Positive Displacement Pumps | Rotary | RS
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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.

    125 Products showing for Positive Displacement Pumps

    RS PRO
    Diaphragm
    Electric
    0.4L/min
    -
    -500/800 mBar
    3.6mm Hose Barb
    2.4mm ID Semi-flexible Tubing
    IP41
    D250
    +100°C
    Aluminium
    2 → 4.5V
    0.4 → 0.6W
    -
    316 Stainless steel, FKM
    Hanna Instruments
    Diaphragm
    Electric
    15.2L/h
    -
    14.5 psi
    -
    -
    IP65
    BL15/D
    -
    Glass Fibre Reinforced PP
    220 V, 240 V
    200W
    -
    -
    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
    Air
    650L/h
    -
    7 bar
    -
    -
    -
    -
    -
    PVDF
    -
    -
    -
    -
    ProMinent
    Diaphragm
    Electric
    7.1L/h
    6m
    7 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
    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
    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
    Electric
    5.5L/min
    105m
    10.3 bar
    3/8 in NPT
    3/8 in NPT
    -
    R381
    +60°C
    Glass Fibre Reinforced Nylon
    24 V
    108W
    -
    -
    Xylem Flojet
    Diaphragm
    Electric
    3.8L/min
    25m
    2.4 bar
    3/8 in Hose Barb
    3/8 in Hose Barb
    -
    RLF222
    +43°C
    PP
    24 V dc
    30W
    -
    -
    Xylem Flojet
    Diaphragm
    Electric
    3.8L/min
    21m
    2.5 bar
    3/8 in Hose Barb
    3/8 in Hose Barb
    -
    RLF122
    +43°C
    PP
    12 V dc
    30W
    -
    EPDM, PP, Santoprene, Stainless Steel, Viton
    ProMinent
    Diaphragm
    Electric
    3.6L/h
    6m
    16 bar
    3/4 in G
    3/4 in G
    IP65
    BT4B
    +20°C
    PVDF
    100 → 230 V
    15.2 (Consumption)W
    -
    PVDF
    Xylem
    Diaphragm
    Electric
    13L/min
    -
    3 bar
    1/2 in Hose Barb
    1/2 in Hose Barb
    IP55
    CW474
    -
    Glass Fibre Reinforced PP
    230 V ac
    120W
    -
    -
    ProMinent
    Diaphragm
    Electric
    12.3L/h
    3m
    4 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
    Electric
    10.8L/min
    28m
    20 bar
    1/2 in NPT
    1/2 in NPT
    IP44
    AD550
    +60°C
    -
    230 V
    33W
    -
    -
    Xylem Flojet
    Diaphragm
    Electric
    7.6L/min
    41m
    4.1 bar
    3/4 in NPT
    3/8 in NPT
    -
    R352
    +60°C
    PP
    24 V
    144W
    -
    -
    Verderflex
    Peristaltic
    Electric
    375ml/min
    86mm
    1 bar
    -
    -
    -
    M60
    -
    Nylon, Polycarbonate
    24 V dc
    -
    -
    -
    ProMinent
    -
    -
    80L/h
    -
    -
    -
    -
    IP67
    DCCA
    -
    -
    90 → 253 V ac
    -
    -
    -
    Xylem Jabsco
    Centrifugal
    Electric
    80L/min
    20m
    -
    1-1/2 in BSP
    1-1/2 in BSP
    IP55
    -
    -
    Bronze
    230 V ac
    550W
    -
    -
    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
    -
    -
    ProMinent
    Diaphragm
    Air
    6.3L/h
    4m
    7 bar
    -
    -
    -
    PNDB
    -
    PVDF
    100 → 230 V
    -
    -
    -
    Resultater per side