If you're looking for a threaded bronze check valve the Art384 bronze swing type check valve from Albion is a worthy choice, we offer the complete range online which includes sizes between 1/2" and 2". All Albion Art 384 check valves come with a swing type closing mechanism, female BSPT taper threaded ends to the ISO 7/1 as well as a bronze body and disc.
These check valves have been manufactured to the BS EN 12288:2010 standard which was previously known as BS 5154, they also have a 20 bar (PN20) pressure rating and can be used at temperatures of up to 180°C.