OPW 178S Series Ductile Iron External AST Emergency Shut-Off Valve

2 in.
Ductile Iron
5.40 LBS
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The OPW 178S Series External AST ShutOff Valve is designed to shut off product flow from an aboveground storage tank, bulk loading rack or any place in the fuel supply line in the event of a fire. The 178S installs inline on fuel supply piping. A fusible link attached to a springoperated lever holds the poppet normally open. In the event of a fire, the fusible link melts at 160°F, allowing the springactuated poppet to shut off the flow of product in the fuel supply line. The 178S is available in 2" female NPT connections.


  • Manufactured from a ferrous metal to resist fracturing from high temperatures
  • Maximizes flow rates in the fuel supply lines
  • Main poppet seal is held out of the main flow stream and protected from damage due to dirt or debris in the fuel
  • Ensures full seating of the main poppet for a tight seal
  • Compatible with gasoline, diesel, kerosene, ethanol, methanol, MTBE, fuel oil, mogas, motor oil and various other blends of fuel
  • Rated At Normal Pressure Limit of 125 psi (8.6 bar) (cold)
  • NonShock Pressure Limit of 200 psi (13.8 bar)
  • Temperature Limit 225° F

Construction Details

  • Body and Cap: Ductile iron
  • Packing Nut and Stem: Stainless steel
  • Disc: Viton®
  • Stem Seat: Viton®
  • Seat Ring: Brass
  • Cap and Packing Nut Seals: Viton®