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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 產品顯示為 Positive Displacement Pumps

    RS PRO
    Diaphragm
    Electric
    0.4L/min
    -
    11 psi
    3.6mm Hose Barb
    2.4mm ID Semi-flexible Tubing
    IP41
    D250
    +100°C
    Aluminium
    1.5 → 5 V
    0.4 → 0.6W
    -
    Anodized Aluminium, Nitrile, Silicone, Stainless Steel
    Verderflex
    Peristaltic
    Electric
    0.225L/min
    20m
    1 bar
    -
    -
    -
    EZ3R1
    +40°C
    Polyamide
    12 V dc
    17W
    -
    -
    SMC
    -
    Air
    2700L/h
    -
    1.05 Mpa
    -
    -
    -
    PA3000
    +60°C
    ADC12
    -
    -
    -
    Aluminium Body, NBR Diaphragms
    Xylem Flojet
    Diaphragm
    Air
    19L/min
    -
    6.9 bar
    1/2 in Hose Barb, 1/4 in Hose Barb
    1/2 in Hose Barb, 1/4 in Hose Barb
    -
    G5732
    +48.9°C
    PP
    -
    -
    -
    Hastelloy C, Kalrez, PP, Santoprene, Viton
    Xylem Flojet
    Diaphragm
    Electric
    19L/min
    -
    3.1 bar
    3/4 in Hose Barb
    3/4 in Hose Barb
    IP44
    R4300
    -
    PP
    12 V dc
    -
    -
    Buna, Elastomer, PP
    Verderflex
    Peristaltic
    Electric
    375ml/min
    86mm
    1 bar
    -
    -
    -
    M60
    -
    Nylon, Polycarbonate
    24 V dc
    -
    -
    -
    Xylem Flojet
    Diaphragm
    Electric
    8.1L/min
    30m
    7.1 bar
    3/8 in NPT
    3/8 in NPT
    IP44
    D3135
    -
    Glass Fibre Reinforced PP
    12 V
    -
    -
    -
    Hanna Instruments
    Diaphragm
    Electric
    15.2L/h
    -
    14.5 psi
    -
    -
    IP65
    BL15/D
    -
    Glass Fibre Reinforced PP
    220 V, 240 V
    200W
    -
    -
    Xylem Jabsco
    Centrifugal
    Electric
    18L/min
    15m
    1.7 bar
    3/4 in BSP
    3/4 in BSP
    IP54
    -
    -
    Bronze
    230 V
    180W
    -
    -
    ProMinent
    Diaphragm
    Electric
    19L/h
    2m
    2 bar
    3/4 in G
    3/4 in G
    IP65
    BT4B
    +20°C
    PVDF
    100 → 230 V
    15.2 (Consumption)W
    -
    PVDF
    Xylem Flojet
    Diaphragm
    Air
    18.9L/min
    -
    100 psi
    6 mm Hose
    9.5 mm → 15 mm Hose
    -
    G70K
    +49°C
    PP
    -
    -
    ATEX
    -
    Burkert
    Diaphragm
    Electric
    5ml/min
    -
    200 mbar
    -
    -
    IP40
    7604
    +60°C
    PEEK
    24 V dc
    1.5W
    -
    FFKM, PEEK
    ProMinent
    Diaphragm
    Air
    650L/h
    -
    7 bar
    -
    -
    -
    -
    -
    PVDF
    -
    -
    -
    -
    ProMinent
    Diaphragm
    Electric
    20L/h
    10m
    10 bar
    -
    -
    -
    GXLa
    -
    PVDF
    230 V
    78W
    -
    PVDF
    Xylem Flojet
    Diaphragm
    Electric
    3L/min
    89m
    20 bar
    -
    -
    IP44
    AD4/90
    +77°C
    -
    230 V
    55W
    -
    -
    Xylem Flojet
    Diaphragm
    Air
    19L/min
    -
    8.27 bar
    1/2 in Hose Barb, 1/4 in Hose Barb
    1/2 in Hose Barb, 1/4 in Hose Barb
    -
    G5752
    -
    PP
    -
    -
    -
    Hastelloy C, Kalrez, PP, Santoprene, Viton
    Xylem Flojet
    Diaphragm
    Electric
    5.5L/min
    105m
    10.5 bar
    3/8 in NPT
    3/8 in NPT
    -
    R381
    +60°C
    Glass Fibre Reinforced Nylon
    12 V
    108W
    -
    -
    Verderflex
    Peristaltic
    Electric
    0.03L/min
    10m
    1 bar
    -
    -
    -
    R2550
    +40°C
    ABS, PC
    12 V dc
    6VA
    -
    -
    Verderflex
    Peristaltic
    Electric
    0.24L/min
    10m
    1 bar
    -
    -
    -
    R2550
    +40°C
    ABS, PC
    12 V dc
    6VA
    -
    -
    ProMinent
    Diaphragm
    Electric
    1.1L/h
    6m
    16 bar
    3/4 in G
    3/4 in G
    IP65
    BT4B
    +20°C
    PVDF
    100 → 230 V
    9.6 (Consumption)W
    -
    PVDF
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