Flow Control

[binaryviking]

Hello All

The left/right swing on my new backhoe attachment is way to fast, everything else works fine.
I was considering getting this adjustable flow control valve and putting it in right where the hydraulic hose hooks up to the controls for my swing , and then attaching the hydraulic host to it.
I'm thinking this will let me control the speed of my swing speed. I don't know all that much about hydraulics so I thought Id make a post to see if there might be anything I'm missing here.
Thanks for your help in advance!

 

[ptsg]

Yes, that will do exactly what you need.

You just need to check the specs on the flow control valve you choose. Some will adjust the flow in both directions, meaning you only need one, while others will adjust only on one direction and provide full flow on the opposite direction, meaning you need two valves but allows for flow settings this way.

Ideally, you want two flow control valves regardless. This will provide full flow control on the return side of both hoses and the momentum of the boom won't "run away" compared to have a single flow control valve.

 

[binaryviking]

Yes, that will do exactly what you need.

You just need to check the specs on the flow control valve you choose. Some will adjust the flow in both directions, meaning you only need one, while others will adjust only on one direction and provide full flow on the opposite direction, meaning you need two valves but allows for flow settings this way.

Ideally, you want two flow control valves regardless. This will provide full flow control on the return side of both hoses and the momentum of the boom won't "run away" compared to have a single flow control valve.

Thanks, that's some great information. So you are saying I should have 2 control valves placed like the picture below?
Also , here are the specs on the valve, I believe my backhoe is max 2000 psi and 5-6 GPM

• Needle Valve used to provide flow control and shut-off in either direction.
• Max Flow Rating: 22.5 GPM (85 L/Min)
• Max Pressure Rating: 5000 PSI

 

[ptsg]

Yes, one in each hose. That's a good spot, but it may get a bit tight really fast. You may have to put those on the T fitting near the cylinders instead, at the cost of being a bit harder to adjust.

22.5 GPM is an huge valve though. You can get something a lot smaller and cheaper.

Something like this: 3/8 NPT 8 GPM Prince WFC-600 In-Line Flow Control | Wolverine by Prince Mfg | Brands | www.surpluscenter.com

You'll have to figure out what size and type of fittings you have there. To me, looks like 3/8" BSPP but I won't confirm this 100%.

 

[binaryviking]

Yes, one in each hose. That's a good spot, but it may get a bit tight really fast. You may have to put those on the T fitting near the cylinders instead, at the cost of being a bit harder to adjust.

22.5 GPM is an huge valve though. You can get something a lot smaller and cheaper.

Something like this: 3/8 NPT 8 GPM Prince WFC-600 In-Line Flow Control | Wolverine by Prince Mfg | Brands | www.surpluscenter.com

You'll have to figure out what size and type of fittings you have there. To me, looks like 3/8" BSPP but I won't confirm this 100%.

So from what I was told by the guys at the tractor shop when I brought my hydraulic hose to them is the the hose fittings were "5-JIC" and after some more research and talking with Granger Supply they told me I needed a control valve with 1/2" NPT ports. I was going to get it from them but there valves were like $200-$300, whew!

 

[ptsg]

So from what I was told by the guys at the tractor shop when I brought my hydraulic hose to them is the the hose fittings were "5-JIC" and after some more research and talking with Granger Supply they told me I needed a control valve with 1/2" NPT ports. I was going to get it from them but there valves were like $200-$300, whew!

1/2" is way too big for a 6 GPM flow. Technically you can even go to the smaller one at 1/4", it will only help reduce the speed.

Definitely try to confirm what kind and size of fittings you have, so you can get the right stuff.

What make and model of tractor are we talking about? EDIT: Just saw your other thread. It's the BH8600 backhoe with it's own pump and tank, right?

 

[binaryviking]

So I have a 68 Massey Ferguson 150 that has a 3cylnder diesel . and I bought a BH8600 backhoe attachment for it. It came with a PTO pump. I let the the company I bought it from know about the swing problem and they said the only solution was for them to send me a smaller PTO pump which I really don't want to do because all of the other controls work fine. But the Swing is dangerously fast, even when I keep my Idle below 800 rpm.
I can make the swing slow if I'm very very careful with how much pressure I put on it but I don't want to have to do that each time.

 

[ptsg]

It makes totally sense. I built my own excavator and the swing is indeed a tricky geometry to get right and often results in being too fast.

Checking the specs, you can indeed go with the smaller 1/4" flow control valves. Should make it easier to fit where it needs to go. 1/4 NPT 5 GPM Prince WFC-400 In-Line Flow Control | Wolverine by Prince Mfg | Brands | www.surpluscenter.com

 

[DJ54]

Learning to feather the controls, and doing multiple functions at the same time will slow it down. It's a learning curve, and seat time is the only way to learn.

 

[binaryviking]

It makes totally sense. I built my own excavator and the swing is indeed a tricky geometry to get right and often results in being too fast.

Checking the specs, you can indeed go with the smaller 1/4" flow control valves. Should make it easier to fit where it needs to go. 1/4 NPT 5 GPM Prince WFC-400 In-Line Flow Control | Wolverine by Prince Mfg | Brands | www.surpluscenter.com