QBY Pneumatic Diaphragm Chemical Pump

Product Description

Model Code Explanation

Product Introduction

QBY pneumatic diaphragm pump is a new type of transfer equipment and one of the most advanced pump types currently available domestically. It uses compressed air as the power source and is capable of completely pumping out a wide range of liquids, including corrosive fluids, liquids containing solids, high-viscosity media, volatile, flammable, and highly toxic liquids.

The pump body can be supplied in several construction materials, including PTFE-lined, plastic, aluminum alloy, cast iron, and stainless steel versions. The diaphragms can be selected according to the handled medium and are available in nitrile rubber (NBR), neoprene rubber (CR), fluororubber (FKM), polytetrafluoroethylene (PTFE), and other fluoroplastics such as FEP, meeting the needs of different users. Installed in various special working conditions for transferring media that conventional pumps cannot handle, QBY pneumatic diaphragm pumps have consistently delivered excellent results.

Product Features

1. The pump will not overheat: compressed air is used as the power source. During exhaust, the air expands and absorbs heat, so the pump temperature decreases during operation and no harmful gases are emitted.
2. No risk of electric sparks: the pump does not use electricity as power and, when properly grounded, static sparks are effectively prevented.
3. Capable of transferring liquids containing particles: as a positive displacement pump with check-ball valves on the suction side, it is not easily clogged.
4. Very low shear on the medium: the pump discharges exactly what it draws in, with minimal agitation, making it suitable for transferring shear-sensitive or unstable materials.
5. Adjustable flow rate: a throttle valve can be installed at the discharge outlet to control and regulate the flow.
6. Self-priming capability.
7. Can run dry without damage or danger.
8. Can operate while submerged.
9. Extremely wide range of compatible fluids, from low-viscosity to high-viscosity, from corrosive liquids to viscous slurries.
10. No complex control system is required and there are no cables, fuses, or similar electrical components.
11. Compact and lightweight design for easy movement and relocation.
12. No lubrication is needed, so maintenance is simple and there is no leakage that could pollute the working environment.
13. The pump maintains high efficiency over time and does not suffer noticeable performance loss due to wear under normal operating conditions.
14. Efficient energy utilization: when the discharge outlet is closed, the pump automatically stops; there is no equipment damage due to overload, wear, or overheating.
15. No dynamic mechanical seal: maintenance is simple, leakage is avoided, and the pump has no dead points during operation.

Product Applications

1. Suction and transfer of peanut butter, pickles, mashed potatoes, sausages, jams, apple paste, chocolate, and similar food products.
2. Pumping paints, resins, and pigments.
3. Transfer of adhesives and glues of all types.
4. Handling glazes and slips for tiles, ceramics, bricks, and other pottery products.
5. Removing sediments and for grouting after oil wells are drilled.
6. Pumping various emulsions and fillers.
7. Pumping different kinds of wastewater.
8. Cargo hold cleaning and bilge pumping on tankers and barges.
9. Pumping slurry of hops and yeast, as well as syrup and molasses.
10. Dewatering in mines, tunnels, shafts, and ore dressing plants; pumping accumulated water, cement grout, and mortar.
11. Pumping various rubber slurries.
12. Handling various abrasives, corrosive agents, petroleum products, mud, and cleaning oils and residues from general containers.
13. Transfer of highly toxic, flammable, and volatile liquids.
14. Pumping strong acids, strong alkalis, and highly corrosive liquids.
15. Transferring high-temperature liquids with temperatures up to 150 °C.
16. Serving as a feed or pressure-transfer unit for various solid–liquid separation devices.

Operating Conditions and Advantages

Because QBY pneumatic diaphragm pumps possess the above characteristics, since the introduction of diaphragm pump technology they have gradually penetrated into the traditional pump market and now occupy a significant share. For example, in spray painting and ceramics industries, diaphragm pumps are already widely used. In other fields such as environmental protection, wastewater treatment, construction, sewage discharge, and fine chemicals, their market share continues to expand, and in many applications they have become irreplaceable by other pump types.

Key application advantages include:

1. Using compressed air as the power source means the flow rate automatically adjusts with changes in back pressure (discharge resistance), making the pump particularly suitable for medium- and high-viscosity fluids. By contrast, centrifugal pumps are designed based on water as the reference medium; for higher-viscosity liquids they need to be combined with gear reducers or frequency converters, greatly increasing cost. Gear pumps face similar limitations.
2. In flammable and explosive environments, air-driven pumps are both safe and cost-effective for transferring fuels, propellants, and explosives because:
   • When properly grounded, no sparks can be generated.
   • No heat is generated by the drive during operation, so the pump does not overheat.
   • The fluid does not overheat because the diaphragm pump exerts very low shear on the medium.
3. On harsh job sites such as construction sites or in mines for wastewater discharge, the wastewater usually contains many impurities and complex components, making pipelines prone to blockage. This places excessive load on electric pumps and can cause motor overheating and damage. Pneumatic diaphragm pumps can pass particles, have adjustable flow, and will automatically stop if the pipeline becomes blocked, resuming operation once the blockage is cleared.
4. The pump is compact and easy to move, requires no foundation, occupies very little space, and is simple and economical to install. It is ideal as a mobile transfer pump for various materials.
5. For hazardous or highly corrosive materials, the diaphragm pump can completely isolate the medium from the surrounding environment, ensuring safe handling.
6. In laboratory or pilot-scale applications, the pump helps ensure that no external contaminants enter the process stream, preventing foreign matter from polluting the raw materials.
7. It is suitable for conveying chemically unstable fluids such as photosensitive materials and flocculants, because the low shear of the diaphragm pump has minimal impact on the physical properties of the handled media.

 

Structure Diagram

No.	Name	No.	Name
1	Air Inlet	7	Connecting Rod
2	Air Valve Body	8	Rod Copper Sleeve
3	Air Valve	9	Center Bracket
4	Ball	10	Pump Inlet
5	Ball Seat	11	Air Outlet
6	Diaphragm

Performance Parameters

Model	Flow (m³/h)	Head (m)	Outlet Pressure (kgf/cm²)	Suction Lift (m)	Max Particle Diameter (mm)	Air Supply Pressure (kgf/cm²)	Air Consumption (m³/min)	Material
								Aluminum Alloy	Stainless Steel	Cast Iron	Polypropylene
QBY-10	0–0.8	0–60	6	5	1	7	0.3	★	★	★	★
QBY-15	0–1	0–60	6	5	1	7	0.3	★	★	★	★
QBY-25	0–2.4	0–60	6	7	2.5	7	0.6	★	★	★	★
QBY-40	0–8	0–60	6	7	4.5	7	0.6	★	★	★	★
QBY-50	0–12	0–60	6	7	8	7	0.9	★	★	★	/
QBY-65	0–16	0–60	6	7	8	7	0.9	★	★	★	/
QBY-80	0–24	0–60	6	7	10	7	1.5	★	★	★	/
QBY-100	0–30	0–60	6	7	10	7	1.5	★	★	★	/

Material Properties

	Nitrile Rubber (NBR)	Neoprene Rubber (CR)	Fluororubber (FKM)	PTFE	Food-Grade Rubber
Fuming Nitric Acid	×	×	△	△
Concentrated Nitric Acid	×	×	△	△
Concentrated Sulfuric Acid	×	×	○	△
Concentrated Hydrochloric Acid	×	△	△	△
Concentrated Phosphoric Acid	×	△	△	△
Glacial Acetic Acid	×	×	×	△
Concentrated Sodium Hydroxide	○	○	△	△
Anhydrous Ammonia	△	△	△	△
Dilute Nitric Acid	×	×	○	△
Dilute Sulfuric Acid	△	△	△	△
Dilute Hydrochloric Acid	×	○	△	△
Dilute Phosphoric Acid	×	×	△	△
Dilute Sodium Hydroxide	○	○	△	△
Ammonia Solution	△	△	×
Benzene	×	×	○	○
Gasoline	○	○	○	○
Petroleum	△	×	○	○
Carbon Tetrachloride	○		○	○
Carbon Disulfide	○		×	○
Ethanol	○	○	○	○
Acetone	×	△	×	○
Cresol	×	△	△	○
Acetaldehyde	×	×	△	○
Ethylbenzene	×	×	△	○
Acrylonitrile	△	△	×	○
Butanol	○	○	○	○
Butadiene	○	×	△	○
Styrene	×	×	△	○
Ethyl Acetate	×	×	×	○
Ether	×	×	×
Note: ○ — long service life; △ — average service life; × — not recommended. This table considers only corrosion resistance. Since PTFE has lower elasticity than rubber, actual service life will also be affected by pressure, pump stroke, impurities in the medium and other factors. Food-grade rubber is used specifically for food and beverage applications.

Application Examples

1. Cleaning tank bottoms: even with water padding, conventional methods cannot completely empty the oil. For a 5000 m³ tank, typically 1–1.5 t of oil remains each time. For tanks with a low-level drain, residual oil and water can be discharged to an oily wastewater treatment plant, but most light components volatilize during transfer and cause environmental pollution. A diaphragm pump greatly improves recovery efficiency.

2. Temporary tank transfer, loading/unloading and sampling: in refinery operation, oil products often need temporary transfer, truck loading, or sampling for analysis. To avoid contaminating permanent pipelines, a diaphragm pump connected to temporary lines can complete these tasks quickly and conveniently.

3. Recovery of heel oil in product tankers: for a 3000 t tanker equipped with a fixed screw pump, at least about 50 t of oil remains between bulkheads. Using a large-displacement diaphragm pump can significantly improve recovery.

4. Transfer of residual liquids containing gas and hydrogen sulfide: off-gas knock-out drums at refinery flare systems produce sour, corrosive liquids that must be collected and treated, otherwise they will cause severe acid corrosion to equipment. Diaphragm pumps are suitable for this duty.

5. Ceramic industry: used to transfer glaze slurry and to feed filter presses.

6. Dewatering manholes and trenches: during maintenance of underground pipelines, valves and channels, accumulated sewage and oily water must be removed. Submersible pumps can work, but these locations are usually far from power sources. A pneumatic diaphragm pump powered by compressed air cylinders can conveniently recover oily water and dewater the area.

7. Cleaning wastewater treatment basins and sludge pits: in wastewater plants, large amounts of oily sludge and silt accumulate and require cleaning. Diaphragm pumps provide flexible, labor-saving and efficient suction.

8. Draining sumps in LPG pump rooms and laboratories: these low-lying, hazardous areas are usually classified as high fire-risk zones. Using diaphragm pumps for drainage is safer and much more efficient than water or steam ejectors.

9. Other uses: QBY pneumatic diaphragm pumps are also advantageous for naphthenic acid transfer, truck loading of sodium sulfite solution, and handling benzene-based raw materials and many other corrosive or hazardous media.

Precautions

1. Vibration of this pump is very light, so foundation bolts are generally not required.

2. If contaminants enter the compressed air supply, pump starting and operation will be affected. It is recommended to install an air treatment unit (filter–regulator–lubricator) in the air line.

3. When handling media that are prone to solidification or freezing, a valve should be installed at the pump inlet. Before stopping the pump, close this valve first, then run the pump for several minutes to discharge the liquid inside, so that the pump can be restarted easily next time.

4. When replacing diaphragms, thoroughly clean the connecting rod and bushings and take care not to damage the white PTFE sealing rings. Reassemble strictly according to the original configuration.

 

OEM & Custom Solutions

Chaodun Pump offers OEM and ODM customization for QBY pneumatic diaphragm pumps, including material selection, diaphragm type, flow configuration, and corrosion resistance customization for specific industrial needs.

FAQs for Oversea Buyers

Q1: What is the power source of the QBY pump?
It uses compressed air, requiring no electricity, ensuring safety in explosive environments.

Q2: What liquids can it handle?
Corrosive, viscous, flammable, or toxic liquids, as well as slurries and solvents.

Q3: Can it run dry?
Yes, the QBY pump can safely run without damage.

Q4: What materials are available?
Fluoroplastic lined, polypropylene, aluminum, cast iron, and stainless steel.

Q5: Is it suitable for food applications?
Yes, with food-grade rubber diaphragm options.

Q6: Can it be submerged?
Yes, it supports submersible installation and operation.

Q7: Does Chaodun Pump offer OEM customization?
Yes, complete OEM and ODM services for material, flow, and diaphragm configurations.