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Q:What does maximum close off pressure mean? My system will be fully pressurized at 35psi with a 50/50 glycol mix. Does the 10psi close off pressure of this unit pose any problems for me? Will the unit switch from A open to B open with out an issue when called upon?
A:The close-off rating of Honeywell valves means that if there is more than a 10 psi difference between the ports of the valve, the valve will not close. (Example #1: inlet of 25 psi and an outlet of 15psi (25-15=10) the valve will close. Example #2: inlet of 25 psi outlet of 5 psi (25-5= 20) the valve will not close). Please do not confuse this with the system pressure or the body rating of the valve. The close-off rating is the difference between the supply pressure and the return pressure when the valve is closed.
Q:Does this valve flow from ab to b when de-energized ,then from ab to a when energized?
A:Yes, it does. Please refer to page 4 of the owner's manual for more information. http://s3.pexsupply.com/manuals/1295367267056/44241_PROD_FILE.pdf