Maximatic air-piloted valves are available in three-way and four-way configurations with port sizes from #10-32 thread to 1/2-in. NPT. The spool-type valves offer single or double air pilots and ...
Part 1 in this series covered defrost cycle problems in heat pumps. Now, let's discuss the second major winter issue: heat pumps stuck in one mode. The customer calls and says the system won't switch ...