeration system
Two-position three-way solenoid valve
Subject content and applicable pressure range
JB/T7223-94
This standard specifies the type and basic parameters, technical requirements, test methods, inspection rules and marking, packaging, Storage This standard applies to R12, R134a or refrigerants with similar thermodynamic properties and liquid pipeline solenoid valves with a nominal diameter not greater than 2mm 2 Reference standards
GB2423.17
JB/T4119
3 Terminology
Basic environmental test procedures for electrical and electronic products Test Ca: Steady-state damp heat test method
Basic environmental test procedures for electrical and electronic products Test Ka: Salt spray test method Refrigeration solenoid valves
3.1 Two-position three-way solenoid valve
A two-position three-way solenoid valve is a solenoid valve in which the movable iron core has two working positions and three interfaces (one inlet, one normally closed outlet and one normally open outlet), and the flow direction of the refrigerant is controlled by the change of the working position of the iron core (such as As shown in Figure 1). Delivery port
Normal closed outlet
Type and basic parameters
4.1 Type
With open outlet
The type of solenoid valve is a direct-acting structure with AC power converted into DC power by bridge rectification and overvoltage and overcurrent safety protection.
4.2 Model
The model of the solenoid valve is:
FDF door
Characteristic code
Nominal diameter, mm
Code for solenoid valve used in Freon refrigeration system
Approved by the Ministry of Machinery Industry on July 18, 1994
Implemented on July 1, 1995
4.3 Basic number
JB/T722394|| tt||4.3.1 The inlet state parameters and pressure drop of the solenoid valve under nominal working conditions are: a.
The inlet pressure is the condensing pressure corresponding to a temperature of 54.4C (in MPa): the inlet temperature is 32.2℃;
The pressure drop is 15kPa.
The calculation conditions of the nominal capacity of the solenoid valve are as follows; a.
The condensing temperature is 54.4℃;
The temperature of the liquid refrigerant entering the capillary is 32.2℃; the evaporation temperature is -23.2℃:
The suction temperature of the compressor is 32.2℃.
5 Technical requirements
General requirements
Solenoid valves should be manufactured in accordance with the provisions of this standard and in accordance with the drawings and technical documents approved by the prescribed procedures. 5.2 Appearance
The surface of the solenoid valve should not have defects such as shaving and scratching, fasteners should not be loose, the inlet and outlet should be covered with sheaths, the monument should be clear, and there should be no warping and falling off.
5.3 Working conditions
5.3.1 The solenoid valve should be able to work normally under the conditions of ambient temperature of -20~50℃ and relative humidity not more than 90%. 5.3.2 The allowable temperature of refrigerant fluid is -20~65℃. 5.4 Rated voltage
The rated voltage of the solenoid valve is 220V,
5.5 Voltage fluctuation
The solenoid valve should be able to work normally within the range of 85%~115% of the rated voltage. 5.6 Maximum working pressure
The maximum working pressure of the solenoid valve is 2.0MPa. 5.7
Hydraulic strength
The electromagnetic valve should be able to withstand a liquid (water) pressure of 3.0MPa, and there should be no leakage or abnormal deformation when the pressure is maintained for 3 minutes. 5.8 Air tightness
Under a gas pressure of 2.0MPa, there should be no bubbles escaping from the electromagnetic valve when the pressure is maintained for 1 minute. 5.9 Maximum opening pressure difference
The maximum opening pressure difference of the electromagnetic valve should not be less than 1.8MPa. 5.10 Leakage
Under a pressure difference of 50kPa, the internal leakage of the electromagnetic valve should not be greater than 10mL/min. 5.11 Cleanliness
The residual impurity content inside the electromagnetic valve should not be greater than 2mg. 5.12 Water content
The residual water content inside the electromagnetic valve should not be greater than 1mg. 5.13 Wire temperature
The stable temperature of the electromagnetic coil should not be greater than that specified in Table 1. 2
Insulation level
5.14 Safety performance
5.14.1 Insulation resistance
JB/T 7223-94
When the ambient temperature is 5～43℃ and the relative humidity is not more than 85%, the insulation resistance between the coil terminal and the shell of the electromagnetic valve should be not less than 100MO.
5.14.2 Electrical strength
When the ambient temperature is 5～43℃ and the relative humidity is not more than 85%, the electrical strength test between the line and surface terminal and the shell of the solenoid valve should be able to withstand 1500V, 50Hz sinusoidal alternating current for 1min, without insulation breakdown and surface flashover. 5.14.3 Wet heat test
The solenoid valve shall be subjected to a 48h wet heat test in accordance with the provisions of GB2423.3. After the test, the insulation resistance of the solenoid valve shall not be less than 10MQ, and it can withstand the electrical strength test of 1250V, 50Hz sinusoidal alternating current for 1min. 5.15 Nominal capacity
The solenoid valve manufacturer shall specify its nominal capacity, and the measured capacity under nominal working conditions shall not be less than 98% of the specified nominal capacity. 5.16 Corrosion resistance
The electroplating layer of the solenoid valve shall be subjected to a 48h salt spray test in accordance with the provisions of GB2423.17. After the test, the electroplating layer of the parts outside the 2mm of the edge and the correction angle shall not have defects such as corrosion, blistering, and peeling. 5.17 Lifespan
The solenoid valve shall still be able to work normally after working continuously for 200,000 times, and its leakage shall not be greater than twice the leakage specified in Article 5.10. 5.18 Warranty period
If the user complies with the provisions of the product manual, the manufacturer shall repair or replace the electromagnetic valve free of charge if it is damaged or fails to work properly due to poor manufacturing within 18 months from the date of shipment from the manufacturer. 6 Test method
6.1 Instruments, meters and test equipment
The instruments, meters and test equipment for testing the electromagnetic valve shall comply with the requirements of JB/T-4119. 6.2 Appearance
Visual inspection.
6.3 Hydraulic strength test
Install the electromagnetic valve on the device shown in Figure 2, so that the specified flow direction of the valve is opposite to the flow direction of the test system medium, block the valve inlet, and slowly input 3.0MPa pressure liquid (water) from the valve outlet to maintain the pressure for 3 minutes. There should be no external leakage or abnormal deformation. 6.4 Air tightness test
Remove the electromagnetic valve coil and install the electromagnetic valve on the device shown in Figure 2, so that the specified flow direction of the valve is opposite to the flow direction of the test system medium, block the valve inlet, immerse the valve body in water, and then slowly input 2.0MPa pressure gas from the valve outlet, maintain the pressure for 1min, and check that there should be no bubbles escaping from the valve surface and each connection. Other equivalent methods are allowed, such as internal inflation, external bubble test, etc. 6.5 Maximum valve opening pressure difference test
Install the electromagnetic valve on the device shown in Figure 2, so that the specified flow direction of the valve is the same as the flow direction of the test system medium, connect the electromagnetic valve coil to 85% of the rated voltage, and slowly increase the test pressure (nitrogen or air) to the maximum valve opening pressure difference, open and close five times continuously, and the opening and closing time interval is 30~40s.
6.6 Leakage test
JB/T.722394
1, 4.6, 8, 9, 10.13-Manual valve + 2, 12-One-way valve: 3-Pressure regulating valve; 5-Pressure gauge; 7-Tested solenoid valve, 11-Container Install the solenoid valve on the device shown in Figure 3, so that the specified flow direction is the same as the flow direction of the test system medium, input air with a pressure equal to 50kPa from the inlet of the solenoid valve, open and close the valve five times first, then close the solenoid valve and observe the display value of the flow meter (the leakage at the two ports should be measured separately).
1, 4 pressure gauge: 2--pressure regulating valve: 3-manual valve; 5-measured electromagnetic filter: 6-flow measuring instrument 6.7 Cleanliness determination
6.7.1 Determination steps
After washing the filter cup 5 with distilled water, put it into an electric constant temperature drying oven for baking at a temperature of 105±2°C for 15 minutes. After baking according to JB/T7223-94
, take out the filter cup and scatter it in the air to cool for 30 minutes. Then weigh it with a 1/10,000 balance and the weight is G: b. Inject about 5mL of 95% ethanol at the entrance of the electromagnetic filter, change direction 20 times at a switching frequency of 1-2Hz, and blow the ethanol into the filter cup with 0.050.1MPa nitrogen;
c.Bake the filter cup containing impurities in an electric thermostat at 105±2℃ for 30 minutes, take it out and cool it in the air for 30 minutes, then weigh it again with a 1/10,000 balance to obtain the weight G:. 6.7.2 The weight of the residual impurities G is calculated according to formula (1): G = G, -G, mg
6.8 Determination of water content
The water content of the solenoid valve is determined by the electrolytic method USI-3 refrigerator system water tester. 6.9 Determination of coil temperature
6.9.1 Determination of coil temperature rise
Put the solenoid valve in a constant temperature box at 43±2℃. When the coil temperature is balanced, measure and record the initial resistance value of the coil, connect 115% of the rated voltage, and when the coil reaches thermal stability, measure and record the resistance value of the coil again, and use the resistance method to determine the temperature rise. The calculation formula is as shown in Formula 2) (only applicable to copper windings):
Where—temperature rise.℃;
4=RR(234.5 + )- (tt)
R,—initial resistance of the coil, O;
R—resistance of the coil after thermal stabilization, a;
t-—ambient temperature at the beginning of the coil, ℃: ambient temperature when the coil is thermally stable, ℃. 6.9.2 The temperature of the line diagram is equal to the temperature rise plus 43℃. 6.10 Insulation resistance test
The insulation resistance of the solenoid valve coil is measured with a megohmmeter with a DC voltage of 500V. 6.11 Electric strength test
This test should be carried out after the test in 6.9 is passed. The test should be measured on a high-voltage test device with an output power of not less than 0.25kVA and a power supply frequency of 50Hz. The voltage is slowly increased to the specified test voltage value and maintained for 1min. There should be no insulation breakdown and surface flashover. Then the voltage is slowly reduced to zero and the power is cut off. 6.12 Nominal capacity test
By testing the water flow in the two passages of the solenoid valve, the capacity of the solenoid valve is calculated by Appendix A (supplement). It can also be measured with other liquids with similar properties. The smaller value is taken as the nominal capacity of the electric valve. Install the solenoid valve on the device shown in Figure 3, and gradually adjust the pressure drop through the valve from 6.86kPa to 68.6kPa, with each increment of 6.86kPa, and record the pressure drop, liquid temperature before the valve and liquid mass flow value (which should be measured in two states: power on and power off) during each test.
6.13 Life test
Install the solenoid valve on the device shown in Figure 4, and pass water (air) with a pressure of 1.0MPa. Open and close the valve continuously for 200,000 times at a frequency of 20 times per minute in a normal temperature environment. The solenoid valve should operate correctly during the entire test. 5
JB/T7223-94
1, 3, 7, 8.9, 10—manual control gate+2, 4, 6—pressure measuring instrument i5—pressure differential measuring instrument, 11—manual bypass, 16
12—solenoid valve under test, 13, 15—temperature measuring instrument, 14—flow measuring instrument: 16-pump, 17--pressure regulating instrument: 18—test liquid tank 7 Inspection rules
General requirements
Solenoid valves shall be inspected and qualified by the quality inspection department of the manufacturer before they can be shipped out of the factory. 7.2 The items, technical requirements and test methods for the factory inspection and sampling inspection of solenoid valves shall be in accordance with the provisions of Table 2. Table 2
Hydraulic strength
Air tightness
Maximum opening pressure difference
Leakage
Cleanliness
Water content
Wire thickness
Insulation resistance
Electrical strength
Nominal capacity
Factory inspection
Note: \V\ indicates required inspection items
7.3 Factory inspection
Sampling inspection
Each solenoid valve shall be factory inspected according to the required factory inspection items specified in Table 2. 6
Technical requirements clause
Clause 5.14.1
Clause 5.14.2
Test method clause
7.4 Sampling inspection
JB/T 7223-94
7.4.1 Products produced in batches shall be sampled and inspected from time to time to check the stability of the production process. 7.4.2 The same type of electromagnetic reading produced in each shift shall be regarded as an inspection batch, and the inspection items specified in Table 2 and the one-time sampling plan specified in Table 3 shall be inspected.
Batch N
≤500
>500~1200
7.5 Type inspection
Sample size
Type inspection shall be carried out in any of the following situations: New products produced on trial basis, products transferred from other factories:
Qualified judgment number A.
When there are major changes in the process, structure or raw materials that may affect product performance: the continuous production shall be inspected once every year.
The samples for type inspection can be randomly selected from the leather product library or users, and shall not be less than five units. 7.5.2
The items for type inspection are all the items specified in the technical requirements of this standard. Marking, packaging and storage
8.1 Marking
The following contents shall be marked on the solenoid valve label: a.
Manufacturer name and trademark;
Solenoid valve model and name:
Rated voltage, rated power and power consumption;
Maximum valve opening pressure difference (MOPD):
Working medium:
Product number or production date.
Number of unqualified judgment R.
8.2 Packaging
The packaging mode and method of the solenoid valve shall be determined by the manufacturer according to the regulations of the transportation department or determined through consultation with the ordering unit, but it shall ensure that the product will not be damaged during normal transportation. 8.2.2
The outside of the packaging box shall be marked with:
Product model, name and quantity
Name and address of the manufacturer:
Name and address of the consignee:
"Handle with care", "Afraid of moisture", "Upward" and other signs. 8.2.3
When the product is packaged, the following documents shall be brought along: a.
Product certificate;
Product manual,
8.3 Storage
The solenoid valve shall be stored in a dry, ventilated warehouse without harmful gases. 7
A1 Calculation of liquid refrigerant capacity
JB/T7223—94
Appendix A
Method for calculating the capacity of electromagnetic valve
(Supplement)
According to the data measured in Article 6.12, calculate the product H value of the liquid density and pressure drop at each test point: HPpw
Where: ow
The liquid density at the entrance of the electromagnetic valve is determined by the water temperature at the entrance, kg/m*; The pressure drop of the wave body through the electromagnetic valve is 9.8×10\Pa. ·(A1)
On the logarithmic coordinate paper, with the mass flow rate W of the electromagnetic valve liquid as the ordinate and Hw as the abscissa, draw a curve as shown in Figure A1. *M
According to the nominal working conditions given in Article 4.3.1, calculate the product H value of the density of liquid refrigerant and the pressure drop: H=ppa
Where: l—Density of liquid refrigerant at the entrance of the solenoid valve, kg/m:-Pressure drop of liquid refrigerant through the solenoid valve, 9.8×10\Pa, according to the H. value calculated by formula (A2), the corresponding mass flow rate of the solenoid valve refrigerant W.(kg/s) is found in Figure A1. Finally, calculate the capacity Q (in kW) of the refrigerant passing through the electromagnetic valve, Q=wui, -i)
Where:
-Flame value at the entrance of the expansion valve (or capillary) in the refrigeration system, kJ/kg;-Saturated fumigation value at the evaporation temperature in the refrigeration system, kJ/kg. Additional notes:
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry, and this standard is drafted by Zhejiang Xinchang Refrigeration Parts Factory. The person responsible for drafting this standard is Chen Yuzhong.—Initial resistance of the coil, O;
R—Resistance of the coil after thermal stabilization, a;
t-—Ambient temperature at the beginning of the coil diagram, ℃: Ambient temperature when the coil is thermally stable, ℃. 6.9.2 The temperature of the coil diagram is equal to the temperature rise plus 43℃, 6.10 Insulation resistance test
The insulation resistance of the solenoid valve coil is measured with a megohmmeter with a DC voltage of 500V. 6.11 Electrical strength test
This test should be carried out after the test in Article 6.9 is passed. The test should be measured on a high-voltage test device with an output power of not less than 0.25kVA and a power supply frequency of 50Hz. The voltage is slowly increased to the specified test voltage value and maintained for 1min. There should be no insulation breakdown and surface flashover. Then the voltage is slowly reduced to zero and the power supply is cut off. 6.12 Nominal capacity test
By testing the water flow of the two passages of the solenoid valve, the capacity of the solenoid valve is calculated by Appendix A (supplement). It can also be measured with other liquids of similar properties, and the smaller value is taken as the nominal capacity of the solenoid valve. Install the solenoid valve on the device shown in Figure 3, gradually adjust the pressure drop through the valve from 6.86kPa to 68.6kPa, with each increment of 6.86kPa, and record the pressure drop, liquid temperature before the valve and the mass flow value of the liquid during each test (it should be measured in two states: power on and power off).
6.13 Life test
Install the solenoid valve on the device shown in Figure 4, pass water (air) with a pressure equal to 1.0MPa, and open and close it continuously for 200,000 times at a frequency of 20 times per minute in a normal temperature environment. The solenoid valve should operate correctly during the entire test. 5
JB/T7223-94
1, 3, 7, 8.9, 10—manual control gate+2, 4, 6—pressure measuring instrument i5—pressure differential measuring instrument, 11—manual bypass, 16
12—solenoid valve under test, 13, 15—temperature measuring instrument, 14—flow measuring instrument: 16-pump, 17--pressure regulating instrument: 18—test liquid tank 7 Inspection rules
General requirements
Solenoid valves shall be inspected and qualified by the quality inspection department of the manufacturer before they can be shipped out of the factory. 7.2 The items, technical requirements and test methods for the factory inspection and sampling inspection of solenoid valves shall be in accordance with the provisions of Table 2. Table 2
Hydraulic strength
Air tightness
Maximum opening pressure difference
Leakage
Cleanliness
Water content
Wire thickness
Insulation resistance
Electrical strength
Nominal capacity
Factory inspection
Note: \V\ indicates required inspection items
7.3 Factory inspection
Sampling inspection
Each solenoid valve shall be factory inspected according to the required factory inspection items specified in Table 2. 6
Technical requirements clause
Clause 5.14.1
Clause 5.14.2
Test method clause
7.4 Sampling inspection
JB/T 7223-94
7.4.1 Products produced in batches shall be sampled and inspected from time to time to check the stability of the production process. 7.4.2 The same type of electromagnetic reading produced in each shift shall be regarded as an inspection batch, and the inspection items specified in Table 2 and the one-time sampling plan specified in Table 3 shall be inspected.
Batch N
≤500
>500~1200
7.5 Type inspection
Sample size
Type inspection shall be carried out in any of the following situations: New products produced on trial basis, products transferred from other factories:
Qualified judgment number A.
When there are major changes in the process, structure or raw materials that may affect product performance: the continuous production shall be inspected once every year.
The samples for type inspection can be randomly selected from the leather product library or users, and shall not be less than five. 7.5.2
The items for type inspection are all the items specified in the technical requirements of this standard. Marking, packaging and storage
8.1 Marking
The following contents shall be marked on the solenoid valve label: a.
Manufacturer name and trademark;
Solenoid valve model and name:
Rated voltage, rated power and power consumption;
Maximum valve opening pressure difference (MOPD):
Working medium:
Product number or production date.
Number of unqualified judgment R.
8.2 Packaging
The packaging mode and method of the solenoid valve shall be determined by the manufacturer according to the regulations of the transportation department or determined through consultation with the ordering unit, but it shall ensure that the product will not be damaged during normal transportation. 8.2.2
The outside of the packaging box shall be marked with:
Product model, name and quantity
Manufacturer name and address:
Consignee name and address:
"Handle with care", "Afraid of moisture", "Upward" and other signs. 8.2.3
When the product is packaged, the following documents shall be brought along: a.
Product certificate;
Product manual,
8.3 Storage
The solenoid valve shall be stored in a dry, ventilated warehouse without harmful gases. 7
A1 Calculation of liquid refrigerant capacity
JB/T7223—94
Appendix A
Method for calculating the capacity of electromagnetic valve
(Supplement)
According to the data measured in Article 6.12, calculate the product H value of the liquid density and pressure drop at each test point: HPpw
Where: ow
The liquid density at the entrance of the electromagnetic valve is determined by the water temperature at the entrance, kg/m*; The pressure drop of the wave body through the electromagnetic valve is 9.8×10\Pa. ·(A1)
On the logarithmic coordinate paper, with the mass flow rate W of the electromagnetic valve liquid as the ordinate and Hw as the abscissa, draw a curve as shown in Figure A1. *M
According to the nominal working conditions given in Article 4.3.1, calculate the product H value of the density of liquid refrigerant and the pressure drop: H=ppa
Where: l—Density of liquid refrigerant at the inlet of the solenoid valve, kg/m:-Pressure drop of liquid refrigerant through the solenoid valve, 9.8×10\Pa, according to the H. value calculated by formula (A2), the corresponding mass flow rate of the solenoid valve refrigerant W.(kg/s) is found in Figure A1. Finally, calculate the capacity Q (in kW) of the refrigerant passing through the electromagnetic valve, Q=wui, -i)
Where:
-Flame value at the inlet of the expansion valve (or capillary) in the refrigeration system, kJ/kg;-Saturated fumigation value at the evaporation temperature in the refrigeration system, kJ/kg. Additional notes:
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry, and this standard is drafted by Zhejiang Xinchang Refrigeration Parts Factory. The person responsible for drafting this standard is Chen Yuzhong.—Initial resistance of the coil, O;
R—Resistance of the coil after thermal stabilization, a;
t-—Ambient temperature at the beginning of the coil diagram, ℃: Ambient temperature when the coil is thermally stable, ℃. 6.9.2 The temperature of the coil diagram is equal to the temperature rise plus 43℃, 6.10 Insulation resistance test
The insulation resistance of the solenoid valve coil is measured with a megohmmeter with a DC voltage of 500V. 6.11 Electrical strength test
This test should be carried out after the test in Article 6.9 is passed. The test should be measured on a high-voltage test device with an output power of not less than 0.25kVA and a power supply frequency of 50Hz. The voltage is slowly increased to the specified test voltage value and maintained for 1min. There should be no insulation breakdown and surface flashover. Then the voltage is slowly reduced to zero and the power supply is cut off. 6.12 Nominal capacity test
By testing the water flow of the two passages of the solenoid valve, the capacity of the solenoid valve is calculated by Appendix A (supplement). It can also be measured with other liquids of similar properties, and the smaller value is taken as the nominal capacity of the solenoid valve. Install the solenoid valve on the device shown in Figure 3, gradually adjust the pressure drop through the valve from 6.86kPa to 68.6kPa, with each increment of 6.86kPa, and record the pressure drop, liquid temperature before the valve and the mass flow value of the liquid during each test (it should be measured in two states: power on and power off).
6.13 Life test
Install the solenoid valve on the device shown in Figure 4, pass water (air) with a pressure equal to 1.0MPa, and open and close it continuously for 200,000 times at a frequency of 20 times per minute in a normal temperature environment. The solenoid valve should operate correctly during the entire test. 5
JB/T7223-94
1, 3, 7, 8.9, 10—manual control gate+2, 4, 6—pressure measuring instrument i5—pressure differential measuring instrument, 11—manual bypass, 16
12—solenoid valve under test, 13, 15—temperature measuring instrument, 14—flow measuring instrument: 16-pump, 17--pressure regulating instrument: 18—test liquid tank 7 Inspection rules
General requirements
Solenoid valves shall be inspected and qualified by the quality inspection department of the manufacturer before they can be shipped out of the factory. 7.2 The items, technical requirements and test methods for the factory inspection and sampling inspection of solenoid valves shall be in accordance with the provisions of Table 2. Table 2
Hydraulic strength
Air tightness
Maximum opening pressure difference
Leakage
Cleanliness
Water content
Wire thickness
Insulation resistance
Electrical strength
Nominal capacity
Factory inspection
Note: \V\ indicates required inspection items
7.3 Factory inspection
Sampling inspection
Each solenoid valve shall be factory inspected according to the required factory inspection items specified in Table 2. 6
Technical requirements clause
Clause 5.14.1
Clause 5.14.2
Test method clause
7.4 Sampling inspectionbzxz.net
JB/T 7223-94
7.4.1 Products produced in batches shall be sampled and inspected from time to time to check the stability of the production process. 7.4.2 The same type of electromagnetic reading produced in each shift shall be regarded as an inspection batch, and the inspection items specified in Table 2 and the one-time sampling plan specified in Table 3 shall be inspected.
Batch N
≤500
>500~1200
7.5 Type inspection
Sample size
Type inspection shall be carried out in any of the following situations: New products produced on trial basis, products transferred from other factories:
Qualified judgment number A.
When there are major changes in the process, structure or raw materials that may affect product performance: the continuous production shall be inspected once every year.
The samples for type inspection can be randomly selected from the leather product library or users, and shall not be less than five units. 7.5.2
The items for type inspection are all the items specified in the technical requirements of this standard. Marking, packaging and storage
8.1 Marking
The following contents shall be marked on the solenoid valve label: a.
Manufacturer name and trademark;
Solenoid valve model and name:
Rated voltage, rated power and power consumption;
Maximum valve opening pressure difference (MOPD):
Working medium:
Product number or production date.
Number of unqualified judgment R.
8.2 Packaging
The packaging mode and method of the solenoid valve shall be determined by the manufacturer according to the regulations of the transportation department or determined through consultation with the ordering unit, but it shall ensure that the product will not be damaged during normal transportation. 8.2.2
The outside of the packaging box shall be marked with:
Product model, name and quantity
Name and address of the manufacturer:
Name and address of the consignee:
"Handle with care", "Afraid of moisture", "Upward" and other signs. 8.2.3
When the product is packaged, the following documents shall be brought along: a.
Product certificate;
Product manual,
8.3 Storage
The solenoid valve shall be stored in a dry, ventilated warehouse without harmful gases. 7
A1 Calculation of liquid refrigerant capacity
JB/T7223—94
Appendix A
Method for calculating the capacity of electromagnetic valve
(Supplement)
According to the data measured in Article 6.12, calculate the product H value of the liquid density and pressure drop at each test point: HPpw
Where: ow
The liquid density at the entrance of the electromagnetic valve is determined by the water temperature at the entrance, kg/m*; The pressure drop of the wave body through the electromagnetic valve is 9.8×10\Pa. ·(A1)
On the logarithmic coordinate paper, with the mass flow rate W of the electromagnetic valve liquid as the ordinate and Hw as the abscissa, draw a curve as shown in Figure A1. *M
According to the nominal working conditions given in Article 4.3.1, calculate the product H value of the density of liquid refrigerant and the pressure drop: H=ppa
Where: l—Density of liquid refrigerant at the entrance of the solenoid valve, kg/m:-Pressure drop of liquid refrigerant through the solenoid valve, 9.8×10\Pa, according to the H. value calculated by formula (A2), the corresponding mass flow rate of the solenoid valve refrigerant W.(kg/s) is found in Figure A1. Finally, calculate the capacity Q (in kW) of the refrigerant passing through the electromagnetic valve, Q=wui, -i)
Where:
-Flame value at the entrance of the expansion valve (or capillary) in the refrigeration system, kJ/kg;-Saturated fumigation value at the evaporation temperature in the refrigeration system, kJ/kg. Additional notes:
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry, and this standard is drafted by Zhejiang Xinchang Refrigeration Parts Factory. The person responsible for drafting this standard is Chen Yuzhong.9, 10—manually controlled wide door +2, 4, 6—pressure measuring instrument i5—differential pressure measuring instrument, 11—manual bypass, 16
12—solenoid valve under test, 13, 15—temperature measuring instrument, 14—flow measuring instrument: 16-pump, 17--pressure regulating instrument: 18—test liquid tank 7 Inspection rules
General requirements
Solenoid valves shall be inspected and qualified by the quality inspection department of the manufacturer before they can be shipped out of the factory. 7.2 The items, technical requirements and test methods for factory inspection and sampling inspection of solenoid valves shall be in accordance with the provisions of Table 2. Table 2
Hydraulic strength
Air tightness
Maximum opening pressure difference
Leakage
Cleanliness
Water content
Wire thickness
Insulation resistance
Electrical strength
Nominal capacity
Factory inspection
Note: \V\ indicates required inspection items
7.3 Factory inspection
Sampling inspection
Each solenoid valve shall be factory inspected according to the required factory inspection items specified in Table 2. 6
Technical requirements clause
Clause 5.14.1
Clause 5.14.2
Test method clause
7.4 Sampling inspection
JB/T 7223-94
7.4.1 Products produced in batches shall be sampled and inspected from time to time to check the stability of the production process. 7.4.2 The same type of electromagnetic reading produced in each shift shall be regarded as an inspection batch, and the inspection items specified in Table 2 and the one-time sampling plan specified in Table 3 shall be inspected.
Batch N
≤500
>500~1200
7.5 Type inspection
Sample size
Type inspection shall be carried out in any of the following situations: New products produced on trial basis, products transferred from other factories:
Qualified judgment number A.
When there are major changes in the process, structure or raw materials that may affect product performance: the continuous production shall be inspected once every year.
The samples for type inspection can be randomly selected from the leather product library or users, and shall not be less than five. 7.5.2
The items for type inspection are all the items specified in the technical requirements of this standard. Marking, packaging and storage
8.1 Marking
The following contents shall be marked on the solenoid valve label: a.
Manufacturer name and trademark;
Solenoid valve model and name:
Rated voltage, rated power and power consumption;
Maximum valve opening pressure difference (MOPD):
Working medium:
Product number or production date.
Number of unqualified judgment R.
8.2 Packaging
The packaging mode and method of the solenoid valve shall be determined by the manufacturer according to the regulations of the transportation department or determined through consultation with the ordering unit, but it shall ensure that the product will not be damaged during normal transportation. 8.2.2
The outside of the packaging box shall be marked with:
Product model, name and quantity
Manufacturer name and address:
Consignee name and address:
"Handle with care", "Afraid of moisture", "Upward" and other signs. 8.2.3
When the product is packaged, the following documents shall be brought along: a.
Product certificate;
Product manual,
8.3 Storage
The solenoid valve shall be stored in a dry, ventilated warehouse without harmful gases. 7
A1 Calculation of liquid refrigerant capacity
JB/T7223—94
Appendix A
Method for calculating the capacity of electromagnetic valve
(Supplement)
According to the data measured in Article 6.12, calculate the product H value of the liquid density and pressure drop at each test point: HPpw
Where: ow
The liquid density at the entrance of the electromagnetic valve is determined by the water temperature at the entrance, kg/m*; The pressure drop of the wave body through the electromagnetic valve is 9.8×10\Pa. ·(A1)
On the logarithmic coordinate paper, with the mass flow rate W of the electromagnetic valve liquid as the ordinate and Hw as the abscissa, draw a curve as shown in Figure A1. *M
According to the nominal working conditions given in Article 4.3.1, calculate the product H value of the density of liquid refrigerant and the pressure drop: H=ppa
Where: l—Density of liquid refrigerant at the inlet of the solenoid valve, kg/m:-Pressure drop of liquid refrigerant through the solenoid valve, 9.8×10\Pa, according to the H. value calculated by formula (A2), the corresponding mass flow rate of the solenoid valve refrigerant W.(kg/s) is found in Figure A1. Finally, calculate the capacity Q (in kW) of the refrigerant passing through the electromagnetic valve, Q=wui, -i)
Where:
-Flame value at the inlet of the expansion valve (or capillary) in the refrigeration system, kJ/kg;-Saturated fumigation value at the evaporation temperature in the refrigeration system, kJ/kg. Additional notes:
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry, and this standard is drafted by Zhejiang Xinchang Refrigeration Parts Factory. The person responsible for drafting this standard is Chen Yuzhong.9, 10—manually controlled wide door +2, 4, 6—pressure measuring instrument i5—differential pressure measuring instrument, 11—manual bypass, 16
12—solenoid valve under test, 13, 15—temperature measuring instrument, 14—flow measuring instrument: 16-pump, 17--pressure regulating instrument: 18—test liquid tank 7 Inspection rules
General requirements
Solenoid valves shall be inspected and qualified by the quality inspection department of the manufacturer before they can be shipped out of the factory. 7.2 The items, technical requirements and test methods for factory inspection and sampling inspection of solenoid valves shall be in accordance with the provisions of Table 2. Table 2
Hydraulic strength
Air tightness
Maximum opening pressure difference
Leakage
Cleanliness
Water content
Wire thickness
Insulation resistance
Electrical strength
Nominal capacity
Factory inspection
Note: \V\ indicates required inspection items
7.3 Factory inspection
Sampling inspection
Each solenoid valve shall be factory inspected according to the required factory inspection items specified in Table 2. 6
Technical requirements clause
Clause 5.14.1
Clause 5.14.2
Test method clause
7.4 Sampling inspection
JB/T 7223-94
7.4.1 Products produced in batches shall be sampled and inspected from time to time to check the stability of the production process. 7.4.2 The same type of electromagnetic reading produced in each shift shall be regarded as an inspection batch, and the inspection items specified in Table 2 and the one-time sampling plan specified in Table 3 shall be inspected.
Batch N
≤500
>500~1200
7.5 Type inspection
Sample size
Type inspection shall be carried out in any of the following situations: New products produced on trial basis, products transferred from other factories:
Qualified judgment number A.
When there are major changes in the process, structure or raw materials that may affect product performance: the continuous production shall be inspected once every year.
The samples for type inspection can be randomly selected from the leather product library or users, and shall not be less than five units. 7.5.2
The items for type inspection are all the items specified in the technical requirements of this standard. Marking, packaging and storage
8.1 Marking
The following contents shall be marked on the solenoid valve label: a.
Manufacturer name and trademark;
Solenoid valve model and name:
Rated voltage, rated power and power consumption;
Maximum valve opening pressure difference (MOPD):
Working medium:
Product number or production date.
Number of unqualified judgment R.
8.2 Packaging
The packaging mode and method of the solenoid valve shall be determined by the manufacturer according to the regulations of the transportation department or determined through consultation with the ordering unit, but it shall ensure that the product will not be damaged during normal transportation. 8.2.2
The outside of the packaging box shall be marked with:
Product model, name and quantity
Name and address of the manufacturer:
Name and address of the consignee:
"Handle with care", "Afraid of moisture", "Upward" and other signs. 8.2.3
When the product is packaged, the following documents shall be brought along: a.
Product certificate;
Product manual,
8.3 Storage
The solenoid valve shall be stored in a dry, ventilated warehouse without harmful gases. 7
A1 Calculation of liquid refrigerant capacity
JB/T7223—94
Appendix A
Method for calculating the capacity of electromagnetic valve
(Supplement)
According to the data measured in Article 6.12, calculate the product H value of the liquid density and pressure drop at each test point: HPpw
Where: ow
The liquid density at the entrance of the electromagnetic valve is determined by the water temperature at the entrance, kg/m*; The pressure drop of the wave body through the electromagnetic valve is 9.8×10\Pa. ·(A1)
On the logarithmic coordinate paper, with the mass flow rate W of the electromagnetic valve liquid as the ordinate and Hw as the abscissa, draw a curve as shown in Figure A1. *M
According to the nominal working conditions given in Article 4.3.1, calculate the product H value of the density of liquid refrigerant and the pressure drop: H=ppa
Where: l—Density of liquid refrigerant at the entrance of the solenoid valve, kg/m:-Pressure drop of liquid refrigerant through the solenoid valve, 9.8×10\Pa, according to the H. value calculated by formula (A2), the corresponding mass flow rate of the solenoid valve refrigerant W.(kg/s) is found in Figure A1. Finally, calculate the capacity Q (in kW) of the refrigerant passing through the electromagnetic valve, Q=wui, -i)
Where:
-Flame value at the entrance of the expansion valve (or capillary) in the refrigeration system, kJ/kg;-Saturated fumigation value at the evaporation temperature in the refrigeration system, kJ/kg. Additional notes:
This standard is proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry, and this standard is drafted by Zhejiang Xinchang Refrigeration Parts Factory. The person responsible for drafting this standard is Chen Yuzhong.8×10\Pa. ·(A1)
On the logarithmic coordinate paper, with the electromagnetic liquid mass flow rate W as the ordinate and Hw as the abscissa, draw a curve as shown in Figure A1. *M
According to the nominal operating conditions given in Article 4.3.1, calculate the product H value of the liquid refrigerant density and the pressure drop: H=ppa
Where: l—the density of the liquid refrigerant at the entrance of the electromagnetic valve, kg/m:—the pressure drop of the liquid refrigerant through the electromagnetic valve, 9.8×10\Pa, according to the H value calculated by formula (A2), the corresponding electromagnetic valve fatigue refrigerant mass flow rate W.(kg/s) can be found in Figure A1. Finally, the capacity Q (in kW) of the refrigerant in the electromagnetic wave is calculated, Q=wui, -i)
Where:
-flame value at the inlet of the expansion valve (or capillary tube) in the refrigeration system, kJ/kg; -saturated fumigation value at the evaporation temperature in the refrigeration system, kJ/kg. Additional notes:
This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry, and was drafted by Zhejiang Xinchang Refrigeration Parts General Factory. The drafter of this standard is Chen Yuzhong.8×10\Pa. ·(A1)
On the logarithmic coordinate paper, with the electromagnetic liquid mass flow rate W as the ordinate and Hw as the abscissa, draw a curve as shown in Figure A1. *M
According to the nominal operating conditions given in Article 4.3.1, calculate the product H value of the liquid refrigerant density and the pressure drop: H=ppa
Where: l—the density of the liquid refrigerant at the entrance of the electromagnetic valve, kg/m:—the pressure drop of the liquid refrigerant through the electromagnetic valve, 9.8×10\Pa, according to the H value calculated by formula (A2), the corresponding electromagnetic valve fatigue refrigerant mass flow rate W.(kg/s) can be found in Figure A1. Finally, the capacity Q (in kW) of the refrigerant in the electromagnetic wave is calculated, Q=wui, -i)
Where:
-flame value at the inlet of the expansion valve (or capillary tube) in the refrigeration system, kJ/kg; -saturated fumigation value at the evaporation temperature in the refrigeration system, kJ/kg. Additional notes:
This standard was proposed and managed by the Hefei General Machinery Research Institute of the Ministry of Machinery Industry, and was drafted by Zhejiang Xinchang Refrigeration Parts General Factory. The drafter of this standard is Chen Yuzhong.
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