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How to repair or replace these two stuck valves?
Greetings! Attached are two pics of a portion of the supply side of my boiler manifold. No laughing at my old Mr. Pex actuators, all of which work perfectly! The bottom two circuits (1&2) are controlled by one thermostat. The top two (3&4) by a different thermostat. As you can see, all four actuators responded to a call for heat and opened fully. After removing the actuators, you can see that only valve 2 & 3 are open, while 1 & 4 appear to be stuck shut. BTW, all have been operating perfectly for 12 years so far. What is my next move here to repair/replace these two stuck valves? The company I ordered all of this equipment from is long ago defunct, so I need a source, what to ask for, etc. Do the valves match the actuators by brand or style, or is there a generic replacement that will work? This is one operation I haven't done before, so any advice or steps would help. Thanks up front!