How to remove the expansion valve: hot topics and operation guides on the Internet in the past 10 days
The expansion valve is a key component in the refrigeration system and is responsible for regulating the flow of refrigerant. Recently, the repair and replacement of expansion valves has become a hot topic in technical forums. This article will combine the hot content of the entire network in the past 10 days to provide you with a structured disassembly guide, and attach relevant data for reference.
1. Statistics of hot topics across the entire network (last 10 days)
| Platform | hot topics | amount of discussion |
|---|---|---|
| Zhihu | Car air conditioner expansion valve failure symptoms | 1,200+ |
| Baidu Tieba | Household air conditioning expansion valve disassembly tutorial | 850+ |
| Station B | Video analysis of the working principle of expansion valve | 500,000 views |
| Douyin | Tips for quickly judging whether the expansion valve is good or bad | 3 million likes |
2. Detailed explanation of the disassembly steps of the expansion valve
1. Safety preparation
• Turn off power to the cooling system
• Wear protective gloves and goggles
• Prepare special recovery equipment (refrigerants such as R134a require professional treatment)
2. Tool list
| Tool type | specific tools | Instructions for use |
|---|---|---|
| Disassembly tools | Hex wrench set | Remove fixing bolts |
| Detection tools | pressure gauge set | System pressure detection |
| Auxiliary tools | Refrigerant recovery machine | Environmentally friendly treatment of refrigerants |
3. Disassembly process
(1)System pressure relief: Connect the pressure gauge and slowly release the refrigerant pressure
(2)Disconnect: Mark and remove the inlet and outlet pipes (it is recommended to take photos and record them)
(3)Remove fasteners: Use the corresponding hexagonal wrench to remove the fixed bracket
(4)Take out the valve body: Carefully take out the expansion valve and pay attention to the position of the sealing ring.
3. Solutions to common problems
| Fault phenomenon | Possible reasons | Solution |
|---|---|---|
| Poor cooling effect | Valve core stuck | Clean or replace valve core |
| Abnormal frost formation in the system | Temperature sensing package failed | Replace temperature sensing element |
| Abnormal noise | Loose internal parts | Complete replacement of valve body |
4. Precautions
1.Environmental requirements: According to the Montreal Protocol, refrigerants must be professionally recycled
2.System matching: The new expansion valve needs to match the capacity of the original system (refer to the table below)
3.Seal detection: A pressure-maintaining leak detection test must be performed after installation.
| System type | Recommended expansion valve model | Cooling capacity range |
|---|---|---|
| Household air conditioner | TEX2-3.5 | 2.5-3.5KW |
| car air conditioner | H type expansion valve | 1.5-2.5 refrigeration tons |
| Commercial Freezer | Electronic expansion valve | 5KW and above |
5. Technology trend analysis
According to data from the entire network in the past 10 days, the discussion of electronic expansion valves has increased by 35%, mainly because:
• New energy vehicle thermal management system upgrade needs
• Improved energy efficiency standards for inverter air conditioners
• Requirements for precise temperature control in smart homes
It is recommended that technicians pay attention to:
1. Electronic expansion valve PID control technology
2. New environmentally friendly refrigerant matching solution
3. Intelligent valve body with self-diagnosis function
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