Compac CNG Installation And Service Manual page 26

Scheduled Servicing
Checking the Isolation Ball Valve Sealing and Operation
Checking the Three Way Refuelling Valve Sealing and Operation
Check the Sealing of the Three-Way
Refuelling Valve
Check the Operation of the Three-Way
Refuelling Valve
Compac Industries Ltd.
Before you start, make sure you have:
 Soapy water
To check the operation of the isolation ball valve:
1. Close the inlet isolation valve.
2. Open the vent line valve and bleed the gas from the post.
3. Close the bleed valve once the hose is degassed.
4. Press the Start button. The pressure gauge should rise slightly. If it
continues to rise, the inlet valve is leaking.
5. Apply soapy water to the valve. If bubbles form, there is a leak in the
assembly or fitting. The fitting may require tightening or the seals might
need to be replaced.
6. To check the outlet valve, pressurise the post then close, the outlet
valve then the inlet valve and open the vent line valve. A pressure drop
will indicate an outlet valve leak. Go to step 5.
7. To check the vent line valve, pressurise the post and close the inlet
valve. A pressure drop will indicate a vent line valve leak. Go to step 5.
Before you start, make sure you have:
 Soapy water
To check the sealing of the three-way refuelling valve, apply soapy water
to the valve.
If bubbles form, there is a leak, in which case you should replace the
three-way refuelling valve seals.
To check the operation of the three-way refuelling valve, do a test fill to
check that the valve is filling the vehicle, and venting properly when you
disconnect it from the vehicle.
If bubbles form, there is a leak, in which case you should replace the
three-way refuelling valve seals.
Page 26
Servicing
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