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Suntec Industries Inc

OSV50 - Webster - OSV50 BIO Oil Safety Valve

OSV50 - Webster - OSV50 BIO Oil Safety Valve

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The Webster OSV50 BIO Oil Safety Valve is a critical safety component designed to protect oil‑fired heating systems from fuel spills, siphoning, and excessive inlet pressure. Installed close to the burner, this valve automatically controls oil flow by requiring a sustained vacuum from the burner fuel pump in order to open—shutting off fuel immediately if a line break, leak, or loss of vacuum occurs.
The OSV50 BIO isolates the burner fuel unit from upstream pressure sources such as supply pumps or overhead tanks, helping prevent damage to pump seals and reducing stress on inlet components. This design also ensures compliance with NFPA requirements, which limit inlet pressure at the burner pump to 3 PSI when properly installed.
Built for modern fuel applications, the OSV50 BIO is compatible with biofuels (B20–B100) as well as No. 1 and No. 2 fuel oil, kerosene, diesel, and waste oil. Featuring 1/2" NPTF ports and rated for up to 60 PSI inlet pressure, it is suitable for a wide range of residential and commercial oil heating systems. The valve can be mounted in any orientation, with a recommended cover‑down position to minimize contamination.
Trusted by HVAC professionals, the Webster OSV50 BIO provides dependable automatic shut‑off protection and long‑term safety for oil‑burner installations.

Key Specifications

  • Manufacturer: Webster
  • Model: OSV50 BIO
  • Product Type: Oil Safety Valve
  • Port Size: 1/2" NPTF (Inlet & Outlet)
  • Maximum Inlet Pressure: 60 PSI
  • Fuel Compatibility: B20–B100 biofuel, #1–#2 fuel oil, kerosene, diesel, waste oil
  • Operation: Vacuum‑operated automatic shut‑off
  • Mounting: Any orientation (cover‑down recommended)
  • Compliance: UL Listed; NFPA compliant when properly installed
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