Dosing Capacitor Electrolyte with a Stainless Steel Valveless Piston Pump

A customer came to us with a tricky dosing application: capacitor electrolyte.

Capacitor electrolyte is chemically aggressive. Many pumps fail quickly because the fluid corrodes metal parts or damages seals.

The customer needed:

6 grams of electrolyte per shot

6 seconds injection time

25 seconds pause between shots

Fluid temperature: 40°C (normal)

Atmospheric pressure

They tried other pump technologies. The result? Inconsistent dosing, leaking, or short pump life.

Why a Valveless Piston Pump?

We recommended our CX-CP-SS-200-57-BJ-A-8 — a stainless steel valveless ceramic piston pump.

Why valveless?

Traditional pumps use check valves. Valves can stick, leak, or clog — especially with electrolyte fluids. A valveless design 

eliminates those failure points entirely.

The Solution: CX-CP-SS-200-57-BJ-A-8

Here is exactly what the customer received:

Parameter Specification

Model CX-CP-SS-200-57-BJ-A-8

Plunger diameter 8 mm

Displacement 200 μL per revolution

Flow range 0 – 100 mL/min

Speed range 0 – 500 r/min

Wetted material SS304 stainless steel

Connections 6mm ferrule fitting (custom)

Pressure rating ≤0.3 MPa

Repeat accuracy ≤0.5%

Max fluid temp ≤100°C

Drive 2-phase stepper motor

Voltage DC24V

Power 50W

Installation Vertical (top/bottom ports)

Adjustability Flow per revolution adjustable

How It Works in Production

The pump runs a simple cycle:

Wait 25 seconds (idle)

Run 6 seconds → deliver exactly 6g of electrolyte

Repeat

With a displacement of 200 μL per revolution, the pump reaches the required flow rate easily. The stepper motor gives precise

 control over every shot.

The Result

✅ Consistent 6g shots — every time, cycle after cycle

✅ No leakage — SS304 body handles electrolyte chemistry

✅ 0.5% repeat accuracy — reliable production quality

✅ Simple installation — vertical mounting with 6mm ferrule connections

✅ Low maintenance — no check valves to clean or replace

Why the Customer Chose This Pump

"We needed something simple, reliable, and made of stainless steel. The valveless design meant fewer things to break. The 8mm 

plunger gave us exactly the small shot size we needed. And the 6mm ferrule fitting matched our existing tubing perfectly."

— Customer's Engineering Team

Key Takeaways for Similar Applications

If you are dosing:

Capacitor electrolyte

Chemically active fluids

Small volumes (0.2 mL per rev and up)

Intermittent cycles (pause between shots)

…then a stainless steel valveless ceramic piston pump is worth a serious look.

Final Word

This is not a theoretical design. This is a proven solution running in a real production line today.

The CX-CP-SS-200-57-BJ-A-8 delivered exactly what the customer needed: precision, reliability, and chemical compatibility.

Need a similar pump for your electrolyte dosing application?

Contact us with your media, shot size, and cycle time. We will help you find the right valveless piston pump.