Kunkle 189/363/389

Kunkle 189, 363 and 389 are heavy duty safety valves for cryogenic and liquefied air, oxygen and gas service — multi-stage air and gas compressors, intercoolers, aftercoolers and receivers, thermal expansion relief, and full rated capacity discharge on air, gas and liquefied gas lines. All three share a −320°F to 350°F range, FNPT connections in ½” or ¾” inlet with a ¾” outlet, a three-piece disc assembly with a PTFE seat and seal, and a control ring for precise blowdown adjustment. Choose by pressure and material: the 363 is bronze, 50 to 1,000 psig; the 189 is bronze, 1,000 to 2,500 psig; the 389 is all stainless steel and spans the full 50 to 2,500 psig. Relieving capacity runs 38 to 1,506 SCFM of air depending on set pressure. ASME Sections VIII and XIII with the ‘UV’ designator, National Board certified. Each model is available with a plain lift lever, a pressure-tight threaded cap for gas service only, or a packed lift lever — except the 389, which has no plain lever version.