Double Diaphragm pump

The maximum operating pressure must be greater than the pressure in the piping system, otherwise the pump will stall.

There are a number of diaphragm pump manufacturers and entering these words into an internet search engine will prove illuminating.

thanks ,but how could suction pressure could affect selection of the diaphragm pump

The suction pressure must not be so low that the liquid boils.

As suction pressure increases, the pump will have less work to do, so it will run faster.

ok,how could high suction pressure affect the pump components not performance

what is the difference between NPSH for centrifugal and diaphragm pump?

what are the specific factors which determine pump pressure and flow rate separately?

<...how could high suction pressure affect the pump components....>

If the pump materials have been selected correctly for compatibility with the fluid, none at all.

<...what is the difference between NPSH for centrifugal and diaphragm pump?...>

None at all.

<...what are the specific factors which determine pump pressure and flow rate separately?...>

The fluid and its physical properties, and the design of the piping system through which it flows.

how could pump its self determine flowrate and pressure (for example in centrifugal pump impeller rotation determine flowrate and pump speed triangle)

any one have a relation relating diaphragm pump's power,pressure and flowrate ?

It is a function of the piping system's pressure/flowrate characteristic, the air pressure applied to the pump, and the pumped fluid's physical properties.

Here are some product specs of really tough, dependable diaphragm pumps in various sizes: Diaphragm Pumps

Hope this information helps you in your search!

thank you

diaphragm pump

vacuum pump