Materials
Body: clear anodized aluminum
Bonnet: powder-coated aluminum
Cap: powder-coated aluminum
Spring: stainless steel
Poppet: hard-coated aluminum
Screw: hard-coated aluminum
Poppet Seal: Nitrile
Operation
The 199ASV installs on the top of an aboveground storage tank with a suction rod on the inlet and the fuel supply line (to a remote pump) on the outlet of the valve.
A poppet in the valve remains normally closed, isolating the tank from siphoning. When the remote pump is activated, it overcomes a factory-adjusted spring set to a predetermined hydrostatic head pressure and allows flow of fuel out of the AST.
An internal pressure relief valve helps absorb thermal expansion in the fuel supply line.