It is a 3/4 inch valve, and on the tag it has (NO. M335) and the BTU's are 510,000. The new valve has, model M 3/4 inch 374A ,,,, for SET it is 30 PSIG,,, and for BTU's it has 550,000. Is it ok to replace the old leaky valve with this one. When I replace this valve which of the water lines should I turn off. Please help and Thank You.
==== you should be able to shut off the water that is flowing into the boiler [[[ at the boiler -- if there is no shut-off then you will want to consider that addition for safety]]]... then you can remove the Pr Relief Valve .... go to the hardware giant
maximum warm water structures have a type tank it is made to absorb the version in quantity interior the water whilst it is heated. some are a bladder sort tank and a few are purely closed tanks on occasion placed between the beams interior the celling. A tank sort merely must be emptied to make certain an air lock. in case you close up off the feed of unpolluted water and open or take off the drain valve on the tank it is going to empty right into a bucket. close all of it up and the air trapped interior the tank will take in sufficient enlargement. you're able to do comparable with a bladder tank.
It is not the valve. Your expansion tank is either flooded or the bladder type one is shot. When the water heats up it needs to expand but cannot when the tank is full or bad, so the tp valve drips to relieve the pressure. Once the problem is corrected then it would be a good idea to replace the valve.
