Maintenance
2722
−
2/A1
Winterthur Gas & Diesel Ltd.
1.3
Procedure
WARNING
Injury Hazard: The opening pressure of the injection valve is
400 bar to 500 bar. Do not put your fingers near the holes in the
nozzle tip. Fuel can go through your skin and cause dangerous
injury.
1) Start the test bench.
2) At regular intervals, use a master pressure gauge to do checks of the pressure
gauges on the test bench. If necessary, adjust the pressure gauges.
3) Read the data in the manufacturer’s instructions to set the pressure of the test
bench to 600 bar.
4) Push the INJECT BUTTON. Do a check to make sure that injection valve
operates correctly.
5) Do a check of the seating surface between the needle seat and the nozzle as
follows:
a) Keep the pressure in the test bench constant at approximately 400 bar.
b) Monitor the injection valve for 30 seconds. Look to see if calibration fluid comes
out of the nozzle.
6) Do a check of the opening pressure as follows:
a) Set the pressure to 350 bar, then push the INJECT button.
b) Make sure that no calibration fluid comes out of the nozzle.
c) Set the pressure to 500 bar, then push the INJECT button.
d) Make sure that calibration fluid comes out of the nozzle as a spray.
1.4
Results
1) For the correct function and to use an injection valve again, read the data below:
D
The opening pressure is between 350 and 500 bar, refer to the test above.
The opening pressure for new injection valves is approximately 400 bar.
D
For used injection valves, a pressure decrease of 30 bar is permitted.
D
Most of the calibration fluid will come out as a spray from the top set of holes
in the nozzle tip at the specified opening pressure.
D
At the end of an injection, no calibration fluid must come out of the nozzle.
2) If the injection valve does not operate satisfactorily, disassemble as given in
You must replace nozzle tips that have worn holes. It is possible, but not
recommended, to replace the nozzle tip with the needle installed. If it is necessary to
do this, do the procedure carefully.
Only the injection valve manufacturer, or an authorized company can repair or replace
nozzle holders, Intermediate plates and nozzle bodies that have unsatisfactory
sealing surfaces.
2016
Injection Valve: Checking, Dismantling and Assembling
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