Kunkle steam relief valve with a 3" 250 psi flanged inlet x 4" NPT female side outlet. This valve can be set from 10 to 250 psi pressure with a 5,671 to 48,693 psi per hour capacity. Please state operating pressure when ordering. Kunkle 6252 series steam relief valves are used on steam boilers. These cast iron body with brass trim valves offer side outlet and semi-nozzle trim with steam pressures from 10 to 250 psi and 250°F.