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AquFlow 4000 - Diaphragm Metering Pump


3530GPH + 3500 PSI + Highly Accurate

4000 pump - AquFlow Metering PumpsNot many pump manufacturers can boast a range of flows that start at fractional GPH and go up to 3,500 GPH. The Series 4000 diaphragm metering pumps come at the top end of this impressive pump line. Built like a battle tank, this dosing diaphragm pump is made to withstand the most brutal working conditions one can expect a pump to perform in. It balances size and boldness with precision delivering flow consistence with less than 1% variation.

Like all other AquFlow chemical dosing pumps, this also complies with API 675 requirements. It retains all the most popular and proven design elements present in other smaller AquFlow series: a hydraulically balanced diaphragm, wear parts that all work under lubricating hydraulic oil to minimize wear and a modular design that is easy to operate, maintain and rework.

Corrosion resistance is not compromised with the liquid end available in chemical resistant materials such as 316 Stainless Steel, Alloy 20, Hastelloy C, PVC and PVDF. The metered pump also uses a disc valve which affords a larger opening to allow more viscous and some solids if needed.

Chemical Metering Pump Specifications

Flow CapacityUp to 3530 GPH (Duplex)
PressureUp to 3500 PSI
DesignModular design in aluminum housing
Metering Accuracy+/- 1%
Capacity ControlsManual/Auto
SafetyBuilt-in internal relief valve
AvailabilityDuplex or Double Flow Capacity
Liquid HandlingAble to handle difficult liquids like slurries, off-gasing, high viscosities

S4000 Dimensions



Flow Capacity Adjustment0–100% while the pump is running or stopped
Turndown RatioStroke Length 10:1

Stroke Frequency 10:1

Combined 100:1
Metering AccuracySteady State: ± 1%

Linearity: ± 1%

Combined: ± 1%
Max. Process Fluid Temp.Custom engineered metallic liquid end: 500°F (260C)

Metallic liquid end/PTFE diaphragm: 250°F (121°C)

Plastic Head: 140°F (60°C)
Plunger Stroke Length6″
Hydraulic Oil Capacity
Displacement Per Stroke (by plunger size)7/8″ – 2.2698 cu. in. (37.19 ml)

1-9/16″ – 7.6453 cu. in. (125.29 ml)

3″ – 28.1989 cu. in. (462.12 ml)

1-1/8″ – 3.8013 cu. in. (62.29 ml)

2-1/2″ – 19.63 cu. in. (321.77)

4″ – 50.34 cu. in. (824.99 ml)
Liquid End Material Options316 SS, Alloy 20, Hastelloy C, PVC, PVDF and PTFE

Performance Table

Model Number
psi (bars)
GNIT 0744-BC01A22.6 (85.55)3500 (241)447/8″1-1/2″Curves
GNIT 0770-BC01A36 (136.27)3500 (241)707/8″1-1/2″Curves
GNIT 0788-BC01A45 (170.34)3500 (241)887/8″1-1/2″Curves
GNIT 0714-BC01A72 (272.55)3500 (241)1407/8″1-1/2″Curves
GNIT 0944-BC01A39.2 (148.39)2000 (138)441-1/8″1-1/2″Curves
GNIT 0970-BC01A62.3 (235.83)2000 (138)701-1/8″1-1/2″Curves
GNIT 0988-BC01A78.4 (296.78)2000 (138)881-1/8″1-1/2″Curves
GNIT 0914-BC01A124.7 (472.04)2000 (138)1401-1/8″1-1/2″Curves
GNIT 1344-BC01F78.8 (298.29)1000 (69)441-9/16″2-1/2″Curves
GNIT 1370-BC01F125.35 (474.5)1000 (69)701-9/16″2-1/2″Curves
GNIT 1388-BC01F157.58 (596.51)1000 (69)881-9/16″2-1/2″Curves
GNIT 1314-BC01F250.7 (949)1000 (69)1401-9/16″2-1/2″Curves
GNIT 2044-BC01F202.4 (766.17)370 (26)442-1/2″2-1/2″Curves
GNIT 2070-BC01F322 (1218.9)370 (26)702-1/2″2-1/2″Curves
GNIT 2088-BC01F404.88 (1532.64)370 (26)882-1/2″2-1/2″Curves
GNIT 2014-BC01F644.1 (2438.18)370 (26)1402-1/2″2-1/2″Curves
GNIT 2444-BC01H291 (1101.55)295 (20)443″4″Curves
GNIT 2470-BC01H463 (1752.65)295 (20)703″4″Curves
GNIT 2488-BC01H582.19 (2203.83)295 (20)883″4″Curves
GNIT 2414-BC01H926.2 (3506.05)295 (20)1403″4″Curves
GNIT 3244-BC01H519.35 (1965.95)160 (11)444″4″Curves
GNIT 3270-BC01H826.24 (3127.66)160 (11)704″4″Curves
GNIT 3288-BC01H1038.7 (3931.91)160 (11)884″4″Curves
GNIT 3214-BC01H1652.4 (6255.01)160 (11)1404″4″Curves

Capacity Control Options

  • Dual Axis with both stroke length and stroke speed adjustable.


Stroke Length Controls

  • Manual: Standard on all pumps.
  • Electric: Electric stepper motor. Capable of 4-20mA input.
  • Pneumatic: Runs on 30 PSI air for hazardous environment.


Liquid Handling Options:


  • For liquids with suspended solids/slurries that may clog. Good for high viscosity liquids also.


Degassing Valve

  • Some challenging liquids can cause air locking due to off gassing. Our pump head with degassing valve ensures accurate and consistent pumping by letting our gas bubbles from the pump head.


Double Ball Check Valve

  • An added measure of assurance that you have the position valve shut off.


Tungsten Carbide Valve Balls

  • For abrasive liquids.


Leak Detection Options:

Leak Detection

  • There are two types of leak detection options available with AquFlow pumps.



  • Conductivity probe between 2 diaphragms to sense any break or rupture.



  • Uses a vacuum switch between 2 diaphragms to sense any rupture or failure.


Other Options:

Liquid Connections



Motor Options

  • Enclosure: TEFC, TENV, Explosion Proof, Washdown
  • Power Supply: ACV 115V, 230V, 380V, 460V, DC-12, 24, 90, 180, Single Phase, 3-Phase