Bellows Pump

Bellows type metering pump

Nikkiso Eiko Bellows type metering pumps include the GS series, which use a small capacity synchronous motor; the GX series, which uses a shaded-pole motor; the GY series, which uses an induction motor; and the GD series, which uses a DC motor. We have a diverse line-up of models that can support the needs of our customer, including various applications, built-in equipment, etc. Creating a multi-purpose model by combining different sized Bellows type pumps is also possible.


Discharge accuracy

Accuracy is ±1.5% at the maximum stroke length for freshwater. High accuracy is attained when operating with a maximum stroke length of 50% or more.

Leak proof

There are no leaks because there is no shaft seal portion.

Self –priming Capable

For clean water at a normal temperature priming is not necessary until 0.7m degrees, because it is self-priming.

Dry operation available

Dry operation is possible since there are no friction components.

Long service life

Superior flexing capabilities of polypropylene, which has excellent corrosion resistance, provides millions of cycles under normal operating conditions.

Corrosion resistance

The body of the pump uses polypropylene, and the poppet valve and O-ring use EPDM, FPM, and CSM, to allow handling of acids, alkali, and various other corrosive liquids.

Liquid Temperature

Maximum is 60℃. When exceeding 50℃, maximum discharge pressure will be half or less than the value displayed on the table below. Be careful if you exceed 40℃, because the liquid’s corrosivity will increase. Usage is not recommended at low temperatures (0℃ or below).



Vending machines


Preparation of high viscosity syrups, metered addition of food additives


Printing and wiring board etching and cleaning


Water and drainage acid processing, alkali neutralization, and flocculent infusion


Metered infusion of various chemical liquids


Wide range of applications for additives and various types of liquid chemical bleaching agents



GS model – Synchronous motor: Instant stop, large flow

 ベローズポンプ GS型1連 Maximum flow rate

(50Hz/60Hz per single head)

Maximum discharge pressure

GX model – Shaded-pole motor: High discharge head, large flow

 ベローズポンプ GX型 Maximum flow rate

(50Hz/60Hz per single head)

Maximum discharge pressure

GY model – Induction motor: High discharge head, large flow

 ベローズポンプ GY型 Maximum flow rate

(50Hz/60Hz per single head)

Maximum discharge pressure

Internal Structure

  • Please feel free to contact us for inquiries and requests
  • Please feel free to contact us for inquiries and requests