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Do you know how a diaphragm pump works?

SF7000 airless sprayer diaphragm pump

A diaphragm pump uses the sprayer’s motor to create pulsing hydraulic
pressure (a hydraulic system using oil) to drive the pump. During the upstroke or intake stroke, the diaphragm is pulled up, creating a partial vacuum within the paint chamber. The vacuum pulls the inlet valve open and the outlet valve is pushed closed by the spring and paint pressure in the hose. Paint is then drawn into the paint chamber. On the down-stroke or pressure stroke,the inlet valve is closed and the outlet valve is forced open as paint is discharged to the sprayer hose and airless spray gun. Diaphragm pumps have a relatively small displacement volume. but The airless diaphragm pump must run fast (about 1725 cycles per minute) to deliver a steady flow of coating material.

So the advantage for a airless diaphragm pump sprayer is the stable pressure during spraying, no vibration, no pressure drop down. The stable pressure would generate the equal atomization and even finish.

Compare to piston pump paint sprayer, the diaphragm pump has better spraying performance. But the painter doesn’t like it because it sometimes couldn’t draw up the heavy paint, (they have to dilute the paint before spraying). But for thin paint, it is a perfect paint spray tool!

operating principle of diaphragm airless sprayer

operating principle of the diaphragm pump sprayer

seiwa airless

 


         
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Do you know how a diaphragm pump works?

A diaphragm pump uses the sprayer’s motor to create pulsing hydraulic pressure (a hydraulic system using oil) to drive the pump. During the upstroke or intake stroke, the diaphragm is pulled up, creating a partial vacuum within the paint chamber...
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Cleaning your airless sprayer properly and after every spray job is of the most importance! Proper care and maintenance make your paint sprayer long lifetime and work for you trouble free. Probably half our repair work is due to lack of and/or unsati...
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FAQ regarding our business

Q1: What's your MOQ minimum order quantity for formal order?

A: Our MOQ is 10-100 units depends on the model. For small pump or spray guns , the MOQ is 100. and for large capacity pump, the MOQ could be 10. We can accept 1 or 2 units for sample testing order.

Q2: What's your payment terms?

A: We could accept L/C, T/T and Paypal or Western Union, also accept the payment against B/L copy . We can offer credit payment term for our long year cooperated representatives.

Q3: What is the lead time?

A: Sample order: 3-5days, mass production 20-40 days for the formal order.

Q4: Can we put our logo on your products? Is there extra charge for it?

A: Yes, we accept the OEM order based on the order quantity. The color box package need extra cost for less container order.

Q5: What's your warranty?

A: our warranty is 12months limited warranty except the easily worn parts. and for the motor we offer 2 years warranty.

Q6. Which port do you ship your machines?

A: We ship from Ningbo port China. for the FOB price, we will bear the local freight charge and the forwarder fee / customs fee, and all the shipping cost / insurance cost / forwarder cost at destination port / import duty tax ... all will be beared by the buyer (or importer).

Q7. how can i buy your products?

A: if you're final user, please leave your mobile phone number to us, and we will ask our distributor / dealer to call you directly. if you want to be our distributor or representative, welcome to contact us by email or whatsapp. we can talk more details one by one, we're sure you would be satisfied with our quality / service and price.

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