Especially developed for split air conditioning systems and heat pumps in which repeated coupling / decoupling of the stop valves is only expected sporadically (see technical data - up to 75 times)
The unique design enables the stop valves to be properly and correctly coupled without the use of torque wrenches and prevents inadvertant uncoupling.
Repeated coupling and decoupling without evacuation / refilling of components and without lengthy interruptions to the functions of the refrigerant and air conditioning systems.
Industrially manufactured flare connectors rule out errors during assembly and guarantee high reliability and minimal leakage rates.
Reduction of effort in case of guarantee or warranty or at the replacement of components.
Saving of time and technical equipment at installations of new facilities as well as at the maintenance.
Preventing the often complete refrigeration loss in case of an improper disassembly or maintenance by not certified persons or enterprises (cf. VO (EU) no. 517/2014).
The European standard 378 for refrigeration systems and heat pumps requires in part 2 a sufficient number of stop valves in order to reduce the risk of loss of refrigerant to a minimum. Companion valves of Generation I consist of a pair of mating self-closing stop valves. Their use reliably prevents the escape of refrigerants, especially during maintenance.
Generation I companion valves meet the requirements of Regulation (EU) No. 517/2014 on fluorinated greenhouse gases with regard to maximum permissible leak rates of up to 70 couplings and uncouplings.
Seals made of Hydrogenated Acrylonitrile Butadiene Rubber (HNBR) ensure a wide temperature range and good chemical resistance to refrigerants and refrigeration oils.
Male stop valves with SAE internal threads for flared joints with pressed-in copper sealing ring
and female stop valves with soldering sleeves for pipes with inch diameter.
1. On-off Valve
2. Brass material
3. 100% leakage testing
Materil: Brass
Seal ring: CR, HNBR, FKM
Process: Hot Punch/ CNC
Connection method: Thread
Type of refrigerant: R410A, R32, R22, Propane etc..
Size：1/4，3/8，1/2，5/8，3/4，7/8
The double union is specifically designed to simplify refrigeration and HVAC piping adjustments.
easier pipe length modification
simplified installation corrections
improved adaptability during retrofit projects
reduced need for pipe replacement
This flexibility helps installers handle unexpected on-site adjustments more efficiently.
The union-style design provides both sealing stability and maintenance convenience.
secure threaded connection
leak-resistant performance
convenient disassembly and reconnection
improved long-term servicing efficiency
Compared with permanent pipe joints, union connections greatly simplify future maintenance work.
The connector is manufactured using high-quality forged brass for reliable long-term operation.
excellent corrosion resistance
stable mechanical strength
resistance to pressure fluctuations
long operational lifespan
Brass remains one of the most trusted materials for refrigeration and fluid piping systems because of its reliability in changing environmental conditions.
Acting as a flexible connection point between refrigeration lines, the double union allows installers to adjust lineset length while maintaining a secure and leak-resistant connection. Its union structure makes assembly and disassembly far more convenient than permanent welded joints, especially during maintenance or future system modifications.
Inside the piping system, the connector allows refrigerant to continue flowing smoothly while supporting necessary layout adjustments. Instead of forcing technicians to redesign an entire piping route, the union creates a practical and efficient transition point within the system.
This flexibility becomes especially valuable in commercial HVAC projects, refrigeration maintenance work, and retrofit installations where installation conditions may change unexpectedly.
In addition to simplifying installation, the double union also improves serviceability. Maintenance technicians can disconnect and reconnect sections of piping more efficiently, reducing downtime and improving maintenance speed.