Double Pilot Operated Check Valves

[TheOldHokie]

"You might wonder why all valves don't have this feature. Briefly, jerkiness. The pressure is held in the pressurized line until pressure building in the other line releases the ball/poppet/shuttle. Then the pressure is equalized suddenly. "
Wasn't aware of the jerky reaction, does a DPOVC cause jerky reaction?
I have a flail mower with tilt that has leakage when tilted and was considering a DPOVC. Should I be concerned about the jerky reaction?
I already have that with no flow restrictors.

Its more chatter and noise than jerkiness and it would not concern me in the least. Drifting implements concern me a lot.

Dan

 

[imarobot]

Its more chatter and noise than jerkiness and it would not concern me in the least. Drifting implements concern me a lot.

Dan

Me too, thanks

 

[PoTreeBoy]

"You might wonder why all valves don't have this feature. Briefly, jerkiness. The pressure is held in the pressurized line until pressure building in the other line releases the ball/poppet/shuttle. Then the pressure is equalized suddenly. "
Wasn't aware of the jerky reaction, does a DPOVC cause jerky reaction?
I have a flail mower with tilt that has leakage when tilted and was considering a DPOVC. Should I be concerned about the jerky reaction?
I already have that with no flow restrictors.

I've given this a little more thought. My setup has the checks in the valve, not on the cylinder. The trapped volume and/or the elasticity of the hoses could contribute, or maybe the Husco valve is more prone to it, or I'm full of ___. But for a tilt application I can see it.

 

[TheOldHokie]

I've given this a little more thought. My setup has the checks in the valve, not on the cylinder. The trapped volume and/or the elasticity of the hoses could contribute, or maybe the Husco valve is more prone to it, or I'm full of ___. But for a tilt application I can see it.

I dont think your regularity or veracity are in question

Another factor to consider is the pilot ratio of your stabilizer checks. Is that documented? The pilot ratio of the checks used on a top link cylinder is about 3:1. And if the seals on your cylinders are leaking the static pressure in the locked circuit can get pretty high exacerbating the problem.

Dan

 

[PoTreeBoy]

You're talking above my pay grade now, for sure. I'm sure it's documented in Husco's archives somewhere, but I don't have a clue. As long as it works, I'm good with it.

 

[TheOldHokie]

You're talking above my pay grade now, for sure. I'm sure it's documented in Husco's archives somewhere, but I don't have a clue. As long as it works, I'm good with it.

Pilot ratio is the ratio of pilot cross sectional area to the check valve poppets cross sectional area and determines the pilot pressure needed to open the check against any given load. Higer ratios reduce the pressure needed but results in less control of the load especially at higher load pressures.

If your stabilizer cylinders are leaking you could also be seeing abnormally high locked cylinder pressures..

Dan