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    Positive Displacement Pumps

    Positive displacement pumps are speciality pumps that provide an approximate constant flow of fluid at the fixed speed. Pump trap a fixed amount of the fluid and then force it into a discharge pipe. Positive displacement pumps can produce the same flow at a given speed (RPM) no matter what the discharge pressure is. These type of pumps cannot operate against the closed valve because they have no shutoff head like centrifugal pumps. Positive displacement pumps constantly produce flow and the pressure built within the blocked line will damage the line, pump or both.

    The positive displacement pumps can be divided into two main categories: reciprocating positive displacement pumps and rotary pumps.

    Rotary pumps are very efficient because they can operate even with highly viscous fluids but require a slow steady speed rotation. If the mechanism rotation is too fast, the fluid can cause erosion, which eventually causes enlarged clearances that liquid can pass through and reduce pressure.

    Rotary pumps can be divided into three main types:

    • Gear pumps: the simplest pump type that pumps liquid using 2 gears.
    • Screw pumps: more complicated pump type where the two screws are positioned against each other to pump the liquid.
    • Rotary vane pumps: these pumps have a cylindrical rotary engine. As the rotor circulates, vans trap fluid between the rotor and the engine housing, pushing the liquid through the pump.

    120 Products showing for Positive Displacement Pumps

    ProMinent
    Diaphragm
    Electric
    63L/h
    7m
    7 bar
    -
    -
    IP65
    S1cb
    -
    PVDF
    100-230 V ±10 % / 240 V ±6 %
    220W
    -
    PVDF
    Hanna Instruments
    Diaphragm
    Electric
    5L/h
    -
    101.5 psi
    -
    -
    IP65
    BL5/D
    -
    Glass Fibre Reinforced PP
    220 V, 240 V
    200W
    -
    -
    SMC
    Diaphragm
    Air
    15L/min
    500mm
    5 bar
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Verderflex
    Peristaltic
    Electric
    375ml/min
    86mm
    1 bar
    -
    -
    -
    M60
    -
    Nylon, Polycarbonate
    24 V dc
    -
    -
    -
    Verderflex
    Peristaltic
    Electric
    375ml/min
    86mm
    1 bar
    -
    -
    -
    M60
    -
    Nylon, Polycarbonate
    24 V dc
    -
    -
    -
    Verderflex
    Peristaltic
    Electric
    375ml/min
    86mm
    1 bar
    -
    -
    -
    M60
    -
    Nylon, Polycarbonate
    24 V dc
    -
    -
    -
    Verderflex
    -
    -
    99ml/min
    -
    -
    -
    -
    -
    OEM
    -
    -
    -
    -
    -
    -
    Verderflex
    -
    -
    99ml/min
    -
    -
    -
    -
    -
    OEM
    -
    -
    -
    -
    -
    -
    Verderflex
    -
    -
    99ml/min
    -
    -
    -
    -
    -
    OEM
    -
    -
    -
    -
    -
    -
    Verderflex
    -
    -
    99ml/min
    -
    -
    -
    -
    -
    OEM
    -
    -
    -
    -
    -
    -
    Verderflex
    -
    -
    99ml/min
    -
    -
    -
    -
    -
    OEM
    -
    -
    -
    -
    -
    -
    Verderflex
    -
    -
    99ml/min
    -
    -
    -
    -
    -
    OEM
    -
    -
    -
    -
    -
    -
    Verderflex
    -
    -
    -
    -
    -
    -
    -
    -
    OEM
    -
    -
    -
    -
    -
    -
    ProMinent
    Peristaltic
    Electric
    6L/h
    -
    2.5 bar
    -
    -
    IP65
    DF4a
    +20°C
    -
    100 → 240 V
    24 (Consumption)W
    -
    -
    SMC
    Diaphragm
    Automatically Operated
    300L/min
    2m
    7 bar
    -
    -
    -
    -
    -
    -
    -
    -
    -
    -
    Verderflex
    Peristaltic
    Electric
    0.12L/min
    10m
    1 bar
    -
    -
    -
    R2550
    +40°C
    ABS, PC
    12 V dc
    6VA
    -
    -
    ProMinent
    Diaphragm
    Electric
    2.3L/h
    6m
    16 bar
    3/4 in G
    3/4 in G
    IP65
    GMXa
    +20°C
    PVDF
    100 → 230 V
    24 / 30 (Consumption)W
    -
    PVDF
    ProMinent
    Diaphragm
    Electric
    42L/h
    10m
    10 bar
    -
    -
    IP65
    S1cb
    -
    PVDF
    100-230 V ±10 % / 240 V ±6 %
    220W
    -
    PVDF
    Verderflex
    -
    -
    -
    -
    -
    -
    -
    -
    OEM
    -
    -
    -
    -
    -
    -
    ProMinent
    Diaphragm
    Electric
    12L/h
    16m
    16 bar
    -
    -
    -
    GXLa
    -
    PVDF
    230 V
    78W
    -
    PVDF
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