SHK-331: Triple Pressure Control & R-134a AC Pressure Switch
This SHK-331 is a high-performance AC pressure protection solution engineered for all vehicle types, optimized for modern R-134a systems with precise triple pressure regulation and specialized female thread compatibility.
| Category | Specification |
| Model Number | SHK-331 |
| Thread Size | M10×1.25 Female (Customizable) |
| Operating Pressure | HP OFF: 3.0MPa (Overpressure Protection) |
| MP ON: 1.9MPa (Medium Pressure Activation) |
| LP OFF: 0.2MPa (Underpressure Protection) |
| Refrigerant Compatibility | R-134a (Customizable for Other Types) |
| Vehicle Fit | All Vehicle Models |
| Customization | Thread, Pressure Thresholds, Refrigerant |
It integrates seamlessly with AC pipelines via the M10×1.25 Female thread—a specialized fitting for specific vehicle makes, eliminating adapter needs. The triple pressure control mechanism ensures all-round protection and efficient operation: HP OFF at 3.0MPa prevents compressor overheating and pipeline rupture, MP ON at 1.9MPa activates optimal cooling performance to maintain consistent comfort, and LP OFF at 0.2MPa avoids damage from refrigerant deficiency. Optimized for R-134a, it’s ideal for modern vehicle maintenance, aftermarket replacement, and OEM matching, while customization options cater to special configurations.
Superior Quality & Reliability Engineering
Quality is foundational to the SHK-331, with design and testing adhering to strict automotive industry standards (ISO/TS 16949). The switch features a corrosion-resistant brass housing that withstands extreme temperatures (-40℃ to 85℃) and engine compartment vibration, ensuring durability in harsh operating environments.
Its precision-calibrated pressure sensors offer a tolerance of ±0.05MPa, guaranteeing accurate response without false triggers. High-quality sealing materials compatible with R-134a ensure leak-proof performance (leakage rate <1×10⁻⁶ Pa·m³/s), while the durable silver-plated contact design passes over 100,000 pressure cycle tests—validating long-term reliability for the vehicle’s entire lifecycle.
Every unit undergoes rigorous quality inspections, including pressure threshold verification, helium leak testing, and temperature endurance trials. Batch production records and customization specs are fully traceable via serial numbers, backed by an 18-month warranty, providing confidence for users and business partners.
