HydraForce Insider Blog

Using a Proportional Pressure Control as a Directional Control Valve

Posted by David Price on Fri, May 13, 2011 @ 10:05 AM

With Programmable Electronic Controls becoming more prevalent in many hydraulic systems it’s a good time to look at one alternative to Proportional Direction control made possible with the advent of electronic closed loop control.

 

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Tags: cartridge valves, proportional valves, Directional Control Valves, proportional pressure control valve, solenoid operated four way valves, directional control valve, hydraulic manifold design, ecu's, hydraulic circuit

Diagnosing Polarity Issues of Solenoid Valves

Posted by David Price on Wed, Mar 09, 2011 @ 15:03 PM

In some very rare cases -- less then 1% of applications-- certain system criteria may have an impact on the shifting of dual coil, 3-position, 4-way and 5-way valves. Most applications using these dual coils valves have no issues at all. However, should your valve appear to be shifting slowly, sluggishly, or in extreme cases, not at all, the bright side is; there is a very simple solution! No, the solution is not beating the valve with a wrench (although we have heard this) but a simple switch of the (+) positive and (–) negative terminals, on ONE of the coils, will most likely perk up your system.

I once went on a troubleshooting call where the top coil of a dual coil valve would not shift the valve, but instead would actually energize the bottom coil position of the valve. Huh, say what? Upon investigating, it turned out that there were four issues going on: 1) the machine's electrical system had a residual trickle voltage in the system that never dropped current to zero when de-energizing the bottom coil; 2) the coils had diodes; 3) fine particle contamination; and 4) both coils had the same polarity. Polarity, in this case, means that both coils used the same terminal for the plus (+) side/battery and the other terminal for the minus (-) side/ground.

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Tags: cartridge valves, solenoid operated four way valves, solenoid operated five way valves, solenoid valves

Solenoid Valves and Daniel Bernoulli (Friend or Foe)

Posted by David Price on Wed, Mar 09, 2011 @ 10:03 AM

Daniel Bernoulli – this 18th century Swiss mathematician – has left quite the impact on the modern fluid power industry. One of his more popular discoveries is known as the Bernoulli Principle. This principle states that an increase in a fluid's speed decreases its pressure. If this is true, and we know it is, then the opposite must also be true: that a decrease in a fluid's speed increases its pressure. This principle applies to both the lifting of a wing on an airplane, as well as the lifting of a cartridge valve poppet.

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Tags: cartridge valves, solenoid operated four way valves, Bernoulli Principle, cartridge valve poppet, HydraForce, solenoid operated three way valves, solenoid-operated direct-acting spool valves, spool-type cartridge valves, solenoid operated five way valves