304/316 Stainless Steel Capillary Tubes in HVAC & Refrigeration Systems
Capillary Tubes in HVAC: Precision for Climate Control
Heating, ventilation, and air conditioning (HVAC) systems rely on stainless steel capillary tubes for pressure sensing, refrigerant handling, and control systems. Both 304 and 316 stainless steel grades are used, with selection depending on the refrigerant type, operating conditions, and environmental factors.
Applications in HVAC Systems
Pressure Sensing
- Refrigerant pressure monitoring: High-side and low-side pressure sensing for system control
- Compressor protection: High-pressure cutoff, low-pressure cutoff
- Condenser/evaporator monitoring: Pressure differential measurement
Refrigerant Handling
- Expansion valve components: Capillary tubes for thermal expansion valve sensing bulbs
- Refrigerant charging lines: Precision tubing for refrigerant transfer
- Oil return lines: Compressor lubrication system components
Temperature Sensing
- Air temperature sensing: RTD and thermocouple protection tubes
- Water temperature sensing: Chilled water and hot water monitoring
- Defrost control: Evaporator coil temperature sensing
Material Selection for HVAC
| Application | Recommended Grade | Reason |
|---|---|---|
| Standard refrigerant systems | 304 | Cost-effective, good refrigerant compatibility |
| Marine HVAC | 316 | Salt air corrosion resistance |
| Chemical plant HVAC | 316 | Chemical atmosphere resistance |
| Food processing HVAC | 304/316 | Sanitary requirements |
Common Sizes for HVAC
| Application | OD (mm) | Wall (mm) |
|---|---|---|
| Pressure sensing | 3.0-6.0 | 0.3-0.5 |
| Temperature sensing | 3.0-6.0 | 0.3-0.5 |
| Refrigerant lines | 2.0-4.0 | 0.25-0.5 |
| Control lines | 1.5-3.0 | 0.2-0.3 |
Quality Requirements
- Hydrostatic pressure testing to 3x operating pressure
- Helium leak testing for refrigerant systems
- Cleanliness: no oil, grease, or particulate contamination
- End caps for shipping protection
Request a Quote
Contact us with your HVAC application requirements — grade, dimensions, pressure rating, quantity — and receive a competitive quote within 24 hours.
Healsmed
Leading Stainless Steel Capillary Tube Factory. 1,400+ standard sizes IN STOCK & ready to ship worldwide! High precision, factory-direct price.
