Neptune 500 Series Hydraulic Diaphragm Metering Pump

Name: Neptune 500 Series Hydraulic Diaphragm Metering Pump
Brand: Neptune

Neptune 500 hydraulic diaphragm family (500-A/S/D/E, 560). Simplex ~0.8–94 gph (3–355 L/h), up to 3,000 psi (210 bar). Oil By-Pass™, ±1% accuracy.

Max flow

approx. 3 – 355 L/h (0.8 – 94 gph, incl. 560)

Max pressure

to 210 bar / 3,000 psi (500-S high pressure motor configuration)

Turndown / accuracy

±1% (rated flow 10%–100%)

Wetted materials

316SS / C-20 / PVC / PVDF (E series); diaphragm PTFE

Protection

—

Power

—

Inquire Now Download datasheetxiongxiaoyang55@gmail.com

Best for: verifying flow/pressure and control interfaces against your dosing duty (Metering Pump). Confirm chemical compatibility and install constraints before ordering — inquire for help.

Features

Hydraulically balanced PTFE diaphragm
Oil By-Pass™ variable oil stroke control
Simplex/duplex (500-S convertible to 500-D)
EZE-CLEAN™ cartridge valves (metal heads)
±1% accuracy from 10–100% of rated capacity
Optional ESC and double-diaphragm leak detection

Specifications

Flow (simplex)	approx. 3 – 355 L/h (0.8 – 94 gph, incl. 560)
Max pressure	to 210 bar / 3,000 psi (500-S high pressure motor configuration)
Accuracy	±1% (rated flow 10%–100%)
Wetted materials	316SS / C-20 / PVC / PVDF (E series); diaphragm PTFE
Drive	hydraulic diaphragm
Sub-series	500-A / 500-S / 500-D / 500-E / 560
Brand	Neptune (PSG Dover)

Applications

Water treatment

Chemical processing

Oil & gas

Boiler chemical feed

High-pressure injection

Materials & media

Wetted materials

316SS / C-20 / PVC / PVDF (E series); diaphragm PTFE

Common chemicals: NaOCl, acids, alkalis, polymers — confirm compatibility when inquiring.

Controls & communication

Control options are listed in notes or confirmed on inquiry.

Models & specs

Model	Flow	Pressure	SPM	Notes
500-A-N3/N4/N5	3 L/h (0.8 gph)	70 bar / 1,000 psi（PVC 11 bar）	—	500-A single head can double head; 37 SPM
515-A-N*	11.3 L/h (3 gph)	77 bar / 1,100 psi（PVC 28 bar）	117
520-A-N*	7.5 L/h (2 gph)	49 bar / 700 psi	37
522-A-N*	15.1 L/h (4 gph)	49 bar / 700 psi	72
525-A-N*	26.5 L/h (7 gph)	63 bar / 900 psi	117
530-A-N*	20.8 L/h (5.5 gph)	25 bar / 350 psi	37
532-A-N*	41.6 L/h (11 gph)	25 bar / 350 psi	72
535-A-N*	68.1 L/h (18 gph)	25 bar / 350 psi	117
500-S-N3	3 L/h (0.8 gph)	to 210 bar / 3,000 psi (1/2HP)	—	can double head 500-D
515-S-N3	11.3 L/h (3 gph)	to 125 bar / 1,800 psi	—
525-S-N3	26.5 L/h (7 gph)	to 105 bar / 1,500 psi	—
535-S-N3	approx. 68 L/h class	to 42 bar / 600 psi	—	selection see manual
560 series (single head)	151 – 355 L/h (40 – 94 gph)	to 24 bar / 350 psi (PVC/PVDF 11 bar)	—	large flow 560