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Help replacing a pressure reducing valve
I assume this pressure reducing valve is no good but can I replace it without draining my entire heating system (called drain down?)? The 3/4” pipe on the left is a return from the first or second floors and has no valve on it so if I remove the pressure reducing valve without draining the upper floors won’t water just gush out? The pipe to the right of it with the ball valve Is also a return from upper floors and I can isolate that with the valve
The cold water feed which I assume is the 1/2” pipe way right can be shut off. This is on a Dunkirk PvWB gas fired boiler. Any solutions besides drain down?