SHK-300: Triple Pressure Control & Dual-Refrigerant AC Pressure Switch
This SHK-300 is a high-performance AC pressure protection solution engineered for all vehicle types, supporting both legacy and modern systems with triple pressure control and dual refrigerant compatibility.
| Category | Specification |
| Model Number | SHK-300 |
| Thread Size | 3/8-24UNF Male (Customizable) |
| Operating Pressure | HP OFF: 2.94MPa (Overpressure Protection) |
| MP ON: 1.77MPa (Medium Pressure Activation) |
| LP OFF: 0.177MPa (Underpressure Protection) |
| Refrigerant Compatibility | R12; R134a (Customizable) |
| Vehicle Fit | All Vehicle Models |
| Customization | Thread, Pressure Thresholds, Refrigerant |
It integrates seamlessly with standard AC pipelines via the 3/8-24UNF Male thread, an industry-common fitting that eliminates adapter needs. The triple pressure control mechanism ensures all-round protection: HP OFF at 2.94MPa prevents compressor overheating and pipeline rupture, MP ON at 1.77MPa maintains stable cooling performance, and LP OFF at 0.177MPa avoids damage from refrigerant deficiency. Dual R12/R134a compatibility suits classic and modern vehicles, while customization options cater to special configurations.
Superior Quality & Reliability Engineering
Quality is foundational to the SHK-300, with design and testing meeting strict automotive industry standards. 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 R12 and R134a ensure leak-proof performance, while the durable contact design passes over 100,000 pressure cycle tests—validating long-term reliability for the vehicle’s lifecycle.
Every unit undergoes rigorous quality inspections, including pressure threshold verification, leak testing, and temperature endurance trials. Batch production records and customization specs are fully traceable, backed by an 18-month warranty, providing confidence for users and partners.
