Principle

Piezoelectric element

V AC＋

Elastic metal plate (Shim)*0Shrink−Expand

Flow adjustment methods
The flow rate of the piezoelectric pump can be adjusted by the following three methods.

At internal lab test, the flow rate is halved at aviscosity of 30 mPa.s. The viscosity of fluids suchas lubricating oil can change considerably withtemperature.

Self-priming power :The power the pump requires to draw water.
1 kPa = the power to draw up 25℃ water 10 cm.

By narrowing the discharge port,
the discharge pressure rises andthe flow rate linearly decreases.
Even if the discharge port is in aclosed condition, the oscillator
amplitude will only decrease andnot burn out like a motor drivenpump.

Discharge head

The force to pressurize the liquid.
30 kPa = the power to pressurize 25℃ water 3 m.

NITTO KOHKI CO., LTD.
www.nitto-kohki.co.jp/e

200

600
500
400

1020

Pressure［kPa］

3040

Voltage - Flow characteristics

5040

Flow
Discharge pressure

30300

20200

10100

0204060

voltage［V］

800100*The flow characteristics of 120 V and 240 V models are equivalent.

The flow rate varies with thefrequency, but the dischargepressure is constant. It is effective
for changing the flow rate without
being affected by dischargepressure. The maximum flow ratevaries depending on model, but it
occurs at about 100 to 120 Hz.

700

Frequency - Flow characteristics

600

Flow［mL/min］

Suction head

The discharge pressure of the bimorph pumpis the measurement value when the suction
head is zero, so the discharge pressure = thetotal head.

30003. Varying the drive frequency
Piezoelectricpump

400

100

Flow［mL/min］

The flow rate and dischargepressure linearly decrease withthe voltage drop. Please do not
exceed the rated voltage since
the thickness of the piezoelectricelement is designed close to thewithstand voltage.

Pressure - Flow characteristics

500

2. Lowering the drive voltage

Dischage pressure :Total head

600

Utilizing a Piezo-Electric Bimorph to reach
New Standards in Pumping Technology

Discharge pressure［kPa］

Viscosity of liquid

1. Narrowing the discharge portor piping

50

Discharge pressure［kPa］

The durability of the pump is affected by thecompatibility between the wetted material and theliquid. Please check to confirm the suitability
against the specfic application/conditions.

Flow［mL/min］

Durability of Piezoelectric pump

BIMOR PUMP Series

・ Discharge volume can be adjusted by controlling the numberof amplitude of power supply.
(50 Hz = 50 times / sec. 60 Hz = 60 times / sec.)*Elastic metal plate (Shim): Where ceramic is affixed.

Frequently Asked Questions

Liquid Pump

・ The Bimorph deforms like a bowl when applied with AC
voltage, positive and reverse deformation is achieved byalternating frequency from + to −.

ShrinkWebLk063a＜Bimorph vibrator＞ The BIMOR pump’s driving force, the bimorph, comprises two parallel piezoelectric wafers.

405003040030020200Flow
Discharge pressure

100020406080

Frequency［Hz］

100101200

BPS/BPH/BPHS/BPF type
Principle/Structure

Driving power: Piezoelectric Bimorph Bending
SuctionHead Office9-4, Nakaikegami 2-chome, Ohta-ku, Tokyo 146-8555, Japan
Tel : +81-3-3755-1111
Fax : +81-3-3753-8791
E-mail : overseas@nitto-kohki.co.jp

Discharge

ISO9001

JQA-2025

ISO14001
ISO 9001
ISO 14001

JQA-EM4057
H.Q./R&D Lab

・ For water supply and drainage
・ For cooling water circulation
・ For chemical injection
・ For liquid sampling

Outlet Valve

DISTRIBUTED BY

Applications

Inlet Valve
Piezoelectric Bimorph
This catalog is printed using environmentally friendly paper and vegetable oil inks.

Specifications and designs are subject to change at any time without notice.

Printed in Japan

19LX00- 1- Piezoelectric Pump series -Specifications

Revolutionary piezoelectric bimorph technology-Piezoelectric Pump series -240V models are newly redesined.
The flow rate is increased by about 160 %.
Voltage(AC)120 V 60 HzVoltage(AC)240 V 60 Hz

Material of Wetted Parts

ModelCurrent(mA)

Self-priming
Pressure(kPa)

Flow Rate(mL/min)

Discharge
Pressure(kPa)

ModelCurrent(mA)

Self-priming
Pressure(kPa)

Flow Rate(mL/min)

Discharge
Pressure(kPa)

Housing

BPS-215i

3

330

15―

――――

PP

PP

IIR

40

BPH-214E

15835018

BPH-214E

7.5

8350

18

PP

PP

EPDM

140

WeightLiquidValve / O-ring(g)Contact Sheet

BPH-214G

15735017

BPH-214G

7.5

7350

17PP

PTFE

FKM

140

BPH-414E

3012500

35―――――PPPP

EPDM

140―――――

BPH-474G

151040035PPSPTFE

FKM

170

―

――――

BPH-474P

151040035PPSPTFE

FFKM/FEP

170

The BIMOR pump's driving force, the bimorph, comprises twoparallel piezoelectric wafers. Their nature is to expand or contract
depending on the direction of the voltage. Therefore when an
alternating current is applied, one wafer expands then contracts
while the other contracts then expands, causing the bimorph tobend. Repeating the cycle creates the pumping action.

BPS type[Cross section]
Check valves
O-ringBPHS-414i/E/G

BPF typeBimorph
vibrator

Made to order models

These models are made-to-order models.
Please send a request for quotation to your nearest distributor.

BPH typeO-ring

Liquid contact sheet

Elastic mold

BPHS-474G/P

Specifications
Voltage(AC)Model

Current(mA)

Self-priming
Pressure(kPa)

―

―

―

120 V 60 Hz

Voltage(AC)240 V 60Hz

Flow Rate(mL/min)

Discharge
Pressure(kPa)――BPS-215i

1.83

Model

Current Self-priming
Pressure(mA)(kPa)

Material of Wetted Parts

Flow Rate(mL/min)

Discharge
Pressure(kPa)

Housing

30

15PPPP

IIR40

WeightLiquidValve / O-ring(g)Contact Sheet―――――

BPS-235G

1.8

1.5

30

15POM

PTFE

FKM

40

BPH-214i

15835018

BPH-214i

7.5

8350

18

PP

PP

IIR

130―――――

BPH-214D

7.5

8350

18

PP

PP

VMQ

130―――――

BPH-414i

1512500

35

PP

PP

IIR

140

BPH-414D

3012500

35

BPH-414D

1512500

35

PP

PP

VMQ

140―――――

BPH-414E

151250035

PP

PP

EPDM

140

BPH-414G

301045032

BPH-414G

1510450

32

PP

PTFE

FKM

140

BPH-474G

3010400

35―――――PPSPTFE

FKM

170

BPH-474P

301040035―――――PPSPTFE

FFKM/FEP

170―――――

BPHS-414i

1512700

35

PP

PP

IIR

160―――――

BPHS-414E

1512700

35

PP

PP

EPDM

160―――――

BPHS-414G

1512700

35

PP

PTFE

FKM

160―――――

BPHS-474G

1510500

35

PPS

PTFE

FKM

180―――――

BPHS-474P

1510500

35

PPS

PTFE

FFKM/FEP

180

BPF-465P

3010400

35

BPF-465P

1510400

35

PFA

PTFE

FFKM/FEP

350

Material Description
EPDM
FEP
FFKM
FKM
IIR
PFA
POM
PP
PPS
PTFE
VMQEthylene Propylene Rubber
Fluoroethylene Propylene
Perfluoroelastomer
Fluorine Rubber
Butyl Rubber
Fluororesin (Perfluoroalkoxy)
Polyacetal
Polypropylene
Polyphenylene Sulfide
Tetrafluororesin(Polytetrafluoroethylene)

The meaning of each letter inthe model name

BP H

Rubber material (Valve, O-ring)S : Small type
H : Dismantlable type
F : Chemical-resistant type
HS : High flow type

Diaphragm type
2: Single
4: Double

Condition of Use
5 to 50℃ *1

Ambient humidity

35 to 85％ *2

Fluid temperature

5 to 50℃

i : Butyl Rubber (IIR)
D : Dimethyl Silicon Rubber (VMQ)
E : Ethylene Propylene Rubber (EPDM)
G : Fluorine Rubber (FKM)
P : Perfluoroelastomer (FFKM)

Pump type

Dimethyl Silicon Rubber

Ambient temperature

4 1 4 D

Pump type

4: Dismantlable type
5: Chemical-resistant type and small type

Housing material*1) No Freezing*2) No condensation

1: Polypropylene (PP)
2: Polyacetal (POM)
6: Fluororesin (Perfluoroalkoxy) (PFA)
7: Polyphenylene Sulfide (PPS)

How to install

Attention

Please install the pump to a flat side.

BPS type

When installing, make sure the outlet
is at the top and the inlet is at thebottom.

Depending on the direction of installation,
sufficient performance may not be obtained.

OutletUTIN O

BPH,BPHS,BPF typeInstall the pump so that the IN / OUT
display is in the correct orientation.

Inlet
BPS typee.g. :
If installed on the bottom of adevice, the performance may
deteriorate.

BPH, BPHS, BPF type

Suitable/unsuitable chemical liquids
Model

Examples of suitable chemical liquids

Examples of unsuitable chemical liquids

BPS-215i
BPH-214i
BPH-414i
BPHS-414i

Ethanol,Dilute hydrochloric acid,Sodium carbonate,Benzaldehyde,Formalin

BPH-214E
BPH-414E
BPHS-414E

Ammonia water, Ethanol, Dilute hydrochloric acid,
Caustic potash, Caustic soda, Methanol

BPS-235G

Ethanol, Xylene, Silicone oil, Kerosene,Toluene, Benzene

Ammonia water, Hydrochloric acid,
Hydrogen peroxide, Sodium hypochlorite,
Nitric acid, Sulfuric acidBPH-214D
BPH-414D

Ammonia water, Ethanol, Sodium hypochlorite,
Methanol

Caustic soda, Carbon tetrachloride, Silicone oil,
Trichloroethylene, Toluene, Benzene

BPH-214G
BPH-414G
BPHS-414G

Ethanol, Hydrogen peroxide, Mineral oil,
Sodium hypochlorite

Acetone, Ammonia water, Glacial acetic acid,
Hydrofluoric acid, Formalin

BPH-474G
BPHS-474G

Ethanol, Xylene, Carbon tetrachloride,
Silicone oil, Trichloroethylene

Acetone, Ammonia water, Chlorosulfonic acid,
Glacial acetic acid, Hydrofluoric acid, Formalin

BPH-474P
BPHS-474P

Ethanol, Chloroform, Glacial acetic acid,
Benzene, Methyl ethyl ketone

Chlorosulfonic acid, Fluorine oil,
CFC 112, CFC 113

BPF-465P

Ethanol, Aqua regia, Ozone, Carbon tetrachloride,
Concentrated nitric acid, Concentrated sulfuric acid,
Fuming sulfuric acidFluorine oil, CFC 112, CFC 113

Xylene, Mineral oil, Carbon tetrachloride,
Trichloroethylene, Toluene, Benzene