Maybe a Step 'Backwards', But Handy?

[Spiffy]

Re: Maybe a Step \'Backwards\', But Handy?

Since the rod side displaces less fluid, I think you'd need an expandable bladder, but then it would have some spring back effect as a bonus!

Sounds like a neat idea, even if that means I'll have one less good reason too talk you green guys into manual valves. /forums/images/graemlins/frown.gif /forums/images/graemlins/grin.gif

 

[Spiffy]

Re: Maybe a Step \'Backwards\', But Handy?

Since the rod side displaces less fluid, I think you'd need an expandable bladder, but then it would have some spring back effect as a bonus!

Sounds like a neat idea, even if that means I'll have one less good reason too talk you green guys into manual valves. /forums/images/graemlins/frown.gif /forums/images/graemlins/grin.gif

 

[BobRip]

Re: Maybe a Step \'Backwards\', But Handy?

This is getting complicated. I will try to think of another way.

If I use a bladder I would have to valve it out for normal operation. This would take an additional valve. Is a bladder a commercial device?

Has anyone got some suggestions?

Bob Rip

 

[BobRip]

Re: Maybe a Step \'Backwards\', But Handy?

This is getting complicated. I will try to think of another way.

If I use a bladder I would have to valve it out for normal operation. This would take an additional valve. Is a bladder a commercial device?

Has anyone got some suggestions?

Bob Rip

 

[Spiffy]

Re: Maybe a Step \'Backwards\', But Handy?

<font color="blue"> Has anyone got some suggestions?
</font>

Doubt any are too much simpler, but you did ask for suggestions not "good suggestions"... /forums/images/graemlins/grin.gif

How about a double rod cylinder? Displacements would be equal.

Bladders are made for Ag and off-road equipment, but I have no idea of pricing. The diaphram type here is probably even more appropriate than the bladder type here; but either is available in around a quart which should be fine.

Replace the cylinder with a heavy spring.

Mount a portable air tank on the lift arms; I wouldn't be surprised if 200 psi would be enough to actuate it. You could even still run the cylinder on oil/ and or charge it with oil, but in the latter case would need to pay close attention to the pressure when you recharge it.

Did I mention adding a valve bank? /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif

 

[Spiffy]

Re: Maybe a Step \'Backwards\', But Handy?

<font color="blue"> Has anyone got some suggestions?
</font>

Doubt any are too much simpler, but you did ask for suggestions not "good suggestions"... /forums/images/graemlins/grin.gif

How about a double rod cylinder? Displacements would be equal.

Bladders are made for Ag and off-road equipment, but I have no idea of pricing. The diaphram type here is probably even more appropriate than the bladder type here; but either is available in around a quart which should be fine.

Replace the cylinder with a heavy spring.

Mount a portable air tank on the lift arms; I wouldn't be surprised if 200 psi would be enough to actuate it. You could even still run the cylinder on oil/ and or charge it with oil, but in the latter case would need to pay close attention to the pressure when you recharge it.

Did I mention adding a valve bank? /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif /forums/images/graemlins/grin.gif

 

[J_J]

Re: Maybe a Step \'Backwards\', But Handy?

A motor spool valve is designed to allow a motor to coast to a stop when the valve is in neutral, therefore the pressure would bleed off to the tank. You never want to stop a running motor by using a closed center valve. The dynamic forces on that motor might build up enough pressure to blow the lines, fittings or whatever. If that spool valve is used on a cylinder, the cylinder will bleed down and loose all pressure, maybe causing a bucket or arm to drop.

What kind of hydraulic circuit are you using the spool valve?

 

[J_J]

Re: Maybe a Step \'Backwards\', But Handy?

A motor spool valve is designed to allow a motor to coast to a stop when the valve is in neutral, therefore the pressure would bleed off to the tank. You never want to stop a running motor by using a closed center valve. The dynamic forces on that motor might build up enough pressure to blow the lines, fittings or whatever. If that spool valve is used on a cylinder, the cylinder will bleed down and loose all pressure, maybe causing a bucket or arm to drop.

What kind of hydraulic circuit are you using the spool valve?

 

[J_J]

Re: Maybe a Step \'Backwards\', But Handy?

An accumulator is designed to hold pressure and absorb some of the shock effects of hydraulic circuits. You want to be careful when using these in a circuit. Even with the engine and pump off, and you activate one of the valves, you will have full pressure until the accumulator is empty.

 

[J_J]

Re: Maybe a Step \'Backwards\', But Handy?

An accumulator is designed to hold pressure and absorb some of the shock effects of hydraulic circuits. You want to be careful when using these in a circuit. Even with the engine and pump off, and you activate one of the valves, you will have full pressure until the accumulator is empty.