MDE-4334C Atlas Start-up and Service Manual · April 2008
Page 7-67
Valves
Hydraulic/Mechanical Components
Rebuilding or Replacing
Labor cost for your area may determine your service philosophy. High labor costs favor parts
replacement. The difficult removal of a part from a unit favors a partial rebuild in the unit.
Gasboy recommends the following services for average or lower than average labor costs.
For Valves
Recommended Service
Less than two years old
Use a repair kit (replace spring, diaphragm, and O-Rings)
More than two years old or high usage
Replace the valve
To rebuild or replace a solenoid valve, proceed as follows:
1
Close and test shear valves for dispensers.
2
Shut off power to the unit and for any involved STPs in the dispensers. Use OSHA Lock-out/
Tag-out procedure.
3
Open the nozzle into an approved container to bleed of any pressure. Some residual pressure
may remain.
4
Check disconnected valve coils for continuity. If the coil is bad, replace the coil.
5
Replace any valves if they are defective.
6
Use a UL-approved sealant required for fuels while replacing valves. Do not use Teflon tape.
Teflon tape debris may cause the valve to malfunction.
7
Clean the valve area. Do not introduce contamination into the valve or piping.
8
Install valves with the flow arrow in the proper direction.
Service Tips
If no magnetic field or power exists, the following are the likely problems:
• Power from the valve driver board
• Cable problem
If power exists, the following may be the likely problems:
• Coil
• Valve body
