Need to drop pressure

[bones1]

I have a 2500 psi pump that I need to drop pressure to about 500 lbs.What type of valve would I use to do this.Flow control, regulator or some kind of restrictor.I will be putting a gauge on the pump to check the output pressure.Thanks in advance.

 

[Wayne County Hose]

Your pump is rated for 2500 psi, but the actual psi will be determined by the amount of resistance between the pump and the tank, thru the pressure side of course.

You can look here- Baileynet.com: Main Page. Check page 57. You will need to pay attention to gpm. I'm sure many other places have relief valves as well.

Just wondering, why 500 psi?

 

[dynasim]

I think that you need a relief valve tee'ed into the system(or to change the set pressure of the relief valve on the tractor).

Chris

Edit: I misread your post. I thought you wanted to drop the pressure 500 psi, not to 500 psi. I would suggest installing the pressure relief on the cyclinder itself. The plumbing is easy, and the valves cheap.

 

[bones1]

Man you're quick Andy.If you remember this post http://www.tractorbynet.com/forums/hydraulics/110654-cylinder-id.html
I have been told by local (experts) that these are low pressure cylinders.If I hook up directly to the "low pressure " cylinders will they be getting 2500psi or only under a heavy load?.I just figured(probably wrong) that giving them a steady 500 or so psi would be better.I also am having trouble finding fittings that will fit the cylinders so I can even test them.The ones on the cylinders are brass and look to be 1/8 pipe where they screw into the cyl body but all the 1/8 pipe I have and bought will not thread in...just a little too big by a hair.Metric.British?????.

 

[Wayne County Hose]

Ahhh yes. Please excuse me. I have 2 brain cells left and some days, they refuse to speak to each other. Today, well, you know.

Yes, you are better off with a pressure relief. If you extend or retract the cylinders all the way, they will draw max. psi until old faithful erupts all over your trailer. You may be able to adjust pressure relief on the pump unit. I'll go back and see if it lists what you are using.

Can you measure the fittings that came out of the cylinder? I need diameter, just like measuring a bolt, and threads per inch and I can tell you what you have. Oh, and if the thread is tapered like pipe thread or parallel like on a bolt.

 

[Wayne County Hose]

Go here- Eaton Product Literature Library > Fluid Conveyance > Weatherhead
Then go to "How to identify fluid ports and connectors." Print that out and guard it with your life. This is the same info hose and fitting distributors use to identify fittings. But, measure them up and I'll tell you what you have.

British pipe would screw in there, would just mess up the threads if you went too far. Metric port has a bonded seal (o-ring with a small metal washer). I'm thinking pipe thread or inverted flare.

 

[AndyinIowa]

If this is a gear pump, you need a relief valve that is rated for the full flow of the pump.

If you need to operate SOME functions at 2500psi, and others at 500psi, you'll need a pressure reducing valve for the low pressure circuit.



AndyinIowa

 

[bones1]

Hi Andy's.Here is a link to the pump.
Washburn Company & hayspear.com JSB Barnes 12 volt Hydraulic pickup hay bale spear pump Andy #1 ,I'll go measure the fittings, I've got thread gauges somewhere around here.

 

[bones1]

Measurements
1. Fitting that came with cyl reads OD .396 at widest dimension of thread.
Thread gauge reads 28 @.0464
2. All other 1/8 pipe I gave reads OD.406 at the widest point.
Thread gauge reads 27 @.0481

 

[Wayne County Hose]

Looks like you have BSPT, British stantard tapered pipe. That's if there is no bonded seal. If it does have a bonded seal, it's BSPP, British standard parallel pipe. British pipe is very very close to national pipe. british pipe is usually 1 thread per inch finer and the threads are cut on a different angle, I think 55 degrees and npt is 60 degrees, one or the other.

I would install a port adaptor out to JIC for ease of plumbing. Try a good local shop or one of the online places. I don't believe I just said that.