A Positive Displacement Flowmeter (PD Flowmeter) is one of the most precise instruments used to measure the volumetric flow rate of liquids. Unlike other flowmeters that rely on velocity or pressure changes, this type of device physically separates the liquid into fixed, measurable volumes and counts the number of times these volumes pass through the meter. Each rotation or displacement represents a specific quantity of liquid, allowing for exceptionally accurate and repeatable readings.
In industries where accuracy is crucial—such as chemical processing, oil and gas, pharmaceuticals, and food production—the Positive Displacement Flowmeter plays a vital role in maintaining quality control and process efficiency.
When it comes to precision, reliability, and long-term stability, Positive Displacement Flowmeters stand out for several key reasons:
Exceptional Accuracy – Typically within ±0.1% to ±0.5% of the true value, ensuring minimal measurement errors.
Independent of Flow Profile – Works effectively even with pulsating, viscous, or irregular flow conditions.
No Need for Straight Pipe Runs – Unlike turbine or ultrasonic flowmeters, PD flowmeters don't require long upstream or downstream sections.
Durability – Built with robust materials suitable for demanding industrial environments.
Wide Range of Applications – Suitable for measuring fuels, oils, hydraulic fluids, syrups, solvents, and more.
These benefits make the Positive Displacement Flowmeter a cost-effective and dependable choice for precise volume measurement.
At Wenzhou Supertech Machine Co., Ltd., we specialize in manufacturing high-precision Positive Displacement Flowmeters designed to meet the requirements of multiple industries. Below is a summary of our standard specifications:
| Parameter | Specification |
|---|---|
| Measuring Principle | Rotary Piston / Oval Gear / Helical Rotor |
| Flow Range | 0.1 – 1,000 L/min (customizable) |
| Accuracy | ±0.2% of reading (standard) |
| Repeatability | ±0.05% |
| Operating Pressure | Up to 25 MPa |
| Operating Temperature | -40°C to +120°C |
| Viscosity Range | 0.3 – 2,000 mPa·s |
| Body Material | Stainless Steel / Aluminum Alloy / Cast Iron |
| Output Signal | Pulse / 4-20mA / RS485 |
| Power Supply | 12–24 VDC |
| Connection Type | Threaded / Flanged / Tri-Clamp |
Every Positive Displacement Flowmeter is carefully tested for accuracy, repeatability, and durability before shipment to ensure consistent performance in the field.
The Positive Displacement Flowmeter is ideal for both clean and viscous liquid measurement. Its performance remains stable even when dealing with liquids that would cause problems for other types of flowmeters.
In the Oil & Gas Industry: Used for precise fuel dispensing, pipeline monitoring, and lubrication control.
In Food and Beverage: Measures syrups, dairy products, and other viscous ingredients with hygiene-grade stainless steel options.
In Chemical Processing: Ensures accurate dosing and blending of chemicals, even in high-viscosity applications.
In Pharmaceuticals: Supports precision filling and quality control processes where every milliliter matters.
Because the Positive Displacement Flowmeter measures actual volume, not flow velocity, it maintains consistent accuracy regardless of changes in viscosity or flow profile.
| Feature | Positive Displacement Flowmeter | Turbine Flowmeter | Electromagnetic Flowmeter |
|---|---|---|---|
| Accuracy | ±0.1%–±0.5% | ±0.5%–±1.0% | ±0.3%–±1.0% |
| Viscosity Handling | Excellent | Poor | Good |
| Flow Profile Sensitivity | None | High | Low |
| Maintenance Requirement | Low | Medium | Low |
| Suitable for Non-conductive Liquids | Yes | Yes | No |
| Typical Applications | Oil, Fuel, Chemicals, Syrups | Clean Liquids | Water, Slurries |
This comparison shows why many industries prefer Positive Displacement Flowmeters when measurement accuracy and versatility are top priorities.
Q1: What type of liquids can a Positive Displacement Flowmeter measure?
A1: It can accurately measure both low-viscosity liquids like gasoline and solvents, and high-viscosity fluids like oils, syrups, and resins. This flexibility makes it ideal for diverse industries.
Q2: How does a Positive Displacement Flowmeter maintain accuracy with changing viscosity?
A2: Since it measures the actual volume displaced, rather than flow velocity, its accuracy remains consistent even when fluid viscosity changes due to temperature or composition variations.
Q3: What maintenance does a Positive Displacement Flowmeter require?
A3: Minimal maintenance is needed. Regular cleaning of moving parts and periodic calibration (depending on the liquid type) ensure long-term accuracy and reliable operation.
Q4: Can a Positive Displacement Flowmeter handle corrosive or chemical fluids?
A4: Yes. Wenzhou Supertech Machine Co., Ltd. offers models made of stainless steel or special alloys, suitable for handling aggressive chemicals and corrosive fluids safely.
Selecting the correct model depends on factors like flow rate, pressure, temperature, and fluid type. Our engineering team at Wenzhou Supertech Machine Co., Ltd. provides personalized guidance and customization to match your exact needs. Whether you need a compact design for confined spaces or a high-flow industrial unit, we can supply the perfect solution.
A Positive Displacement Flowmeter is an investment in precision, reliability, and long-term value. Its superior performance in accuracy, versatility, and durability makes it the preferred choice for industries that demand consistent measurement results.
At Wenzhou Supertech Machine Co., Ltd., we combine advanced technology with over two decades of engineering experience to manufacture flow measurement instruments that meet global standards.
📞 Contact us today to learn more about our Positive Displacement Flowmeter solutions or to request a personalized quotation tailored to your specific requirements.
Wenzhou Supertech Machine Co., Ltd. – Your Trusted Partner in Precision Flow Measurement.
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