Advance Valve Product Information


Conbraco Series 18 Safety Relief Valve

Hot Water Boiler Safety Relief Valve

18 Series

Automatic temperature and pressure relief valves feature unique non-metallic coating which protects the element against galvanic and electromechanical corrosion by isolating it from the heated water. This coating is electrostatically applied for uniform coverage, then thermobonded, resulting in optimum adhesion for extended service life. CSA design certified at all setting to ANSI Z21.22. ASME Section IV rated at 125 psig and 150 psig settings for 3/4 NPT only


  • Meets HUD/FHA requirements
  • Cast bronze body, stainless steel spring
  • Rated 210°F maximum
  • CRN # OG26663, 1C registered in all Canadian provinces and territories
  • ASME capacity certified to 450,000 BTU/HR

MODEL # SIZE CSA Capacity BTU/Hr ASME Capacity
18C401 1/2" 15,000 n/a
(1" element)
3/4" 95,000 500,000
(3",8" element)
3/4" 105,000 500,000