World News

Industry news and insights from Europe and around the World

UK News

Latest news and developments in the United Kingdom

Products

Keep up-to-date with the latest new products and technology

Features

General articles, applications and industry analysis

Weiss Technik approves Danfoss valve with low temperature R469A

GERMANY: Environmental test chamber manufacturer Weiss Technik has proven the long-term compatibility of Danfoss AKV expansion valves with its newly developed cryogenic refrigerant R469A.

The German manufacturer reports that it has successfully tested Danfoss AKV electronic expansion valves for use in environmental test chambers. Weiss tested the durability of the valves under sustained load and their resistance during operation with R469A, the refrigerant it developed as a replacement for R23 in very low temperature applications. 

Engineers at Weiss Technik saw potential for the AKV expansion valves in its environmental test chambers, in particular the valve’s long service life of 50 million switching cycles. The valves also enable fast and accurate temperature changes and and rapid changes in flow rate. Also, as the valve closes automatically when there is no power, a separate safety shut-off valve is unnecessary.

Weiss Technik initially conducted field trials on powerful units with cooling speeds of up to 25K/min. No valve-related failures occurred even after long run times.

Subsequent bench tests sought to establish whether the valves would meet the requirements of Weiss Technik’s climate chambers. The main requirements were: controllability with an accuracy of < ± 0.1K, quick adjustment after temperature changes; feasibility of temperature ramps, jumps and constant temperatures within tight tolerances; high number of switching cycles.

After an initial 12 million switching cycles without defects, 120 million switching cycles were subsequently tested.

The tests were carried out in systems of all sizes, from small units with a volume of 100 l to walk-in test cells with a volume of 21m3. The temperatures ranged from -85 °C to +200 °C. 

According to Weiss Technik, these loads had no effect on the valves. They showed no wear and maintained all parameters over the entire test period.

Related stories:

Low GWP option for low temp R237 June 2019
GERMANY: An environmental test chamber manufacturer has announced the development of a lower GWP alternative for R23, a specialist refrigerant used in low temperature refrigeration. Read more…

Latest News

20th February 2024

F-gas regulation published in Official Journal

EUROPE: The new F-gas regulation has now been published in the EU’s Official Journal, making it legally binding and entering into force in 20 days.
20th February 2024

Carrier Germany increases heat pump training

GERMANY: Carrier Germany is offering new hydraulics training courses  at its training centre on the IKKE campus in Duisburg to support the growing demand for heat pump expertise. 
20th February 2024

Oceanair acquired by builders’ merchant MKM

UK: Air conditioning and heat pump distributor Oceanair UK has been acquired by MKM, the independent builders’ merchant.
20th February 2024

Carrier to build factory and R&D facility in Saudi Arabia

SAUDI ARABIA: Carrier is to build an advanced manufacturing and R&D facility in Saudi Arabia in a partnership with Alat, a new Riyadh-based public investment fund company.
19th February 2024

BDN offers high level monitoring

IRELAND: The first installation of Bitzer’s Digital Network (BDN) in Ireland is providing high-level monitoring, system diagnostics and optimisation for an award-winning deli food specialist.
19th February 2024

Manchester receives heat pump training boost

UK: Daikin UK in partnership with the Green Skills Academy is to deliver the first heat pump training programme for college tutors and staff at nine Greater Manchester colleges.