N30 - Pressure Relief Valves for Well Systems
  Series N30 Pressure Relief Valves for Wells are used to protect against excessive pressures in well systems. It is not diaphragm actuated and is used for pressure-relief service only. Series N30 consists of a bronze body construction with NPT threaded male inlet and NPT threaded female (drain) outlet connections, and stainless steel spring. Pressure Range: 5 to 25psi (34.5 to 172.4 kPa). Model N30L has a test lever and a pressure range of 30 to 60psi (206.7 to 413.4 kPa) and a standard pressure setting of 30 to 45psi (206.7 to 310 kPa).
Size Range: 1/2 in. (15mm)