SHK-350: Four-Pressure Control & R-134a AC Pressure Switch
This SHK-350 is a high-performance AC pressure protection solution engineered for all vehicle types, optimized for modern R-134a systems with four precise pressure control points and specialized female thread compatibility.
| Category | Specification |
| Model Number | SHK-350 |
| Thread Size | 7/16-20UNF Female (Customizable) |
| Operating Pressure | A/P (High Pressure OFF): 2.8MPa (Overpressure Protection) |
| M/P1 (Medium Pressure 1): 2.0MPa (Performance Regulation) |
| M/P2 (Medium Pressure 2): 1.5MPa (Efficiency Optimization) |
| B/P (Low Pressure OFF): 0.245MPa (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 7/16-20UNF Female thread—a standard fitting for specific vehicle makes, eliminating adapter needs. The four-pressure control mechanism ensures comprehensive protection and refined operation: A/P at 2.8MPa cuts off to prevent compressor overheating and pipeline rupture; M/P1 at 2.0MPa and M/P2 at 1.5MPa adjust system load (e.g., fan speed, compressor output) for balanced cooling and energy efficiency; B/P at 0.245MPa shuts down to avoid 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-350, 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.
