Pump Noise (Part 3) – Product with PCFV

Previously on iHydrostatics N14, various research works on the piston pump noise reduction was summarized. It can be concluded that most of the researches focused on the valve plate modification, and proposed solutions all have its own advantages and disadvantages. If you want to review this topic again, please reply N14 in Wechat iHydrostatics to get the detailed explanations. Any questions are always welcomed, iEditor encourages you to leave your comments in iHydrostatics QQ Group: 426372753.


In Pump Noise (Part 3), iEditor will focus on PCFV solution applied on real product. Practice proves everything and filters out the best for product market. How do the real products utilize this solution for performance optimization?

1Linde HPR-02

Linde has launched an axial piston pump HPR-02 by connecting an additional pressure chamber which was named SPU silencer. The adaptive SPU can reduce flow and pressure pulsations in the regulating pump over the entire range of operation – without loss of power. HPR-02 with SPU reduces pulsation level by up to 70 %.

2Parker P2/P3

Parker P2/P3 pump design uses a pre-compression (ripple) chamber design in the pump to reduce the output flow pulsation. In the first part of the compression phase, an internal chamber – filled with fluid under pump output pressure – is connected to the piston coming from the low-pressure side. Fluid now starts to flow back into the chamber to refill it.

Chamber refill ends with refill time covering 25° of rotation. As the volume to bring the piston chamber to 350 bar is reduced by the ripple chamber input, now a lower average flow is required from the pressure chamber to have it refilled when the next piston gets connected. As a result, the peaks in the flow are reduced by more than 50%. The whole system is less excited by the reduced flow pulsation and is quieter. Built to a power unit and incorporated into a hydraulic system, the lower pulsation causes a total reduction in primary and secondary noise by 3 dB(A) typical, and in some cases even up to 5 dB(A).

Pulsation reduction with a pre-compression (ripple) chamber at 1° of rotation where compression starts.Then advances to 12° rotation where compression ends and chamber refill startsAnd continues to 35° where chamber refill ends3Eaton DuraForce

Because of the cooperation between Linde and Eaton, the similar product has also been added into Eaton’s product portfolio, which belongs to DuraForce series.

4More of PCFV
PCFV(Pre-Compression Filter Volume), which is also called Pressure Chamber in real products, proves its advantages in the real working conditions without high additional cost. But is it just simple to add a pressure chamber in a pump? The answer is absolutely NO!
What are the best parameters for the pressure chamber? How can this chamber achieve highest performance during operations? All the secrets will be disclosed in the next episode!
Don’t go away, keep up with iHydrostatics!

REFERENCES

[1]. Linde Technical Manual.
[2]. Eaton Technical Manual.
[3]. Parker Technical Manual.
[4]. Linde Hydraulics Website. Http:// www.linde-hydraulics.com /.
[5]. John Jones. Hydraulic Pump Noise Reduction. Hydraulic Pump Div., Parker Hannifin Corp.

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