Gasboy Atlas Fuel Systems Installation Manual - Manual (Page 44)

Installation Connecting Vapor Return Line to Vapor Shear Valve
Page 6-14 MDE-4331M Atlas® Fuel Systems Installation Manual · September 2014
Connecting Vapor Return Line to Vapor Shear Valve
Do not create any liquid traps when connecting the vapor return line to the vapor line shear
valve (see
Figure 6-6 ). A liquid trap is a low place in the vapor return line that can accumulate
fuel and cause blockage, which can cause the system to fail the vapor recovery certification
tests.
Note: The contractor must provide and install the pipe union for connecting to the 1-inch NPT
coupling in the unit. Some regulatory agencies require shear valves or shear sections on
the vapor piping. Follow the guidelines and installation instructions from the vapor
shear valve manufacturer.
Figure 6-6: Correct Vapor Line Connection Method
Correct
Do not allow liquid traps
No place for liquid to
be trapped
Not Allowed
1-inch NPT Vapor Return Pipe
supplied in the Unit
Contractor-supplied
Fittings, Pipe, and Shear
Valve
Contractor-supplied
Fittings, Pipe, and
Shear Valve
Vapor Line Shear Valve