Summit Monoblock Directional Control Valve

[mechtheist]

I want to add an hydraulic top link to my 3520 and I'm thinking I can use the backhoe hydraulics lines. I've seen a lot of diverter valve/multiplier options but this thing looks like it would do just fine and it's only $109. I've tried searching and don't see it mentioned so am I missing something? The info:

Monoblock Hydraulic Directional Control Valve, 2 Spool, 11 GPM

SKU: P402-2A1

This manual monoblock valve is a hydraulic directional control valve. These valves are used to start and stop fluid flow into hydraulic cylinders or hydraulic motors.

Common Uses: ​

• Operate hydraulic cylinders (Double-Acting or Single-Acting)
• Operate hydraulic motors (“D” Spool Required)
• Install rear remotes on a tractor

Benefits:​

• 2 Spool valve with compact design allows for installations in tight areas
• All spools are standard double acting with spring return to neutral position which are ideal for double acting cylinders
• Used for open center systems (Pump to Tank Flow) – closed center option available
• Anti-drop load checks on each spool
• Precision ground and hard chrome-plated spools assure a long life
• High-tensile strength cast iron monoblock construction
• SAE O-Ring ports ensure solid seal and prevent blockages
• Capable of closed center or Power Beyond (conversion plug required)
• Vertical or horizontal handle mount
• Adjustable Relief Valve Range: 1500 to 3625 PSI
• Preset Pressure Relief: 2610 PSI
• Used as motor or single-acting spool possible (#8 SAE port plug required)

Features:​

• Max Operating Pressure: P = 3625 PSI, T = 725 PSI, A & B = 4350 PSI
• Flow Rating: 11 GPM (40 l/min)
• A & B Work Ports: #8 SAE O-Ring (3/4”-16) Thread
• Inlet Port: #10 SAE O-Ring (7/8”-14) Thread
• Outlet Port: #10 SAE O-Ring (7/8”-14) Thread
• 2 – 5/16” Mounting Holes

If I understand it, you could hook it up either with the backhoe lines permanently hooked up or with them temporarily connected depending on whether you use the power-beyond option. Is this viable? I realize there will be connector/adapter issues but that's solvable. If it's this easy, I wonder why it doesn't seem to be mentioned here, which is why I think I'm missing something. Thanks for any help.

 

[K5lwq]

I am guessing that your backhoe is plumbed off of the loader valve power beyond. If that is the case, then I would simply put this valve after the loader valve and before the backhoe.

Get the power beyond conversion plug and use it to feed the backhoe.

 

[ptsg]

That valve will work just fine. May not be very ergonomic compared to the factory remote setup but that also depends how you're going to mount it.

For your application, might be worth to spend a couple more bucks and get one of the spools with detent. Then you can run the backhoe right of the valve and just use the detent to keep the lever engaged, instead of a bungee rope or something.

 

[RickB]

That valve will work just fine. May not be very ergonomic compared to the factory remote setup but that also depends how you're going to mount it.

For your application, might be worth to spend a couple more bucks and get one of the spools with detent. Then you can run the backhoe right of the valve and just use the detent to keep the lever engaged, instead of a bungee rope or something.

A detent with pressure kick out will be problematic powering a backhoe. Every time a cylinder reaches the end of its stroke the detent will release. Non-cancelling detents are rare on open center valve and potentially hazardous to gear pumps. That's why bungees or a mechanical means to lock the spool are so often seen and used.

 

[ptsg]

A detent with pressure kick out will be problematic powering a backhoe. Every time a cylinder reaches the end of its stroke the detent will release. Non-cancelling detents are rare on open center valve and potentially hazardous to gear pumps. That's why bungees or a mechanical means to lock the spool are so often seen and used.

Yes, I'm aware of that, however, the valve the OP showed, it's actually a Badestnost valve, just rebranded to something else and those are available all over the place on this side of the pond. Those valves have non-cancelling detents. A mechanical lock or a bungee cord can also be problematic if the OP doesn't take it off, just like the detent.

 

[RickB]

Yes, I'm aware of that, however, the valve the OP showed, it's actually a Badestnost valve, just rebranded to something else and those are available all over the place on this side of the pond. Those valves have non-cancelling detents. A mechanical lock or a bungee cord can also be problematic if the OP doesn't take it off, just like the detent.

Absolutely. My post was directed to the OP in an effort for him to understand a typical kick out detent wouldn't be a satisfactory choice to power a backhoe or anything with an additional valve.
Folks post here frequently complaining of poor results from that strategy.

 

[mechtheist]

Thanks for your replies. My thinking was to just use the backhoe feed and disconnect it and connect the backhoe if I'm using it. This is a diagram on Summit's site, I think it's more or less what y'all are talking about. Does it matter where the flow is coming from? I have virtually zero hydraulics knowhow. What's the difference between coming directly from the pump and going to the loader valve and from its power beyond port? My [ignorant] thinking here would be if you used the power beyond on this, it would be as if the two hoses together as you have to do when the backhoe is off. I don't understand the problem with the loader valves if that is where the backhoe line comes from.

 

[RickB]

That will work exactly as shown so long as the Summit valve gpm rating is sufficient to carry 100% of your tractor's hydraulic flow for the loader circuit.

 

[mechtheist]

It's rated at 11gpm, the 3520 is 9.

 

[ericm979]

The tank port on this valve is rated for 725 psi. Your tractor goes to about 2500. If you plumb the tank port into the 3pt (which is what you'd do if you put it in the BH loop) you'll damage the valve the first time you pick up something heavy on the 3pt.

You need to get it with a PB port and run that to the 3pt and tee the tank into the tank line from the loader. I'll second @ptsg's suggestion to get a valve with a detent on one spool to run the BH off of. Then you can get rid of the BH loop sticking out the back. I'll also suggest that you get a valve with a spool that goes into float. It can be useful for some implements.

I have two factory valves and a dealer installed 3rd valve on the fender. I moved the lever to point forwards instead of up and it's very easy to use that way. This valve would let you do the same.