Are you looking for an alternative for your Flow Divider circuit that will address the issues of multiple division, irregular percentage splits, adjustable ratios, inlet flow variance versus accuracy and pressure drop? If so, an alternative works for dividing pump flow only. If you need combining too, you might have to stick with the traditional flow divider / combiner (or read next week’s article to see a combining solution). |
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Flow dividing circuits are used in many mobile applications to make full use of a varying input flow. Spool type dividers can be integrated into manifolds and are available in many sizes and fixed ratios. Although they can be cascaded, they are individually limited to a 2-way split. The valve ratios (i.e. 50/50 or 20/80) are fixed and factory preset by varying each spools flow specifications.
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Tags:
cartridge valves,
proportional valves,
Load Sensing,
Cartridge Valve Pressure Compensators,
benefits of cartridge valves,
Flow Divider,
hydraulic manifold design,
pressure compensators
A pressure compensator maintains a constant pressure drop across a metering device regardless of the load induced pressure on the function. There are only two types of compensation methods used in hydraulic flow control functions. These are pre- and post-style compensation. Pre and Post refer to the position of the pressure compensating element relative to the metering element. A pre-style pressure compensator is positioned upstream of the metering element (a proportional valve) and a post-compensator is positioned downstream of the metering element. There is also a sub-category of these, which adds load sharing (this is sometimes called flow sharing). Using current cartridge valve technology, load sharing is limited to post-compensation circuits.
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Tags:
cartridge valves,
proportional valves,
pressure control valve,
directional control valve,
hydraulic cartridge valves,
pressure compensators,
pressure compensation,
Piloted,
Spool-Type Logic Element,
proportional directional valves,
pre-compensated hydraulic systems,
post compensated hydraulic systems
| Someone recently joked with me that I’ve never created a circuit that didn’t have at least one Logic Valve in it. HydraForce model numbers for these valves begin with the prefixes EP, EPFR and EV. Typically, these valves are piloted-closed, vented-open, or used as pressure compensators or regulators. I use them often because they are versatile, and they have low pressure-rise and pressure-drop characteristics. |
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On our catalog pages for these valves, we describe them as: “hydraulic directional element, with multifunction potential when used with other directional, pressure, or flow control devices.” Talk about a vague (albeit true) statement. So, to demystify this situation a little, I started to think about all the different ways spool-type logic valves can be used in integrated circuits. I’ve sketched up some generic circuits that show different ways in which we use spool type logic valves:
Tags:
cartridge valves,
pressure control valve,
logic valves,
pressure compensators,
Bypass Pressure Compensator,
Sequence Valve,
Accumulator Charging Circuit,
cartridge
| Someone recently joked with me that I’ve never created a circuit that didn’t have at least one Logic Valve in it. HydraForce model numbers for these valves begin with the prefixes EP, EPFR and EV. Typically, these valves are piloted-closed, vented-open, or used as pressure compensators or regulators. I use them often because they are versatile, and they have low pressure-rise and pressure-drop characteristics. |
|
On our catalog pages for these valves, we describe them as: “hydraulic directional element, with multifunction potential when used with other directional, pressure, or flow control devices.” Talk about a vague (albeit true) statement. So, to demystify this situation a little, I started to think about all the different ways spool-type logic valves can be used in integrated circuits. I’ve sketched up some generic circuits that show different ways in which we use spool type logic valves:
Tags:
cartridge valves,
pressure control valve,
logic valves,
pressure compensators,
Bypass Pressure Compensator,
Sequence Valve,
Accumulator Charging Circuit,
cartridge
