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AquFlow 900 - Diaphragm Metering Pump


Low Flow + High PSI + Highly Accurate

S900 - AquFlow Metering PumpsDesigned from the ground up for high pressure–low flow applications, AquFlow’s Series 900 is the lowest flow hydraulic diaphragm metering pump on the market, with flows down to 0.01 GPH (less than 40 mL/hr). Made in compliance with API 675, the Series 900 can pump flow capacities up to 6.5 GPH at pressures as high as 3,000 PSI.

Aquflow delivers customized chemical injection solutions for your choice of model depending on your application, whether it’s in oil & gas, pharmaceutical, food, or other chemical dosing industries. With a turndown ratio of 10:1, the Series 900 dosing pump delivers a chemical metering pump accuracy of ±1% with options for manual and auto capacity controls.

Like all AquFlow diaphragm dosing pumps, the Series 900 comes equipped with a built-in internal safety relief valve to prevent over pressurization. Its gear drive is fully enclosed and bathed in oil, reducing friction and protecting the internals of the pump from harsh environments. The metering pump diaphragm provides accurate controlled amounts of chemicals and require significantly less maintenance than peristaltic pump tubes. This low-maintenance and long-lasting design makes the AquFlow’s Series 900 positive displacement metering pump one of the most reliable and efficient low flow metering pumps. Complies with API 675 standards for positive displacement pumps.

Chemical Metering Pump Specifications

Flow CapacityUp to 6.5 GPH (Duplex)
PressureUp to 3,000 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

S900 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

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

Plastic Head: 140°F (60°C)
Plunger Stroke Length
Hydraulic Oil Capacity
Displacement Per Stroke (by plunger size)3/16″ 0.0207 cu. in. (0.33 ml)

⅜” 0.0828 cu. in. (1.35 ml)

¼” 0.0368 cu. in. (0.60 ml)
Liquid End Material Options316 SS, Alloy 20, Hastelloy C, PVC, PVDF and PTFE
Model Number
psi (bars)
DM3T 1929-0X0130.14 (0.53)3000 (206)293/16″1/4″Curves
DM3T 1958-0X0130.28 (1.06)3000 (206)583/16″1/4″Curves
DM3T 1997-0X0130.47 (1.78)3000 (206)973/16″1/4″Curves
DM3T 1912-0X0130.56 (2.12)3000 (206)1173/16″1/4″Curves
DM3T 1914-0X0130.67 (2.54)3000 (206)1403/16″1/4″Curves
DM3T 1917-0X0130.82 (3.1)3000 (206)1703/16″1/4″Curves
DM3T 2529-0X0130.24 (0.91)3000 (206)291/4″1/4″Curves
DM3T 2558-0X0130.49 (1.85)3000 (206)581/4″1/4″Curves
DM3T 2597-0X0130.82 (3.1)3000 (206)971/4″1/4″Curves
DM3T 2512-0X0131 (3.79)3000 (206)1171/4″1/4″Curves
DM3T 2514-0X0131.19 (4.5)3000 (206)1401/4″1/4″Curves
DM3T 2517-0X0131.44 (5.45)3000 (206)1701/4″1/4″Curves
DM3T 3829-0X0130.55 (2.08)3000 (206)293/8″1/4″Curves
DM3T 3858-0X0131.11 (4.2)3000 (206)583/8″1/4″Curves
DM3T 3897-0X0131.86 (7.04)3000 (206)973/8″1/4″Curves
DM3T 3812-0X01F2.24 (8.48)3000 (206)1173/8″1/4″Curves
DM3T 3814-0X0132.69 (10.18)3000 (206)1403/8″1/4″Curves
DM3T 3817-0X0133.25 (12.3)3000 (206)1703/8″1/4″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