BCST Motor Drive Pump Supplier in Bangladesh
BCST motor drive pumps, also called motor-driven metering pumps, for steady and accurate chemical dosing in ETP, WTP and STP, supplied with installation and after-sales support by Techno Bangla Creation.
What Is a Motor Drive Pump?
A motor drive pump, also called a motor-driven metering pump, is a dosing pump that uses an electric motor to move a diaphragm back and forth. Each stroke pushes a set volume of chemical into your process. You set the dose by changing the stroke length or motor speed, so chemicals go in at a steady, measured rate.
It meters chemical, it does not simply move liquid. To empty drums, see our drum and container pump. For very small doses, see the solenoid models on our chemical dosing pump page.
- Electric motor drive for steady, continuous dosing
- Flow set by stroke length and motor speed
- Suits acids, caustic, hypochlorite and coagulants with the right materials
- Installation and after-sales support in Bangladesh
Motor Drive Pump Specifications
- Type
- Motor-driven diaphragm metering (dosing) pump
- Brand
- BCST
- Origin
- China
- Application
- Chemical dosing in ETP, WTP and STP
- Flow, pressure, motor power, voltage
- Depends on the model. Send your duty point and we confirm the datasheet
- Head, diaphragm, valve and seal materials
- Depends on the model and the chemical. Confirm on the datasheet
- Dosing accuracy (rule of thumb)
- About ±1 to ±2% for well-installed motor-driven diaphragm pumps
- Suction lift (rule of thumb)
- Keep to about 1.2 m (4 ft) or less. Flooded suction is preferred
The last two rows are general engineering guides for metering pumps, not BCST ratings. Exact flow, pressure, accuracy and materials depend on the model you select, so we confirm them from your chemical, flow and back pressure.
How a Motor-Driven Dosing Pump Works
- Motor TurnsAn electric motor runs, and a worm gear steps its speed down.
- Cam Makes a StrokeA cam turns the rotation into a straight back-and-forth stroke that moves a push rod.
- Diaphragm Draws InOn the suction stroke the diaphragm pulls back and chemical enters through the suction check valve.
- Diaphragm Pushes OutOn the discharge stroke the diaphragm pushes a fixed volume out through the discharge check valve.
- You Set the DoseStroke length sets the volume per stroke and motor speed sets strokes per minute. A calibration column checks the real flow.
Key Benefits
Accurate dosing saves chemical and keeps treatment steady.
- Handles larger flows than solenoid pumps, so one pump can feed a whole ETP or WTP stream
- Steady, accurate dosing at about ±1 to ±2% when installed with proper back pressure
- Diaphragm keeps the chemical away from the motor and gearbox
- Head, diaphragm and valve materials can be matched to acids, caustic, hypochlorite and coagulants
- Flow set by stroke length and motor speed, and on some models by a 4 to 20 mA signal
- Local engineering and after-sales support from Techno Bangla
Is a Motor Drive Pump Right for You?
Choose a Motor Drive Pump When
- You dose chemical steadily, hour after hour
- Your flow is above what a small solenoid pump can give
- You want to set flow by stroke length and motor speed
- The pump will run for long periods without supervision
- You can fit a back pressure valve and a calibration column
Choose Another Pump When
- You need very small doses or pH trim. See the solenoid models on our chemical dosing pump page
- You only need to empty a drum. See our drum pump
- The liquid is sludge or slurry. See the air operated diaphragm pump
- You need very high pressure, where a hydraulic diaphragm or plunger pump fits better
- Your chemical is too hot or too aggressive for the available head materials
Where Motor-Driven Dosing Pumps Are Used
Any plant that adds chemical to water or effluent in measured amounts.
- ETP pH Correction
- Coagulant Dosing
- Sodium Hypochlorite Disinfection
- WTP Chemical Feed
- STP Chemical Dosing
- Antiscalant Dosing
- Cooling Tower Water Treatment
- Textile and Dyeing Plants
How to Choose the Right Motor Drive Pump
Share these details with our engineers and we will recommend a suitable model and accessories.
- Flow and back pressure. Give the dose in L/h and the pressure at the injection point. A metering pump delivers a different flow at a different pressure, so we size and calibrate it at your real pressure.
- Chemical and wetted parts. Give the chemical name, strength and temperature. PVC and PP suit many water-treatment chemicals, PVDF suits strong acids, and 316L stainless steel suits solvents but not hydrochloric acid. Check the diaphragm, valve balls and seals too.
- Suction side. Keep suction lift to about 1.2 m (4 ft) or less and use flooded suction where you can. Add a suction strainer of about 40 to 60 mesh to protect the check valves.
- Discharge side. Fit a back pressure valve, which steadies the flow and stops siphoning from a tank. Add a relief valve, a pulsation dampener and a calibration column.
- Control and power. Tell us your power supply, single or three phase. Ask about a variable speed drive or 4 to 20 mA control, and an explosion-proof motor where needed.
Frequently Asked Questions
What is a motor drive (motor-driven) dosing pump?
It is a metering pump in which an electric motor, a worm gear and a cam move a diaphragm. Each stroke delivers a set volume of chemical. Stroke length and motor speed set the dose. It suits steady, continuous dosing of medium to larger volumes in ETP, WTP and STP.
How does a motor-driven dosing pump work?
The motor turns a cam that moves a push rod and the diaphragm. On the suction stroke chemical enters through one check valve. On the discharge stroke the same volume leaves through a second check valve. You change the dose with the stroke length and the motor speed.
Motor-driven or solenoid dosing pump: which should I choose?
Choose motor-driven for continuous dosing of larger volumes, often tens to hundreds of L/h. Choose solenoid for small doses, typically up to about 22 to 75 L/h, and for pH trim. Both are accurate to about ±2% when installed well. Tell us your flow and back pressure.
How accurate is a motor-driven dosing pump?
Well-installed motor-driven diaphragm pumps typically reach about ±1 to ±2% accuracy. To get there, fit a back pressure valve, use a suction strainer and calibrate the pump at your real pressure with a calibration column. Accuracy drifts when check valves wear or the injector fouls.
Which head and diaphragm material should I choose?
PVC and PP suit many water-treatment chemicals, PVDF suits strong acids, and 316L stainless steel suits solvents but not hydrochloric acid. PTFE is a common diaphragm material because it resists most chemicals. Always check the chemical resistance chart for your chemical, strength and temperature.
How far can a dosing pump lift chemical from the tank?
Keep suction lift to about 1.2 m (4 ft) or less, and use flooded suction where possible because it primes more easily. Add a strainer of 40 to 60 mesh. If your tank sits far below the pump, tell us and we will advise on the layout.
What accessories does a dosing pump need?
A suction strainer, a back pressure valve, a relief valve, a pulsation dampener and a calibration column. The back pressure valve steadies flow and stops siphoning. The relief valve protects against blocked lines. The calibration column lets you check the real dose at any time.
How can I get a quotation for a motor drive pump?
Send your chemical name and strength, dose in L/h, back pressure and power supply to our engineers by phone or email. We reply with a free quotation for your ETP, STP, WTP or water treatment equipment, with installation and after-sales support in Bangladesh.
