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Posted by Harold Kestenholz - hydronic.net on May 23, 2002 at 12:05:18:
In Reply to: Check Valves posted by Tony Conner on May 23, 2002 at 06:25:55:
I like the suggestion. If the check valve is small enough to offer a back pressure, similar to an orifice, increased pressure on the pump side prevents flashing by raising the boiling point before the check valve so the valve will not be forced back against the seat - as a bubble of steam on the pump side will be less likely to form in the higher pressure zone. The balance is to have enough pump pressure to overcome the reduced valve size and provide needed flow. This is refrigeration technology at high temperatures.