Gasboy Atlas Start-up User Manual download pdf (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 bo

lts 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.

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Gasboy Atlas Start-up User Manual Page 189