Product Detail

Description

🔧 Working Principle:

• Fluid enters a chamber or cavity.

• A mechanical component (gear, piston, diaphragm, rotor, etc.) displaces the fluid.

• The fluid is pushed through the discharge at a consistent rate.

🔧 Key Components :

🧪 Typical Applications:

• Chemical dosing

• Oil and gas transfer

• Hydraulic systems

• Food and beverage processing

• Pharmaceutical and cosmetic production

• Sludge, slurry, and viscous fluid pumping

✅ Advantages:

• Constant flow regardless of discharge pressure

• Ideal for high-viscosity or shear-sensitive fluids

• Can handle solids and slurries

• Excellent for metering and dosing

• Self-priming and can run dry (certain types)

❌ Disadvantages:

• • Typically lower flow rates compared to centrifugal pumps

  • May pulsate unless dampened

  • Can be damaged by running against closed valves (need relief valves)

  • More moving parts = potentially higher maintenance

     Technical Details

    📐 1. Key Specifications:

    Parameter	Typical Range / Description
    Flow Rate (Q)	0.1 LPM to 100,000+ LPM (depends on type & size)
    Pressure Range	Up to 1000+ bar (especially for piston or plunger types)
    Viscosity Handling	Up to 1,000,000 cP (ideal for thick, viscous fluids)
    Speed (RPM)	10 – 1800 RPM (varies by application)
    Temperature Range	-50°C to 350°C (with special materials)
    Self-Priming Ability	Yes (most PD pumps are self-priming)
    Solids Handling	Capable (especially peristaltic, lobe, or screw pumps)

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    ⚙️ 2. Components Vary by Type:

    • Rotary PD Pumps: Use gears, screws, vanes, or lobes.

    • Reciprocating PD Pumps: Use pistons, plungers, or diaphragms.

    • Include chambers, seals, relief valves, and drive systems.

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    ⭐ Features of Positive Displacement Pumps

    1. Constant Flow Output

       • Delivers steady volume regardless of pressure changes.

    2. Self-Priming

       • Can start pumping without external priming aid.

    3. Handles High Viscosity & Slurry

       • Ideal for thick fluids, pastes, or those containing solids.

    4. High Pressure Capability

       • Suitable for high-head applications like injection systems.

    5. Precision Metering

       • Offers accurate and repeatable flow, useful for dosing chemicals or pharmaceuticals.

    6. Low Shear

       • Gentle pumping action protects shear-sensitive fluids.

    7. Dry Running (some types)

       • Peristaltic and some diaphragm pumps can run dry without damage.

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    ✅ Benefits of Positive Displacement Pumps

    Benefit	Explanation
    💧 Consistent Flow	Ideal for batching, dosing, and precise delivery.
    🛠️ Versatile Handling	Works with a wide range of fluids – thin to extremely thick.
    🚫 No Cavitation Risk	Performs well at low suction pressures.
    ⚖️ Energy Efficient	Especially efficient at low flow, high pressure conditions.
    💡 Flexible Design	Can be customized with various drives, materials, and seals.
    🔁 Reversible Operation	Many types can run in both directions.