3/4" Low Pressure Safety Relief Valve

Product Overview

The Apollo 13211B15 Steam Relief Valve is a low-pressure bronze safety relief valve designed for protection of steam, air, and gas systems operating at or below 15 PSIG. Engineered for dependable overpressure protection, this valve is constructed with a bronze body, brass stem trim, and TFE seat for reliable sealing and corrosion resistance under elevated temperatures. The 3/4-inch MNPT x FNPT connection allows for straightforward installation in commercial and industrial piping systems, ensuring safe operation of boilers, pressure vessels, and other low-pressure steam applications.

Technical Specifications

• Manufacturer: Apollo Valves (Conbraco Industries)
• Model Number: 13211B15
• Description: Bronze Low-Pressure Steam Safety Relief Valve
• Reference Number: 2081
• Nominal Size: 3/4 in (19 mm)
• Connection Type: Male NPT inlet x Female NPT outlet
• Body Material: Bronze (ASTM B584)
• Trim Material: Brass stem
• Seat Material: TFE (PTFE) for high-temperature sealing performance
• Set Pressure: 15 PSIG (factory preset and tested)
• Temperature Rating: Up to 250°F (121°C)
• Discharge Type: Open bonnet, suitable for steam service
• Flow Orientation: Vertical installation, direct discharge
• Overall Height: 3.27 in (83 mm)
• Operation: Direct spring-loaded relief mechanism
• Pressure Adjustment: Factory calibrated – non-adjustable in field
• Application:
  • Low-pressure steam boilers
  • Air, gas, or thermal fluid systems requiring 15 PSIG relief
  • Pressure vessels and heat exchangers
  • Commercial and industrial plant safety systems
• Performance Characteristics:
  • Accurate reseating with minimal leakage under cycling pressure
  • Corrosion-resistant internal components for extended service life
  • Compact design for confined installations
• Design Standards and Approvals:
  • Manufactured in accordance with ASME Section IV – Low Pressure Heating Boilers
  • National Board certified (UV stamped) where applicable
  • Complies with CRN and NB safety valve requirements
• Installation Requirements: Install vertically with discharge piping directed safely away from personnel or equipment; ensure piping supports do not impose load on the valve body.
• Maintenance: Periodic inspection and lift testing per ASME and local jurisdictional code requirements
• Finish: Natural bronze with machined connection threads
• Operating Mediums: Steam, air, gas (non-corrosive media)
• Country of Manufacture: United States

Summary

The Apollo 13211B15 Steam Relief Valve is a 3/4-inch bronze low-pressure safety valve rated at 15 PSIG and 250°F. Featuring a bronze body, brass stem trim, and TFE seat, it provides reliable overpressure protection for steam and air systems in commercial and industrial applications requiring code-compliant safety performance.