The V46 direct-acting models open on an increase in pressure. Use models A, B, and C typically to regulate water-cooled condensers, and use the low flow D model typically in ice machines.
Commercial V46 valves are available in 3/8 in. to 2 1/2 in. sizes. You can use commercial all-range models from 3/8 in. to 1 1/2 in. with standard noncorrosive refrigerants.
V46 Series valves also come in models for Navy or maritime salt water applications. These valve bodies are of bronze construction, and any metal parts that come into contact with salt water are of nickel copper MONEL construction, which withstands the corrosive action of salt water.