General Question About Pneumatics

[MrForbes]

The relieve should be near the compressor, it can be connected to a T fitting along with the pressure switch, or screwed into the other side of the compressor (it has two output ports)

[EricH]

Originally Posted by squirrel

The relieve should be near the compressor, it can be connected to a T fitting along with the pressure switch, or screwed into the other side of the compressor (it has two output ports)

Squirrel, the 125 psi relief (the one with a cork protecting one end) goes in one of those. That leaves you only one port open.

<R95> Teams are not allowed to adjust the 125-psi relief valve. The valve has been calibrated prior to shipping. The relief valve must be attached to the compressor. If the compressor is not used on the ROBOT, then an additional relief valve must be obtained and included in the primary pneumatic circuit on the ROBOT (see Rule <R91>).

[itsme]

Umm.. A bit confused
Can I connect the relief valve right after the pressure switch in the circuit (as described in the pneumatics manual). And where do you mean the 2 output ports, on the compressor?
And what do you mean about the calibration? My team spin it a bit because we had air coming out from there (on low pressure, something like 20 PSI).
In the manual the relief valve isn't mentioned in the pneumatics sketches.
So is it or isn't it an obligation to put it in the circuit? (ErichH just mentioned that one output port of the compressor already has a relief valve, and I'm pretty sure my team didn't touch that relief valve).

By the way, the pressure switch is now working perfectly. On 115 PSI the compressor stops its action and starts again when pressure is under 95 PSI.

[EricH]

Originally Posted by itsme

Umm.. A bit confused
Can I connect the relieve valve right after the pressure switch in the circuit (as described in the pneumatics manual). And where do you mean the 2 output ports, on the compressor?
And what do you mean about the calibration? My team spin it a bit because we had air coming out from there (on low pressure, something like 20 PSI).

On the top of the compressor, there are two ports. The 125 psi relief goes into one of them. The manual relief could go almost anywhere in the system, as long as it completely drains it.

On the calibration, the 125 psi valve cannot be tampered with and remain legal. If air was leaking at low pressure, you should try teflon tape on the threads first, as that will help seal the threads.

[itsme]

We put teflon and now it's fine (just a tiny bit air running out, but not really significant). But if we screwed a bit the valve (the inner screw-nut) did it change the calibration?
If you say there is already a default relief valve on the compressor, is it a must to put another relief valve in the circuit?

[EricH]

Originally Posted by itsme

We put teflon and now it's fine (just a tiny bit air running out, but not really significant). But if we screwed a bit the valve (the inner screw-nut) did it change the calibration?
If you say there is already a default relief valve on the compressor, is it a must to put another relief valve in the circuit?

The one on the compressor is to ensure that you don't go over a safe pressure. The manual one (with that black valve) allows you to drain the air manually. You probably want that on so you don't have to run a cylinder multiple times to drain the system.


I honestly don't know about the 125 psi valve.

[itsme]

Yeah, I already put that manual valve (I connected a circuit almost identical to the one in the manual)

But what about the so called relief valve on the KOP checklist?

[EricH]

Originally Posted by itsme

Ohhh you meant the regulator?
I put the regulator and calibrated it to be at maximum of 60 PSI (as said in the rules).
I'm talking about the relief valve (the one with the blue spring inside it).

EDIT

Or did you mean the black manual valve?

And what about the so called relief valve on the KOP checklist?

The "relief valve" from the checklist is the one that you cannot change. It must go on the compressor. <R95>.

The black manual valve also must be in the system.

<R97> The Parker pressure vent valve must be connected to the pneumatic circuit such that, when manually operated, it will vent to the atmosphere to relieve all stored pressure. The valve must be placed on the ROBOT so that it is visible and easily accessible.

I don't know which relief valve has a blue spring inside it. Might be one of the regulators or gauges.

[itsme]

Originally Posted by EricH

The "relief valve" from the checklist is the one that you cannot change. It must go on the compressor. <R95>.

So if I screwed a bit the inner nut-screw did it change it?
What should I do to change it back??

[EricH]

Originally Posted by itsme

So if I screwed a bit the inner nut-screw did it change it?
What should I do to change it back??

I don't know the answer to either question.

[haroony341]

what are the exact rules on amount of pressure the system can have. i was going through the robot rules and i found we can have a limit of 120psi, but in the pneumatics manual its says the regulator has a limit of 60 psi.
is it 120 psi in the tanks and only 60psi elsewhere?
how does that work?

[MrForbes]

That is correct. You have the compressor, pressure switch, tanks, relief valve, high side pressure gage, and manual release valve all connected together before the regulator. This part of the system is at 120 psi maximum.

After the regulator, you have the second pressure gage, the solenoid valves, and the pneumatic cylinders (and the second pressure regulator if you so desire). This part of the system is at 60 psi maximum.