What do displacement adjustment and motor speed control?

Mechanical adjustment changes the nominal volume delivered per complete revolution. Motor speed changes how many revolutions are completed per unit time. Estimate dose from displacement × revolution count and average flow from displacement × speed, then calibrate actual output.

How do the wash ports differ from the working-fluid ports?

Both use 1/4-28 UNF-2B threads in the shown configuration, but they serve different circuits. Working-fluid ports carry reagent into and out of the pump; wash ports rinse the piston area. Matching threads do not make them interchangeable. Follow the drawing for the supplied configuration.

How should accuracy, pressure and service-life values be used?

Confirm the definitions and test conditions, including liquid, temperature, displacement, speed and backpressure. A pressure rating is not automatically the permitted operating backpressure, and cycle life is not a guarantee under every condition. Valveless construction does not mean that a complete instrument needs no switching or shutoff valves.

FOREACH RPL-P6.35 valveless metering pump, front three-quarter view

RPL-P6.35 OEM Valveless Rotary Piston Pump for Laboratory Liquid Handling

Q: How should I choose between RPL-P6.35 and RPL-P4?

Their displacement ranges are 50–300 μL/rev and 12–80 μL/rev respectively. Start with the target dose and available time to estimate displacement and revolution count, then compare small-dose output and drive options. Greater displacement does not mean greater accuracy.

Q: Which materials and ports are shown for RPL-P6.35?

The shown configuration uses a polyvinylidene fluoride (PVDF) head and plug, a zirconium dioxide (ZrO₂) ceramic set, and 1/4-28 UNF-2B working-fluid and wash-fluid ports. Identical threads do not make the two circuits interchangeable. Check the reagent and cleaning liquid against all wetted components, not just the pump head. Confirm the drive, mounting and interfaces for the supplied configuration.

RPL-P6.35 is a single-head valveless ceramic piston metering pump with mechanically adjustable displacement from 50 to 300 μL/rev. It operates at 5–300 rpm over a flow range of 0.25–90 mL/min. Applications include reagent dispensing and sequential dosing in analyzers, titrant delivery, and volumetric filling of reagent tubes and small bottles.

Combined rotary and reciprocating piston motion handles suction, discharge and port switching without separate check valves. Mechanical adjustment changes the piston stroke and displacement per revolution; revolution count sets the calculated dose, and speed sets delivery time. For equipment handling several fill volumes, select a displacement that suits the required volume and cycle time, then calibrate delivery at that setting.

The configuration shown uses a polyvinylidene fluoride (PVDF) pump head and plugs with a zirconium dioxide (ZrO₂) ceramic piston and cylinder set. Process and rinse ports are both 1/4-28 UNF-2B. The separate rinse circuit allows the piston area to be flushed when handling salt-containing reagents or liquids prone to crystallization. Overall dimensions are 78 × 78 × 145 mm, with a weight of 750 g, for OEM integration into analyzers and automated laboratory dispensing modules.

Typical Applications:

Automated analyzers: reagent dispensing and staged dosing, Laboratory titrators: titrant delivery and dosing, Reagent filling systems: volumetric filling of tubes and small bottles

Model:Select a configuration

Product type	RPL Single-Head Valveless Metering Pump
Displacement per revolution	50–300 μL/rev
Speed	5–300 rpm
Accuracy	<2%
Repeatability	<0.5%
Pressure rating	Max 150 kPa
Service life	20,000,000 cycles
Pump head material	polyvinylidene fluoride (PVDF)
Plug material	polyvinylidene fluoride (PVDF)
Ceramic set	zirconium dioxide (ZrO₂)
Working-fluid port	1/4-28 UNF-2B
Wash-fluid port	1/4-28 UNF-2B
Overall dimensions	78 × 78 × 145 mm
Weight	750 g
Configuration	Custom configuration

Flow ranges are calculated from displacement per revolution and speed. Calibrate actual delivery with the intended liquid, backpressure and fluid circuit.

Displacement per revolution is not the dose or minimum reliable volume; verify actual output with the drive, liquid and circuit.

Accuracy, repeatability and life require the applicable test conditions. Confirm permitted working backpressure separately from the pressure rating.

Automated analysis and in vitro diagnostics: reagent dispensing

In automated analyzers and in vitro diagnostics (IVD) reagent circuits, liquid travels from a reagent bottle through the pump, tubing and dispensing tip into a reaction vessel. The component may be specified as a reagent dispensing pump or reagent dosing pump. Define the volume required by each analytical step and the time available to deliver it, not only the flow per minute.

Displacement and complete operating revolutions determine nominal dose volume. Calculation example: 100 μL/rev × 5 revolutions = 500 μL. At a constant 150 rpm, those revolutions take 2 seconds, excluding acceleration, stopping and other machine actions. This is a sizing calculation, not measured performance. Recalibrate output after changing the displacement setting.

Priming the working-fluid path and washing the piston area are different operations. Priming establishes a stable liquid column; the wash circuit addresses residue around the piston. For salt-containing or crystallizing reagents, select a compatible cleaning liquid and shutdown sequence. A wash port does not establish compatibility with every corrosive liquid.

Automatic titration: incremental titrant dosing

In laboratory titrators, a titrant dosing pump delivers liquid to the titration vessel under instrument control. The sequence combines an addition, mixing and electrode response, followed by the decision on the next addition. The pump supplies liquid; the instrument detects and determines the endpoint.

Specify initial delivery speed and the smallest reliable increment near the endpoint separately. At unchanged displacement and complete revolution count, reducing speed mainly increases delivery time, not dose volume. 50 μL/rev is the lower end of the displacement range, not a validated minimum titration increment. Do not infer arbitrary small doses by dividing it by motor steps.

Collect and measure repeated target increments with the actual titrant, tip and tubing. Check droplet carryover after stopping and leave time for mixing and stable readings. Drive positioning and start/stop behavior must support the required sequence; the pump accuracy specification alone is not the analytical accuracy of the complete titrator.

Reagent dispensing: microliter-to-milliliter filling stations

In repeated filling of reagent tubes and small bottles, RPL-P6.35 can be specified as a reagent filling pump or liquid dispensing pump. One fill may accumulate one or several complete operating cycles; its volume is not limited to the displacement of a single revolution. Coordinate delivery with container indexing and tip movement.

Calculation example: at 200 μL/rev, a nominal 1 mL fill requires 5 revolutions. At a constant 150 rpm, the theoretical pump running time is 2 seconds. Add indexing, tip motion and settling to obtain the station cycle. This calculation is not a verified filling rate or accuracy claim.

Test consecutive fills and restart fills using the intended tubing and tip, and inspect dripping and foaming. The polyvinylidene fluoride (PVDF) head and zirconium dioxide (ZrO₂) ceramic set must be checked against the reagent and cleaning liquid together with fittings, tubing and all other wetted components.

Define the fluidic task and configuration

Provide liquid composition, dose volume or continuous flow, allowable delivery time, daily run duration, inlet conditions, outlet backpressure and drive requirements. Use these inputs to size displacement and timing, then verify output in the actual circuit. Application directions are not claims of validation in every listed instrument.

Preview DrawingView the technical drawing for RPL-P6.35.

Download RPL-P6.35 / RPL-P15 (English, 001 / 2025-07) PDF

Preview RPL-P6.35 / RPL-P15 (English, 001 / 2025-07) Datasheet

Frequently Asked Questions

Their displacement ranges are 50–300 μL/rev and 12–80 μL/rev respectively. Start with the target dose and available time to estimate displacement and revolution count, then compare small-dose output and drive options. Greater displacement does not mean greater accuracy.

The shown configuration uses a polyvinylidene fluoride (PVDF) head and plug, a zirconium dioxide (ZrO₂) ceramic set, and 1/4-28 UNF-2B working-fluid and wash-fluid ports. Identical threads do not make the two circuits interchangeable. Check the reagent and cleaning liquid against all wetted components, not just the pump head. Confirm the drive, mounting and interfaces for the supplied configuration.

Confirm the RPL-P6.35 configuration for your instrument

Submit requirements

Product type

RPL Single-Head Valveless Metering Pump

Displacement per revolution

50–300 μL/rev

Speed

5–300 rpm

Accuracy

<2%

Repeatability

<0.5%

Pressure rating

Max 150 kPa

Service life

20,000,000 cycles

Pump head material

polyvinylidene fluoride (PVDF)

Plug material

polyvinylidene fluoride (PVDF)

Ceramic set

zirconium dioxide (ZrO₂)

Working-fluid port

1/4-28 UNF-2B

Wash-fluid port

1/4-28 UNF-2B

Overall dimensions

78 × 78 × 145 mm

Weight

750 g

Configuration

Custom configuration

Confirm the RPL-P6.35 configuration for your instrument

RPL-P6.35 OEM Valveless Rotary Piston Pump for Laboratory Liquid Handling

Typical applications

Automated analysis and in vitro diagnostics: reagent dispensing

Automatic titration: incremental titrant dosing

Reagent dispensing: microliter-to-milliliter filling stations

Define the fluidic task and configuration

Frequently Asked Questions

Confirm the RPL-P6.35 configuration for your instrument

RPL-P6.35 OEM Valveless Rotary Piston Pump for Laboratory Liquid Handling

Typical applications

Automated analysis and in vitro diagnostics: reagent dispensing

Automatic titration: incremental titrant dosing

Reagent dispensing: microliter-to-milliliter filling stations

Define the fluidic task and configuration

Frequently Asked Questions

Confirm the RPL-P6.35 configuration for your instrument