I have a standard (infrequent duty) temp/pressure relief
valve on a standard (electrically gutted) water heater piped
into my wood furnace. The tank regularly overheats when little
use is made of the abundant hot water, the relief being vented
to drain. After a year or so these valves start leaking, otherwise
the system is a godsend.
Does any one know of an industrial regular duty pressure
modulating relief valve that's designed for more or less
continuous or long-term duty (3/4" pipethread)? It should
preferably be similar, with a manual test/vent handle, and
be settable to whatever pressure 0-60psi.