On certain heating applications I have to install a normally open Or normally closed valve ( NO or NC) depending on wiring and job requirements and type of heat.
Rather then try to educate the non knowing “plbg & heatin” guys ILL just give you the name of good manufacturers of Bronze body valves and you can explain exactly your requirements and let them know what voltage you want to use.
My personal choice is either Leslie Valves or McDonnell & Miller.