View Full Version : 134a expansion valve question
g_norman
14-03-2006, 10:18 PM
what will be the outcome if an 134a expansion valve had been used to a r22 refrigeration system?
thanks!
Peter_1
15-03-2006, 09:53 PM
Nice intro.
Why, have you tried this or was the right valve not in stock?:D :p
Renato RR
16-03-2006, 03:57 PM
The outcome would be that compressor woud be unhapy and close to death.
Dont try that,
Renato
The valve doesn't really differentiate between refrigerants. But a particular valve will be rated at different tonnages or capacities that are tested by the manufacturer. For example, a 1 ton valve with R22 might become a 1/2 ton valve with R134a. R22 removes a lot more heat as one pound boils, compared to 134a. Thus, a one-ton R22 valve will have a smaller orifice than a one-ton 134a valve. Depending on the particular circumstance, you could likely wind up with an oversized valve, by at least 33%.
But the power head DOES differentiate between refrigerants. And the power head will not exert sufficient pressure to operate correctly. You have a chance of changing powerheads to make the oversized valve work properly, depending upon the valve's original range (for example, you are working with an already-undersized 134a valve), but a small chance of making it work with a 134a powerhead.
Oh! Your original question just came back into mind.
"what will be the outcome if an 134a expansion valve had been used to a r22 refrigeration system?"
You will overfeed liquid to the compressor.
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