Checking the AT Valve function with Sight Glass

For a better understanding of the AutoTrim valve behaviour, a sight glass is recommended. Find a sight glass suitable for the tool on ServAid.

Assemble the sight glass with the tube adapter between the AutoTrim valve and the tool.
Make sure that the valve stays closed when running the tool in the air.
Run the tool on a joint and make sure that the valve goes from closed to open position when the pulsing starts.

If the behavior in step 2 or 3 is not correct, the valve need to be adjusted or serviced, see Adjusting the Switch Point for the Auto Trim valve.