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Twin pipe installation Single pipe installation (remove the
by-pass plug “P”)
A Closed by-pass solenoid valve
B Opened by-pass solenoid valve
C Opened cut-off solenoid valve
D Closed cut-off solenoid valve
1 Manometer plug
2 To nozzle
3 Shaft seal
4 Return to suction
5 By-pass plug
6 Return (twin pipe installation)
7 Suction (twin pipe installation)
8 Vacuum gauge plug
9 Gear
10 Hi-pressure regulator with control screw
11 Lo-pressure regulator with control screw
Oil under suction
By-passed oil returned to
tank or to suction
Oil under pressure
APPENDIX