Pump Solutions Group Neptune Series 500 MODEL 481 THRU 547 - Manual (Page 31)

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APPENDIX
INTRODUCTION
The Neptune Series 500 “dia-Pump” is available with a special liquid end to handle higher viscosity liquids.
Model numbers of pumps are for example 515-VS-N3 or 535-VS-N3.
This liquid end, which is only available in 316SS, is different than the standard liquid end as the suction
valve, back up plate, and liquid head are modified to allow oversized porting to enable thick liquids to be
drawn into the pump on the suction stroke. All other parts of the pump are identical to the standard pump.
Note, the suction connection is directly up from below and the normal suction connection is plugged. The
pump must be elevated as the inlet connection is plugged. The pump must be elevated as the inlet
connection extends below the plane of the gear box seat.
Maintenance instructions are identical to the standard pump. The four parts which are different from the
standard unit are shown below.
SERIES 500-VS
HIGH VISCOSITY
Series 500V (High Viscosity)
Head Parts Drawing
C-003105
RECOMMENDED SPARE PARTS
FIG.
NO.
DESCRIPTION
QTY.
PART
NUMBER
533 Diaphragm 1 000200
539 Discharge Valve Assembly 1 000209
Check Valve Assembly 1 003117
538 Valve Cap O-Ring 2 100200
516 Sealing Plate O-Ring (Model 515) 2 100184
516 Sealing Plate O-Ring (Models 520, 522, 525) 2 100185
516 Sealing Plate O-Ring (Models 530, 532, 535, 537) 2 100186
516 Sealing Plate O-Ring (Model 547) 2 100244
549 Valve Seat O-Ring 2 100204
003139----Complete Spare Parts Kit, Includes Diaphragm and all O-Rings.