Gasboy Atlas Start-up - Manual (Page 189)

MDE-4334D Atlas™ Start-up and Service Manual · July 2013 Page 6-69
Valves Hydraulic/Mechanical Components
4 Use UL-approved sealant (as required) while replacing the valves.
Note: Do not use Teflon tape.
5 Clean the valve area. Do not introduce contamination.
6 Install valves with the flow arrow in proper direction.
Note: Two-stage valve torque specifications on Hexagonal Head bolts is 130+/- 10-inches lbs.
Meter Check Valve
This section explains about servicing the meter check valve.
Figure 6-35: Check to Meter Orientation
O-ring
Solenoid Valve and
Filter Manifold
Check Valve O-ring
Meter
Potential Problems
Following are the potential meter check valve problems:
• Damage to hydraulic parts can occur from thermal expansion or driving over a hose, if the
valve is inoperative.
• If a valve sticks open, a sale may register when you first turn the nozzle hook On with the
nozzle closed. Check STP check valves for problems.
• Stuck valve can cause reduced flow rates
• Leaks
• Calibration problems
Service Steps
Following are the steps for servicing the meter check valve:
• Check valves are not rebuildable. Replace any defective check valves.
• Wear eye protection while replacing any check valve.
To service valves, proceed as follows:
1 Close and test the shear valves for dispensers.
2 Shut off power to the unit and any involved STPs. Use OSHA lockout/tagout procedures.
3 Open the nozzle into an approved container to bleed pressure. Some residual pressure may
remain.