dump trailer speed control

[windboarder]

You said needle valve, we replied pump damage.

so a larger cylinder is the only option?

 

[oldnslo]

The attachments are the two components required for the priority flow control system for a D03. You will also need longer mounting bolts of the appropriate size. These are typical either 10-24 or 5 mm.

This sandwich block or stack module will meter the flow into P port and bypass the excess flow to tank.

You will have to check with your local Sun distributor for availability.

 

[4570Man]

I have six dumps fully heaped with wet clay and not a problem or even a slow down.

I’m surprised a cylinder that small is capable of lifting the bed up and lifting high enough to dump. Care to post a picture? Here’s a dump I built with a much bigger cylinder and it has trouble dumping a big load. It’s a 4 or 4.5x45” a little shorter would actually be better. My other truck has a 5x30” cylinder.

 

[CADplans]

so a larger cylinder is the only option?

There are a dozen answers that will work.

The cylinder is probably ;
1) the lowest cost to implement (especially if you happen to find a suitable cylinder on eBay for $39)
2) most reliable
3) easiest to implement
4) easiest to remember how to use
5) will result in the most user satisfaction

 

[windboarder]

2 inch cylinder would be around 9 seconds vs 5 seconds for 1 1/2 inch

Since the picture of power unit shows D03 style valve you can purchase stack modules with priority flow control that mount between the valve and subplate no extra plumbing required

Note: if gravity down this will not change down time

Can you also tell me what the speed would be for a 2 1/2 and a 3 inch cylinder?

 

[RickB]

even with the stack modules with priority flow control option?

With a needle valve.

 

[RickB]

Can you also tell me what the speed would be for a 2 1/2 and a 3 inch cylinder?

Calculate the various areas of the bore circles and express them as a fraction of the 5 seconds measured with the 1.5 inch bore cylinder.

 

[RickB]

I’m surprised a cylinder that small is capable of lifting the bed up and lifting high enough to dump. ]

Me as well.

 

[oldnslo]

If a larger cylinder is used I would suggest lowering the pressure so that you don’t bend or destroy your dump trailer.

Lift force = pressure times cylinder area

Examples
1 1/2 inch bore and 2000 PSI = 3500 lbs

2 1/2 inch bore at 2000 PSI = 9800 lbs

 

[windboarder]

Calculate the various areas of the bore circles and express them as a fraction of the 5 seconds measured with the 1.5 inch bore cylinder.

I wish i was a good as you are,is that the easiest way to find out?

 

[windboarder]

If a larger cylinder is used I would suggest lowering the pressure so that you don’t bend or destroy your dump trailer.

Lift force = pressure times cylinder area

Examples
1 1/2 inch bore and 2000 PSI = 3500 lbs

2 1/2 inch bore at 2000 PSI = 9800 lbs

Is that as easy as lowering the Relief valve on the pump?

 

[oldnslo]

Is that as easy as lowering the Relief valve on the pump?

Yes, system pressure is limited or set by the relief valve


To figure cylinder velocity

Flow = velocity times area

Flow = GPM x 231/60 = cubic inches second
Velocity inches per second
Area square inches

 

[windboarder]

Yes, system pressure is limited or set by the relief valve


To figure cylinder velocity

Flow = velocity times area

Flow = GPM x 231/60 = cubic inches second
Velocity inches per second
Area square inches

can you tell me if my math is close 19.4 seconds for 3x14 bore 13.59 for 2.5x14 bore

 

[oldnslo]

can you tell me if my math is close 19.4 seconds for 3x14 bore 13.59 for 2.5x14 bore

yes, those times look close.

for reference: double the diameter = four times the area so a 3 inch cylinder will be 4 times slower than an 1 1/2 cylinder

 

[4570Man]

Me as well.

It must pivot close to the center and not take much force to dump.