Linde old PV pump

[PaoloB]

Looking for some information above Linde PV pumps.
Encounter here in PH an old unit and we plan to replace with a modern pump.
Don't know if pump controller is PC, LS or HP control.
Thanks

 

[LittleInch]

Not sure how we're supposed to guess.

Got a P& ID?

What does the pump do in the system?

This is what kind say

https://lhy.com/gb/products/pumps/

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[FluidPowerUser]

Ignoring the old pump for a moment, what do you want the replacement pump to do?

Is energy efficiency the top priority?

Software control and engineering?

Functional safety?

If you want a direct replacement, can you provide more details of the Linde pump? Perhaps a picture of the name plate with the full part number?

 

[PaoloB]

No schematics at the moment, pump drives the main rotation motor of the Casa Grande drilling machine, very old machine that operator pull a manual lever to gain displacement of the pump. Pump control is similar to an old Kawasaki NV series with a lever at the top.

 

[FluidPowerUser]

OK, what do you want? Old type of pump with manual displacement control or modern pump with electronic displacement control?

I am not aware of any modern pump with manual control of the swash plate. Parker, Rexroth, Linde and Kawasaki don't offer them as a standard product. There are some high pressure axial piston pumps with manual displacement control, but your chances of having one with a similar lever are very low.

The rules for safety and operator comfort are different these days. It's not to say that it's not possible to control a swash plate with a big level, but doing it with some profit is difficult and modern machines have electronic control that replaces the level with a potentiometer. Better control, easier control, safer control and much lower cost.

 

[PaoloB]

Client still prefer manual displacement control.

 

[FluidPowerUser]

Preference is one thing, availability is another.

The fact of the matter is that electronic control of machines is cheaper than mechanical controls. Lots of operators complain about not being able to feel the machine because the electronics controls don’t have the feedback. The argument for mechanical controls wasn’t strong enough because software allows more automation and more data to be collected and lots of other options.

Passenger cars have followed Tesla’s lead in removing expensive dials, knobs and switches and replacing them all with a touchscreen.

Machine controls have gone the same way and so, pumps that respond to electronic inputs are preferred to pumps with mechanical inputs.

From a safety perspective, a proportional solenoid can easily change the displacement of a pump if the pressure goes high, a mechanical pump cannot and is reliant on expertise of the operator to prevent stalling the engine or breaking the machine.

Electronic controlled pumps are cheaper and preferable to the manufacturers.

 

[PaoloB]

Thanks for the input! Will try to convince them for the use of electronics.