dosing pump

Hewlett Packard does not make dosing pumps.

Why not make the very small effort to go first to google (or an other search engine) and try to find some thing and ask cr4 if it is still not clear ?

What is a HP pump ? do you mean Horse Power as power unit? Hydropneumatic? or High Pressure ? or any thing else? Questions as you formulate cannot be answered.

Hello girishpurohit

Evidently the Posters above did not think much about your request.

It seems folks these days do not take the trouble to analyze the question properly, just race in with an answer, hoping it is helpful.

I have done the basic research for you, and if you click on the hyperlink, it should help you with your search.

Your answer is here: HP Products

I trust that the above link will assist you in locating the correct detail about the HP dosing pump.

Kind Regards....

Harry Potter isn't a dosing pump, he's a child sorcerer........ Or did Lord Voldermort turn him into a dosing pump? Hhhhhhhhhhhmmmmmmmmmmmmmmmm!!!!!!!!

High pressure dosing pumps are usually either piston pumps or some sort of diaphragm pump.. What else do you want to know?

high pressure pump

they are very small in size

how they build up 100kgf per square centimeter pressure, they are reciprocating type pump?

Yes, they are usually a reciprocating pump.. They build up very high pressure because the piston size is very small. The pistion load is a function of the piston face area times the discharge pressure. With a small face area, the force required to generate a very high pressure is not high. The discharge pressure is a function of the discharge valve, which is a type of check valve, the pressure inside the cylinder must be high enough to open the valve.

Because of the small piston size, the flow rate is pretty small, that is why they are used for low flow high pressure applications.

What is the application? Is it catalyst injection or something else?

The discharge pressure is NOT a function of the relief or discharge valve but of the LOAD. The discharge valve has only the function to LIMIT the maximal pressure in order to avoid a pump destruction.

Not a function of relief valve setting, no. But directly related to the opening force for the discharge check valve in the cylinder. That is how recip pumps work.

I am not sure I understand your comment. Maybe we are saying the same thing in differnt ways?

From the following article…

http://www.pump-zone.com/article.php?articleid=337

As a cavity opens when a plunger/piston retracts, the fluid is admitted through an inlet check valve. When the plunger/piston reverses, the inlet check valve closes, and the cavity reduces when the plunger/piston extends. The outlet check valve opens and the fluid is forced out by the plunger/piston.

No, we meant different aspects. The check valves have a very LOW pressure drop in order to avoid not necessary losses. The inlet check valve has a low pressure drop to avoid cavitation which appears when pressure becomes too low in the inlet section.

What i said is that in all volumetric pumps theoretically the pressure can grow as much as the volume compression continues. To protect the systems there are always relief valves which will bleed to the aspiration side if the pressure is too high and reaches the set limit.

Some of the high pressure pumps do not have inlet check valves as, for instance, those used in diesel engines they have only outlet check valves. Some other high pressure pumps work with a distribution which connects the cylinder either with the inlet or the outlet.

The outlet check valve will open when the internal pump pressure will exercise a force higher than the valve spring force + the force given by the system pressure multiplied by the check valve area. It is not the valve but the load which gives the pressure in the pump since the spring for above mentioned reasons is usually very weak. It has only to allow a movement fast enaugh of the check valve at the dead point when the piston starts to move in the suction direction.

Applicaton of HP dosing pump is the dosing of Hydragine into the boiler drum in Thermal power plant.

Hello,

I am not sure but I presume <hydragine> is the same as <Hydrazine>.

If Yes, the following link can be helpfull:
http://www.prominent.com/DesktopDefault.aspx/tabid-92/60_read-42244/

If No, you could still contact a ProMinent company, because Hich pressure (dosing) pumps is their core business.

regards

Ahah! Another snippet of information, though not quite enough.....

What is the pressure the pump is required to achieve?

Why has this information been withheld in the original post?

100 kgf/cm2 is the pressure is required. I want to the know the phinomina behind this how this high pressure is achieved by a small piston pump . I think you understand my point What i want to say so, Solve my problem

I posted explainations and animations... I give up..

last explanation:

you do not have the right understanding of the notion "pressure". To give you an example there are high pressure hand pumps with plungers about 4 to 5 mm diameter with which pressures as high as 2.000 bar can be generated.

A plunger pump can go as high in "pressure" as the plunger resists in compression and the seals can keep against leaks.

Let say you act mith a force of 100 N on a plunger with d= 2mm you generate (neglecting frictions) 7.96 N/mm^2, if you reduce the plunger to 1mm diameter the pressure you can generate with SAME force is 31.8 N/mm^2. The pressure you mention:100 kgf/cm^2= 100x9.81/100=9.81 N/mm^2 is in fact NOT a big one.

It would be better if you use the ISO unit for force which is the "N" defined as the force giving an acceleration of 1m/s to a mass of 1kg.

On the other side you have the on the plunger acting "force" which limits in fact the "pressureé the pump could generate.

Combining this last explanation with previous either you understand where you have a lack of understanding or you buy a book about fluid dynamics and statics and learn the basics.

Good luck.

You seem to be hung up on the smallness of the pump. The fact is that it has to be small in order to reach high pressure. You could not do it in a big pump.

Yes if teh acting force is small in fact there are pumps for 1.000bar and more with quite big diameters but with high power supplies and big forces on the plungers.

It is enough to look at the water jet cutting systems.