R448 Danfoss TX Valves

Danfoss TXV R448A Thermostatic Expansion Valve

Looking to upgrade your refrigeration system or replace an old valve? The Danfoss TXV R448A is the go-to choice for Aussie fridgies and HVAC technicians handling modern refrigerants. As the industry moves away from older gases like R404A, this valve ensures your system stays efficient, compliant, and reliable.

Whether you are working on a walk-in cool room, a freezer, or a supermarket display case, this thermostatic expansion valve gives you precise control. It is engineered to handle the specific pressure and temperature characteristics of R448A and R449A, helping to protect your compressor and keep energy bills down.

Best for: Licensed HVAC technicians, refrigeration mechanics, and maintenance teams working on commercial retrofits or new installs.

Compatible with: Systems running R448A (Solstice® N40), R449A (Opteon® XP40), and selected R407A/F models. Great for retrofitting R404A/R507 systems.

Features

• Ready for Low-GWP Gases: Specifically tuned for R448A and R449A, taking the guesswork out of your retrofit jobs.
• Built Tough: Features a laser-welded stainless steel power element. This means the diaphragm lasts longer and is highly resistant to corrosion and leaks.
• Fast Reaction: The special bulb design senses temperature changes quickly. This keeps your superheat stable, even when the load on the fridge changes suddenly.
• Adjustable Superheat: Comes with a static superheat setting that you can easily fine-tune to match your evaporator's needs.
• Bi-Flow Ready: Many models in this range work in both directions, which is a massive plus for heat pump applications (check specific model code).

Technical Specifications

• Brand: Danfoss
• Valve Type: Thermostatic Expansion Valve (TXV)
• Refrigerant Compatibility: R448A, R449A, R407A/F
• Max Working Pressure: Up to 45.5 bar (660 psig)
• Body Material: Brass body with Stainless Steel power head
• Capillary Tube Length: 1.5m (Standard)
• Connections: Flare x Flare or Solder x Solder (ODF) - check selection
• Equalisation: Internal or External options available

What's in the Box

• 1 x Danfoss TXV R448A Valve Body
• 1 x Bulb Strap (Standard mounting clip)
• 1 x Installation & Adjustment Guide

Why "Fit and Forget"?

Danfoss describes these valves as "Fit and Forget" reliability. Here is why that matters for your business:

• Fewer Call-backs: Once it's set, it holds the superheat accurately. You won't be driving back to the site next week to tweak it.
• Leak Prevention: The stainless steel laser welding eliminates the most common leak points found in older style valves.
• Future Proof: Installing this now means the system is ready for current environmental regulations, saving the customer money in the long run.

Using Your Danfoss TXV: Step-by-Step

1. Safety First: Ensure the system is electrically isolated. Recover existing refrigerant according to ARC regulations.
2. Remove Old Valve: Unbraze or un-flare the existing valve. Clean the pipework thoroughly.
3. Install New Valve: Fit the new Danfoss TXV. Important: If brazing, wrap the valve body and power element in a wet rag to prevent overheating the seals.
4. Mount the Bulb: Secure the sensing bulb to the suction line at the 4 o'clock or 8 o'clock position. Ensure the pipe is clean for good thermal contact. insulation is recommended.
5. Leak Check & Evacuate: Pressure test with nitrogen, then pull a deep vacuum to remove moisture.
6. Charge & Adjust: Weigh in the correct refrigerant charge. Run the system and adjust the superheat screw if necessary to meet the target superheat.

Limitations & Safety Notes

• Trade Use Only: This product must be installed by a licensed refrigeration mechanic (ARC License required in Australia).
• Heat Sensitivity: Do not overheat the valve body or bulb during installation. Permanent damage will occur.
• Check Glide: When using R448A/R449A, be aware of the temperature glide when measuring superheat (use Dew Point).
• Model Check: Verify if your system requires Internal or External equalisation before ordering.

Shipping & Returns

We ship Australia-wide, from capital cities to regional areas. We know you need parts fast to save stock. For dispatch timeframes, delivery info, and return steps, please see our Shipping & Returns page.

Danfoss TXV R448A FAQs

Can I use this valve to retrofit an R404A system?

Yes, these valves are designed specifically for R448A and R449A, which are common replacements for R404A. However, you must check that the rest of your system (oil, seals, compressor) is also compatible with the new gas.

Does this valve come with the orifice?

Most Danfoss TE2/TE5 style bodies require a separate orifice assembly (sold separately). For T2 or complete fixed-orifice valves, the orifice is built-in. Please check the specific drop-down option or product code title.

How do I adjust the superheat?

There is an adjustment spindle on the side of the valve. Turning it clockwise usually increases superheat, and counter-clockwise decreases it. Always make small adjustments (quarter turn) and wait 15 minutes for the system to stabilise.

Is the bulb strap included?

Yes, a standard bulb strap is included in the box to ensure tight contact with the suction line.

Why Buy From HVAC Shop?

• Aussie Owned & Operated: We understand the local trade and conditions.
• Fast Shipping: We aim to get your parts out the door same-day where possible.
• Real Support: Need help selecting the right size? Our team is here to help.
• Secure Checkout: Order online with confidence.

Want the complete setup? Shop our Refrigeration Valves range for solenoids, check valves, and coils to finish the job.