Component Technical Manual TQM for Fuel Dispensers
Document Ref 942175-001 Rev 3 Page 2-7
Phase 1:
•The right hand (RH) piston is against the front stop
•The channels to chamber C and D are closed by the control valve
•The fuel flows into chamber A
•The left hand (LH) piston moves towards chamber B
•The fuel flows out of chamber B to the exit side
Phase 2:
•The channels to the chambers A, B, C and D are opened by the control valve
•The fuel flows into chambers A and C
•The pistons move towards chambers B and D
•The fuel flows from chambers B and D to the exit side
Phase 3:
•The LH piston is against the rear stop
•The channels to chambers A and B are closed by the control valve
•The fuel flows into chamber C
•The RH piston moves towards chamber D
•The fuel flows from chamber D to the exit side
Phase 4:
•The RH piston is against the rear stop
•The channels to chambers C and D are closed by the control valve
•The fuel flows into chamber B
•The LH piston moves towards chamber A
•The fuel flows from chamber A to the exit side
After phase 4, the LH and RH pistons reach the front stops one after the other and phase
1 starts again. The pistons’ movements can be adjusted at the front stops to achieve exact
values in accordance with the approval. Please refer to section 4 for the adjustment
instructions.
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