Does anyone here have a machine that has the overpressure relief valves set to pop off way lower than the rated 12.5 tons per ram? Mine start relieving pressure at around 8tons or so, making it so I can’t use more than 16 tons of force. Has anyone else run into this?
@langmuir-sam any thoughts here or a procedure to recalibrate the overpressure relief valves so they’re right at 12.5 tons per ram or just the tiniest grunt above that so the machine can deliver the full 25 ton rated press capacity?
We send them out a little under calibrated. Just for safety/reliability reasons - our lead engineer calculated that setting would get you to 25 tons, and even though it does not do it in practice, I haven’t been able to change the production aspect. It’s just good to have multiple layers of safety stops for anything high pressure. If you want to get your Titan 25T Press brake up from ~20 tons max to 25 tons, you can follow the guide below.
Pressure Relief Valve Calibration Increase
There are three parts to the PRV (Pressure Relief Valve):
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The upper valve body - a part that can rotate and the position of which determines the pressure calibration.
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The Jam nut - a nut that tightens upwards and holds the upper valve body in its calibrated position.
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The base 1" nut that is used to screw the part into the pump.
To tune up your PRV if you have experienced a low-tonnage relief failure and don’t know what exact tonnage it failed at, you will want to loosen the jam nut downwards slightly, turn the upper valve body about 90 degrees tighter clockwise, and then tighten the jam nut upwards to secure the assembly again.
If your upper valve body and base 1" do not have a sharpie mark showing their default alignment, I would add one before working to tighten it up. That way you can keep track of how far you have tightened the valve past the pre-calibrated position. DO NOT TUNE YOUR VALVE MORE THAN 180 DEGREES PAST THE PRE-CALIBRATED VALUE WITHOUT CONTACTING THE SUPPORT STAFF FIRST.
You will also want to bleed your machine before you run another high-tonnage bend like that. https://www.langmuirsystems.com/titan25t/assembly#titan25t-manual-19
On your next bends, take a video of the live report window so you can watch what is happening to the tonnage and ram positions. Especially on your first 90 degree tuneup. That way if your first 90 degree tuneup fails, you will be able to keep track of how much the pressure limit was raised by that 90 degree twist. You will generally want to make a 20 degree twist for each ton you are short.
Lowering the bend speed to 1 IPM for an extremely high tonnage bend will help, especially on the initial calibration after your first PRV adjustment. It will make spotting the high tonnage point on your post-calibration bend easier. It will also reduce the force required to make the bend.
Sam I would like a bit of clarification why we need to put Teflon tape between the PRV and the Lock nut. to mitigate HYD fluid weeping , It is not pipe threads for a lock/jam nut so so is there an o-ring failure or something marginal with these PRValves and tape is a quick fix? You talked with my son Alex about this yesterday. Seems any pressure adj. backing off lock nut will marginalize the Teflon tape hack and may need another attempt there potentially. Can you share the PN Mfgr. so we can see the internals or see their data on the PRV. Ken in NC
