QBK/QBY/DBY Diaphragm Pump Diaphragms
Replacement diaphragm pump diaphragms in NBR, PTFE, Santoprene-type elastomer and F46, with 45 listed configurations. Some fluoropolymer options require material confirmation. Each option is one diaphragm, not a pair. Confirm pump fit, dimensions and material before ordering; contact IKSONIC for China factory and wholesale supply.
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Description
Diaphragm Pump Diaphragms for Replacement and Maintenance
IKSONIC supplies diaphragm pump diaphragms for replacement and maintenance enquiries involving QBK, QBY and DBY pump applications. This range includes 45 listed configurations across NBR, PTFE, Santoprene-type elastomer and F46, with certain fluoropolymer entries requiring material confirmation. As a China manufacturer and supplier, IKSONIC welcomes factory-direct and wholesale enquiries from maintenance teams, equipment buyers and distributors. Select by material, dimensions and construction, not by pump family alone.
Four Material Options
- NBR: Black nitrile rubber options described for oil resistance, with 15 QBK/QBY model and size combinations.
- PTFE: Listed for corrosion resistance in eight model-specific configurations and three M8-labelled configurations. Seven additional fluoropolymer entries require material confirmation because their option and photograph labels differ.
- Santoprene-type elastomer: Options described for wear resistance, including four blue holeless sizes and three QBK/QBY configurations. Confirm the exact compound when ordering; this description does not certify branded resin origin.
- F46: Options described for corrosion resistance, including four holeless diameters and a separate 150 mm diaphragm.
Colour and photographs are identification aids only; confirm the material, dimensions and exact order option together. Entries marked Material to be confirmed must not be treated as a confirmed PTFE or F46 specification.
These descriptions are qualitative selection guidance, not operating ratings or a universal compatibility guarantee. Confirm the pumped medium, concentration, operating temperature and pressure before choosing a compound. No application-specific chemical-resistance certification or temperature and pressure limit is stated for these options.
Identify the Correct Replacement
Check the pump nameplate and inspect the existing diaphragm before ordering. Record the outer diameter, centre fixing, hole arrangement and diaphragm profile, then compare the complete construction with the required replacement. Where the model is unknown, an outer-diameter measurement in millimetres and clear photographs can help identify the relevant option, but diameter alone does not establish interchangeability.
The same QBK/QBY model can appear with different listed sizes. For example, the 50 and 65 options include 300, 330 and 340 mm, while the 80 and 100 options include 400, 420 and 450 mm. Keep these alternatives separate. Confirm any dimensional discrepancy before choosing a replacement.
Diaphragm Pump Diaphragms: Models and Sizes
All 45 options are listed below in catalogue order. Each option is for one diaphragm, not a pair. Size-100 fluoropolymer entries are listed for QBK only; QBY compatibility is not stated in those option names. DBY is included in the general application description, but no individual DBY option is assigned in this table. Confirm DBY fit separately.
| No. | Material | Pump model / configuration | Listed size / designation | Order unit |
|---|---|---|---|---|
| 1 | NBR (nitrile rubber) | QBK/QBY-15 | 140 mm | 1 piece |
| 2 | NBR (nitrile rubber) | QBK/QBY-25 | 230 mm | 1 piece |
| 3 | NBR (nitrile rubber) | QBK/QBY-40 | 230 mm | 1 piece |
| 4 | NBR (nitrile rubber) | QBK/QBY-50 | 300 mm | 1 piece |
| 5 | NBR (nitrile rubber) | QBK/QBY-65 | 300 mm | 1 piece |
| 6 | NBR (nitrile rubber) | QBK/QBY-50 | 330 mm | 1 piece |
| 7 | NBR (nitrile rubber) | QBK/QBY-65 | 330 mm | 1 piece |
| 8 | NBR (nitrile rubber) | QBK/QBY-50 | 340 mm | 1 piece |
| 9 | NBR (nitrile rubber) | QBK/QBY-65 | 340 mm | 1 piece |
| 10 | NBR (nitrile rubber) | QBK/QBY-80 | 400 mm | 1 piece |
| 11 | NBR (nitrile rubber) | QBK/QBY-100 | 400 mm | 1 piece |
| 12 | NBR (nitrile rubber) | QBK/QBY-80 | 420 mm | 1 piece |
| 13 | NBR (nitrile rubber) | QBK/QBY-100 | 420 mm | 1 piece |
| 14 | NBR (nitrile rubber) | QBK/QBY-80 | 450 mm | 1 piece |
| 15 | NBR (nitrile rubber) | QBK/QBY-100 | 450 mm | 1 piece |
| 16 | Material to be confirmed | QBK/QBY-15 | 140 mm | 1 piece |
| 17 | Material to be confirmed | QBK/QBY-25 | 230 mm | 1 piece |
| 18 | Material to be confirmed | QBK/QBY-40 | 230 mm | 1 piece |
| 19 | PTFE | QBK/QBY-50 | 300 mm | 1 piece |
| 20 | PTFE | QBK/QBY-65 | 300 mm | 1 piece |
| 21 | PTFE | QBK/QBY-50 | 330 mm | 1 piece |
| 22 | PTFE | QBK/QBY-65 | 330 mm | 1 piece |
| 23 | Material to be confirmed | QBK/QBY-50 | 340 mm | 1 piece |
| 24 | Material to be confirmed | QBK/QBY-65 | 340 mm | 1 piece |
| 25 | PTFE | QBK/QBY-80 | 400 mm | 1 piece |
| 26 | PTFE | QBK-100 | 400 mm | 1 piece |
| 27 | PTFE | QBK/QBY-80 | 420 mm | 1 piece |
| 28 | PTFE | QBK-100 | 420 mm | 1 piece |
| 29 | Material to be confirmed | QBK/QBY-80 | 450 mm | 1 piece |
| 30 | Material to be confirmed | QBK-100 | 450 mm | 1 piece |
| 31 | Santoprene-type elastomer | Blue, no peripheral mounting holes; model not specified | 125 mm | 1 piece |
| 32 | Santoprene-type elastomer | Blue, no peripheral mounting holes; model not specified | 170 mm | 1 piece |
| 33 | Santoprene-type elastomer | Blue, no peripheral mounting holes; model not specified | 225 mm | 1 piece |
| 34 | Santoprene-type elastomer | Blue, no peripheral mounting holes; model not specified | 275 mm | 1 piece |
| 35 | F46 | No peripheral mounting holes; model not specified | 130 mm | 1 piece |
| 36 | F46 | No peripheral mounting holes; model not specified | 170 mm | 1 piece |
| 37 | F46 | No peripheral mounting holes; model not specified | 230 mm | 1 piece |
| 38 | F46 | No peripheral mounting holes; model not specified | 275 mm option label; diameter to be confirmed | 1 piece |
| 39 | Santoprene-type elastomer | QBK/QBY-15 | 140 mm | 1 piece |
| 40 | Santoprene-type elastomer | QBK/QBY-25 | 230 mm | 1 piece |
| 41 | Santoprene-type elastomer | QBK/QBY-50 | 340 mm | 1 piece |
| 42 | PTFE | Diaphragm; model not specified | 110*M8 | 1 piece |
| 43 | PTFE | Diaphragm; model not specified | 142*M8 | 1 piece |
| 44 | F46 | Diaphragm; model not specified | 150 mm | 1 piece |
| 45 | PTFE | Diaphragm; model not specified | 115*M8 | 1 piece |
Rows 16, 17, 18, 23, 24, 29 and 30 require material confirmation. Verify whether PTFE or F46 is required for the specific pump and proposed diaphragm. The F46 275 mm option in row 38 has a conflicting 280 mm photograph caption; confirm its actual diameter before ordering. These sizes are not stated to be interchangeable.
The 110*M8, 142*M8 and 115*M8 entries retain their listed designations. A unit is not explicitly included in those option names, so confirm dimensions and fixing details before ordering. The 150 mm F46 option is separate from the four F46 holeless options; its hole arrangement is not specified here.
Ordering Diaphragm Pump Diaphragms
For an accurate quotation, provide the selected row or full option name, required quantity, pump model, measured dimensions, diaphragm photographs and operating medium. Identify the material required and any documentation needed for your application. Ask for current availability and lead time rather than assuming a particular option is in stock. Prices are supplied by enquiry, and quantities refer to individual diaphragms.
Contact IKSONIC for China factory supply, replacement-part identification and wholesale diaphragm enquiries. Include all dimensional and service requirements so the proposed option can be checked before an order is confirmed.
Frequently Asked Questions
Does one unit include two diaphragms?
No. Each listed option represents one diaphragm. Order the quantity required for your maintenance job; a pair is not implied.
Can I choose solely from the QBK or QBY model number?
No. Several models have multiple listed sizes. Match the material, dimensions, fixing and profile as well as the model number.
Are all of these options confirmed for DBY pumps?
No. DBY appears in the general application description, but individual DBY model-to-size assignments are not provided. Confirm the specific replacement against your pump and existing part.
What does holeless mean in this list?
Here, holeless describes the outer flange without peripheral mounting holes. The illustrated styles still have a centre opening, so it does not mean completely unperforated. Confirm the centre fixing. The separate 150 mm F46 option has no specified hole arrangement.
What if the measured diameter differs from a listed size?
Confirm the difference and the complete installation geometry before selecting a replacement. A similar diameter does not establish interchangeability.
Why do some rows say Material to be confirmed?
The option list and photograph captions use different fluoropolymer descriptions for these entries. Confirm the required material and exact component before ordering; similar dimensions do not resolve a material difference.
Can the M8-labelled options be ordered as standard metric dimensions?
Confirm them first. The exact listed designations are preserved, but the diameter unit and complete fixing specification are not stated in those option names.
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