Gasboy Atlas Fuel Systems Site Prep Manual User Manual
Page 36
For the 9862 DEF dispenser, you must use the specified shear valve that is rated for
DEF (see
on
).
IMPORTANT INFORMATION
Site Preparation
Plumbing Requirements
Page 32
MDE-4333E Atlas Fuel Systems Site Preparation Manual · November 2011
A shear valve is a NFPA 30A required safety device. It closes automatically to stop product
flow during a fire or if the dispenser gets knocked off the island. It also provides a means of
manually closing inlet pipes.
Figure 3-5: Shear Valve
1-1/2-inch NPT Coupling on unit
Installing contractor supplied
black iron piping to coupling,
including union
Shear valve with shear point
installed flush with grade
±0.75-inch.
Follow shear valve manufacturer’s instructions for installation procedures, testing, and other
procedures.
• Install shear valve on each product inlet pipe.
Note: Gasboy strongly recommends using double-poppet shear valves that shut-off flow
from the tank and the dispenser (for example, OPW
®
#10BHMP, or
Exxon
®
- OPW # 10RMSP).
• Also, install a shear valve on master dispenser satellite outlet and at satellite inlet.
• Do not mount the shear valve upside down.
• Ensure that the valve linkage is accessible and has no interference to opening or closing from
other piping, structure, or components.
• Do not anchor shear valves at this time. For anchoring procedures, refer to MDE-4331
Atlas Fuel Systems Installation Manual.
Note: The dispenser product inlet pipes must be aligned with the shear valve. Do not
restrict shear valve linkage with pipes, braces, and so on.
• Test shear valve operation.
• Close shear valve until equipment start-up. Cap outlet pipe. This prevents dirt and other
particles from getting in the dispenser product line. It also prevents fuel spillage.
• Install a vapor return line where required. This can be done in two ways:
Install a flexible connector or shear section on vapor return pipes as required by
NFPA 30A to ensure the product side shear valves will operate correctly. Use 1-inch pipe
to connect vapor return pipes located inside pump/dispenser.
~ OR ~
Install 1-inch shear valve listed for use with vapor recovery lines. For Vapor Recovery
(Return) Lines, refer to MDE-4331 Atlas Fuel Systems Installation Manual.