Positive Displacement Flow Meter: Comprehensive Product Guide

Introduction to Positive Displacement Flow Meter

A Positive Displacement (PD) Flow Meter is a precision instrument designed to measure the volumetric flow of liquids with exceptional accuracy. Unlike turbine or electromagnetic flow meters, PD flow meters operate on a volumetric principle, measuring the exact volume of liquid passing through the chamber.

This makes them highly suitable for industries handling oil, fuel, lubricants, chemicals, food-grade liquids, and other viscous fluids. With robust construction and long service life, PD flow meters are widely applied in petrochemical plants, pharmaceutical production, water treatment, and industrial automation systems.

Working Principle of Positive Displacement Flow Meter

The PD flow meter works by dividing the fluid into fixed, known volumes. Each rotation or displacement of the internal measuring component (such as a piston, gear, or rotary vane) corresponds to a precise liquid volume. The meter counts the number of displacements to calculate the total flow.

Key advantages of PD technology include:

• High measurement accuracy (±0.2% to ±0.5%)

• Stable readings regardless of viscosity or density

• Works effectively at low flow rates where other meters may fail

• No requirement for a straight pipe run upstream or downstream

Technical Specifications

Product Performance

1. Accuracy and Repeatability

The PD flow meter is capable of delivering high accuracy independent of fluid viscosity, density, and temperature. Its repeatability ensures consistent measurement, making it ideal for custody transfer and quality control applications.

2. Pressure and Temperature Resistance

Designed with robust housings and precision internal components, the meter can withstand high pressure systems and operate in varying temperature conditions.

3. Durability and Reliability

With fewer moving parts and high-quality seals, the PD flow meter ensures long-term performance with minimal maintenance requirements.

Cleaning Methods

Proper cleaning ensures accurate measurement and extends the lifespan of the meter.

Routine Cleaning

• Flush the meter with clean water or a compatible solvent after transferring viscous or sticky fluids.

• Use low-pressure cleaning to avoid damaging internal components.

• Always ensure the cleaning medium is compatible with the materials of construction.

Deep Cleaning (Periodic)

• Disassemble the meter as per the manufacturer’s instructions.

• Clean internal chambers, gears, or pistons with a non-abrasive cleaning agent.

• Dry components thoroughly before reassembly.

Special Considerations

• For food-grade applications, use sanitary cleaning agents approved for contact with edible products.

• For chemical applications, neutralize the fluid residues before cleaning.

Maintenance Frequency

Regular maintenance enhances performance reliability and prevents unexpected failures.

Daily/Weekly Checks

• Inspect for leakage at connections and seals.

• Monitor accuracy by comparing readings with reference meters.

• Ensure the fluid is free from large particles that may damage the chamber.

Monthly Maintenance

• Verify calibration accuracy and adjust if required.

• Inspect moving components such as gears, pistons, or vanes for wear.

• Apply lubrication if specified by the manufacturer.

Annual Maintenance

• Conduct a full performance inspection under actual working conditions.

• Replace worn seals, gaskets, or internal components.

• Perform calibration against a certified flow standard.

Packaging Information

To ensure safe handling and global transport, each Positive Displacement Flow Meter is securely packaged.

Packaging Details

• Strong wooden crate or carton box, depending on model size.

• Foam or anti-shock protection inside the packaging.

• Moisture-proof wrapping for sea shipments.

• Labeling includes model number, specifications, serial code, and safety handling symbols.

Shipping Options

• Available by air freight, sea freight, or express courier.

• Export packaging complies with international shipping standards (ISPM-15).

• Customized branding and bulk packaging available for B2B distributors.

Advantages of Positive Displacement Flow Meter

• High accuracy and repeatability independent of fluid viscosity.

• Robust design suitable for high-pressure and high-viscosity applications.

• Simple operation and low maintenance requirements.

• Versatile installation without the need for long straight pipe runs.

• Wide industrial applications, from fuel transfer to food production.

Applications of PD Flow Meter

The PD flow meter is suitable for a wide range of industries:

• Oil & Gas – Fuel transfer, lubricant measurement, custody transfer.

• Chemical Industry – Precise dosing of acids, solvents, and additives.

• Food & Beverage – Measurement of milk, syrups, edible oils, and beverages.

• Pharmaceuticals – Precise flow control for high-value liquids.

• Water Treatment – Dosing of treatment chemicals.

Conclusion

The Positive Displacement Flow Meter provides a highly accurate, durable, and versatile solution for industrial liquid measurement. With its volumetric principle, it offers stable performance even with high-viscosity fluids, making it indispensable in industries where precision and reliability are essential.

By following proper cleaning procedures, maintenance schedules, and ensuring correct packaging during transport, businesses can maximize the meter’s service life and guarantee accurate measurement results.

For companies seeking cost-effective, long-lasting, and globally trusted flow measurement solutions, the Positive Displacement Flow Meter remains an ideal choice.