Adjustable Thermostatic Auto AC Expansion Valve Internal Equalizer Brass Body R134a R22 R407C Universal TXV

The WNRLN TXV-ATR22 is a versatile adjustable thermostatic expansion valve built on a forged brass body platform with an internally equalized design. Unlike fixed-setting TXVs that are locked to a single superheat calibration point, the ATR22 incorporates an external adjustment stem that allows field technicians to fine-tune the static superheat setting anywhere within a 3 K to 8 K range, accommodating diverse evaporator designs, varying refrigerant charge levels, and specific system performance requirements. This adjustability makes the valve a universal service solution for the professional AC technician who encounters a wide range of vehicle makes, models, and refrigerant types during daily diagnostic and repair operations. The forged brass body provides the thermal mass and conductivity required for consistent sensing bulb response, while the precision-ground valve seat and needle assembly ensure bubble-tight shutoff during the off-cycle to prevent liquid refrigerant migration into the compressor suction line.

The tri-refrigerant power element charge formulation is specifically engineered for stable superheat control across R134a, R22, and R407C refrigerants, providing a single valve platform that covers legacy R12-to-R134a retrofits, commercial transport refrigeration using R22, and newer R407C installations in light commercial and off-highway equipment. The internal equalizer design simplifies installation by eliminating the external capillary tube and its associated routing and leak-point concerns, making the ATR22 particularly well-suited for retrofit applications where the original evaporator may not have an external equalizer connection port. The adjustable stem features a Teflon packing seal that maintains leak integrity across hundreds of adjustment cycles, and a tamper-resistant cap prevents unauthorized changes after final commissioning. Each valve is individually flow-calibrated on a multi-refrigerant test bench and shipped with a calibration certificate documenting the as-shipped superheat curve for R134a, R22, and R407C.

• Field-Adjustable Superheat (3 K to 8 K): The external adjustment stem enables precise superheat tuning for specific evaporator characteristics without valve replacement, dramatically reducing service callbacks for incorrect TXV sizing or calibration.
• Tri-Refrigerant Compatibility (R134a, R22, R407C): The specially formulated power element charge maintains linear superheat response across three distinct refrigerant families, providing a single valve solution for diverse service fleet requirements.
• Forged Brass Body with Precision Valve Seat: Solid brass construction machined to sub-micron seat flatness tolerances ensures bubble-tight shutoff during compressor off-cycles, preventing liquid slugging at startup and protecting compressor reed valves.
• Internally Equalized for Simplified Installation: Eliminates the external equalizer capillary tube and its associated leak points and routing complexity, ideal for retrofit applications and space-constrained under-dash installations.
• Teflon Packing Adjustment Seal: The adjustment stem seal maintains leak integrity through hundreds of tuning cycles, with a tamper-resistant cap that prevents unauthorized adjustment after professional commissioning.
• Multi-Refrigerant Flow Calibration: Each valve is individually characterized on a test bench that verifies capacity and superheat control across the full operating range of all three supported refrigerants.
• Selectable Orifice Sizes: Available in No. 0 through No. 4 orifice configurations to match specific system capacity requirements from 0.5 TR to 5.0 TR, ensuring optimal refrigerant distribution across diverse evaporator sizes.

The TXV-ATR22 adjustable expansion valve is designed for professional AC service technicians, commercial transport refrigeration specialists, and mixed-fleet maintenance operations that encounter a wide variety of system configurations and refrigerant types. In automotive applications, the valve serves as a universal replacement for fixed-setting TXVs on passenger cars and light trucks that have undergone R12-to-R134a retrofits, where the original valve calibration may no longer be optimal for the replacement refrigerant. In the light commercial and off-highway equipment segment, the tri-refrigerant capability supports skid steer loaders, agricultural tractors, mining equipment, and construction machinery that may use R22 or R407C in their cab climate control or operator comfort systems. Bus and coach HVAC systems, which often employ large evaporator coils with unique superheat requirements, benefit from the adjustable superheat range that allows technicians to dial in the exact setting for optimal cooling capacity and compressor protection. The valve is also suitable for refrigerated van and truck transport applications where evaporator load varies dramatically between frozen and chilled cargo temperature setpoints. For refrigerant wholesalers and HVAC parts distributors, the TXV-ATR22 reduces the number of distinct TXV part numbers required in inventory by covering three refrigerant families with a single adjustable platform.

Each TXV-ATR22 adjustable expansion valve is individually sealed in an anti-static, moisture-resistant blister tray with integrated desiccant pack to protect the precision-machined sealing surfaces and adjustment mechanism from environmental contamination. The valve is packaged in a WNRLN-branded color box with clear window panel that displays the adjustment stem and model identification, along with a QR code linking to the unit-specific multi-refrigerant calibration certificate. An installation and adjustment guide is included in each box, providing step-by-step superheat tuning instructions for each supported refrigerant type. Master cartons are constructed from export-grade triple-wall corrugated board with custom die-cut foam inserts that secure each valve independently, eliminating the potential for contact damage during containerized sea or air freight. Our ISO 9001:2015 certified quality management system maintains full traceability from brass forging heat lot, power element production batch, and calibration bench data through to the individual valve serial number. Each valve undergoes a 100% helium leak test of the power element assembly, dynamic flow characterization at multiple evaporator temperatures and pressure differentials, and final dimensional inspection against the engineering drawing package. A 24-month warranty covers manufacturing defects, supported by a dedicated technical support team providing fitment guidance, superheat tuning consultation, and field troubleshooting assistance. OEM private labeling and custom calibration programs are available for qualified volume buyers.