SS410 SS420 Engraved Valve Hardware Connection Fittings Connection Fittings

Mainly used in the refrigeration circuits of air conditioners, refrigerators, freezers and other refrigeration equipment.

• Expansion valve controls the flow and pressure of refrigerant to enable vaporization and heat absorption
• Four-way valve switches between cooling and heating modes by changing refrigerant flow direction
• Solenoid valve controls refrigeration circuit on-off to ensure normal system operation

• Precise flow control to maintain stable cooling and heating performance
• Material resistant to refrigerant corrosion, compatible with common refrigerants including R22, R410A, R32
• Stable operation at low temperatures down to -40°C without jamming or leakage

• Internal flow passages must be extremely smooth with surface roughness below Ra0.4
• Fitting clearance between valve core and body controlled within ±0.005 mm for precise flow control
• Processing in dry, clean environment with strict moisture and oil residue prevention
• Four-way valve reversing mechanism must be flexible and reliable with 0.5-1 second switching time
• Comprehensive leakage and flow accuracy testing with ±5% adjustment error tolerance

• Must be compatible with specific refrigerant type (R22, R410A, etc.)
• Prioritize fast response and accurate opening characteristics
• Choose branded valves originally matched with equipment for proven reliability
• Inspect appearance for scratches, deformation, and verify welding joint quality

Complete inspection lab with Micrometer, Optical Comparator, Caliper Vernier, CMM, Depth Caliper Vernier, Universal Protractor, Clock Gauge, Internal Centigrade Gauge. ISO9001 and TS16949 certified with 8S management system.

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