Redefining the 5hp 4-way reversing valve:

There is a common practice in the industry that when mentioning a 5hp (used for air conditioning/heat pump) 4-way reversing valve:, people tend to assume it's the SHF-20 valve. However, this usage carries significant risks. First of all, the backgound of selecting a 5hp with a SHF-20 valve can be traced back to the era of R22 refrigerant. But today, the use of R410A is already very widespread. Nevertheless the capacity of the compressor remains similar, the 4-way reversing valve's capacity has greatly increased. When using R32, the 4-way reversing valve's capacity is more than 50% higher than that of R22. 

In other words: The 5hp system is still of the same capacity, but the SHF-20 valve is way much oversized today.

Secondly, the compressor's heating capacity will be reduced drawmatically in low-temperature applications. Combining both factors, the problem of oversizing has become quite serious. If other aspects of the system design are not properly considered, it may lead to the clog(fail-to-swith) of 4-way reversing valve.

In other words: The SHF-20 valve is no longer the same as before, and the 5hp system is also different.

According to our continuous tracking of 4-way reversing valve market failures in recent years, fail-to-switch accounts for 80% of the total number of defects, and a large part of it is due to the mismatch between the system and the valve. Therefore, Sanhua launched the SHF-20GR 4-way reversing valve. We have redesigned the capabilities of the SHF-20GR valve, which can better match the 4~6hp system when used in R410A or R32 AC/heat pump systems.