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Home Parker Community Technologies Hydraulics Forum VFO system vs the older CPU system.
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  • Date PER AGESSON
    PER AGESSON
  • Date 24 Jan 2019 1:51 PM
  • Replies 3 replies
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VFO system vs the older CPU system.

PER AGESSON
By  PER AGESSON over 1 year ago

Hi all.

Long time fan of your products all back to the era of Monsun-Tison in the 1970's, later on VOAC. The directional valves have dominated CTL logging equipment in Scandinavia since then.

community.parker.com/.../variable-flow-open-center-delivers-constant-efficiency

Read this article and wonder if this VFO system is basically the same as the CPU system that was marketed by Monsu-Tison VOAC 30+ years ago? If so, is VFO just a new term for marketing the system in North America?

  1. Is the orifice at valve inlet approx 0.7 mm diameter?
  2. Can valve spools proportionally vary the the pump signal pressure in the open center gallery?
  3. Or does the open center gallery close just before workports connects the power gallery to the actuator?

Cheers

Per A

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  • asimriazadwords@gmail.com
    asimriazadwords@gmail.com 1 month ago

    VFO allows you to combine the efficiency of a piston pump system with the operator's feel and controllability of an open center valve. Open center technology gives a smoother, less stiff control feeling, compared to Load Sensing technology, which is commonly used with variable displacement piston pumps.

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  • PER AGESSON
    PER AGESSON 1 month ago in reply to asimriazadwords@gmail.com

    BTW, this is a very simple and "slick" way to improve the CPU system to get positive properties from an OC CF system

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  • PER AGESSON
    PER AGESSON 1 month ago in reply to asimriazadwords@gmail.com

    BTW, this is a very simple and "slick" way to improve the CPU system to get positive properties from an OC CF system

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