Though the basic function of hydrant valves remains the same, depending upon application/ location/ code requirements, different designs and sizes are available. Typically, Hydrant inlets can be flanged or threaded (threaded being used for low pressure applications, typically upto 7 kg/cm2). Inlet sizes could vary from 100 NB (4”) size to 50NB (2”) size. Similarly outlets can be have instantaneous/ threaded/ storz couplings, and sizes can vary from 75 NB (3”) to 38 NB (1.5”).
Orientation of the outlet can also be different depending upon its mounting arrangement, with outlet angle varying from 90º (straight) to 45º (Oblique).