Need advice on proper name for a flow reversing spool valve

[DanBmech]

Hello I am trying to identify if a certain type of hydraulic spool valve exists and what the proper name for it would be. So far on my internet searches I have not been able to find what I am looking for. I am looking for a 24V two position solenoid actuated spool valve block that has 3/4 " NPT or 1" NPT or equivalent machine thread ports. It needs to be acceptable for 3000 psi hydraulic service. It needs to have 4 ports. Port A = pressure supply, Port B =Tool fwd flow , Port C =Tool reverse flow, Port D = drain to hyd sump. With this spoolvalve unactuated flows A to B tool spins fwd tool discharges to port C which is connected to D = drains to sump. Then when spool valve solenoid is actuated Port A connected to C tool spins reverse, tool discharges to port B connected to D drain to sump.
Summary Unactuated A to B, C to D. Actuated A to C, B to D

I have tried flow reversing spool valve, cross flow valve, several other ideas with no luck. Any ideas if such valve is available. Thanks, Dan

 

[MikeHalloran]

That's usually called a directional valve.


Mike Halloran
Pembroke Pines, FL, USA

 

[hydtools]

I would add 'two position' to the description. 4 way, 2 position directional valve.

Ted

 

[DanBmech]

Mike and Ted, Thank you both for the replies. Its amazing when you know the proper name for a valve how much more information is available. A 4 way, 2 position hydraulic directional valve is indeed what I am looking for. I see that Northern hydraulics has them with 1/2" NPT ports that are rated for 26 GPM. The excavator I plan on mounting this is rated 54 GPM and the hydraulic screw woodsplitter requires 44 GPM so I figure the valve should be rated 50 GPM min. So I am still searching for a reasonably priced valve hopefully available with a 24V solenoid which is the power voltage on the excavator. Thank you again for your help. I'll post when I find the appropriate valve. Thanks, Dan

 

[MikeHalloran]

Just match the port sizes.
The GPM rating may be misleading.


Mike Halloran
Pembroke Pines, FL, USA

 

[HPost]

Mike's advice is more of a "rule of thumb" approach. If you really want to get the sizing right, check the performance curve of the valve.

The valve data will tell you what pressure drop you get for your flow rate.

You will be well advised to check the pressure losses, then you won't be back here in a few weeks/months asking why you don't have enough power to run the system.

 

[DanBmech]

Understood. Most all of the larger valves I am finding are made to be mounted on a manifold block and ports sealed with face seal O-rings. I am trying to find a valve that will have 3/4" or 1" NPT threaded ports to allow it to be plumbed easily to the hydraulic lines on the machine. If I can find a valve with threaded ports I can then check the flow curve and capacity stats for the valve and make sure it is not limiting flow. Thanks, Dan

 

[hydtools]

The flow rating of a valve is at some chosen pressure drop across the valve. Find out what that is. Then decide if your system can still function as you want it to with that pressure drop. Know that the pressure drop will increase with the square of the flow increase. You can always adapt straight thread o-ring ports to pipe, if you really want pipe connections.

Ted

 

[HPost]

Most spool valves that are commercially available and not too expensive will be manifold mounted. There are base plates available that will allow you to connect the pipes as required, then mount the valve on the plate.

Coils are available for most valves with 24 volt coils.

 

[DanBmech]

Any suggestions on brands or suppliers that would suit this application?

 

[HPost]

Eaton
Parker Hannifin
Bosch Rexroth
Danfoss
Husco
Hydro Control
Plus others...

 

[DanBmech]

OK, thanks, I had reviewed some Rexroth and Parker valves that seemed like they would suit the application but they were flush mount type that needed a manifold block and then I was having trouble finding manifold blocks that were single valve and fit the valve mounting and porting. I was hoping to find a clearly described stand alone valve advertised on the internet that I could purchase. Similar valves of smaller capacity are advertised by Northern Hydraulics but not big enough. I will keep looking or get in touch with a hydraulics vendor.

 

[HPost]

Check this...as an example

http://www.eaton.com/ecm/groups/public/@pub/@eaton/@hyd/documents/content/pll_1979.pdf

 

[DanBmech]

Wow, that is a lot of information, this will take me some time to review and absorb. Thanks!