Model: QBY-25 stainless steel (1 inch), equivalent to QBK-25 type requests
A buyer asked for a 1 inch SS304 chemical diaphragm pump with F46 diaphragms. What F46 means, how we matched the request, and when to choose 316 instead.
| Flow Rate | Up to 2.4 m³/h |
|---|---|
| Head | Up to 60 m |
| Power | Compressed air, no motor |
| Inlet / Outlet Diameter | 25 mm (1") |
| Material | Stainless steel 304 body, F46 (FEP) diaphragms |
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The request was short: a stainless steel chemical diaphragm pump, model QBK-25, body in 304 stainless steel with F46 diaphragms. QBK-25 is a model name used by other makers, so the first job was to translate it into our own range. That turned out to be simple. It is a 1 inch air-operated diaphragm pump, and our 1 inch stainless steel QBY with F46 diaphragms matches it. The pump was in stock and went out without waiting for production.
F46 is the Chinese trade name for FEP, a fluoroplastic from the same family as PTFE. When a Chinese buyer asks for an F46 or ‘Teflon’ diaphragm on a diaphragm pump, this is what they mean. It is chosen for the same reason as PTFE: very wide chemical resistance, which makes it the usual partner for a stainless steel body on chemical duty.
304 stainless steel handles most mild acids, alkalis and cleaning chemicals. Where the liquid contains chlorides, such as salt water or some acid mixtures, 316 is the safer choice because of its molybdenum content. Our QBYS stainless steel pumps are available in both, and the price difference is worth discussing before ordering.
If you have a model name from another brand, send it to us with the body and diaphragm material. In most cases we can match it from stock.
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