Chief Delphi - Adjustable pressure relief valve?

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Re: Adjustable pressure relief valve?

Gary,
I have no direction thus far from the GDC on how they intend inspections to be carried out on this rules change. Any discussion is only in the preliminary stage at this point and when a firm decision has been made, a Team Update should be generated so we all know. My concern is that the robot is safe and won't harm any students, mentors or passersby and that inspections won't take hours per robot.

Re: Adjustable pressure relief valve?

Thanks Al - I was just wondering if you had any discussions or thoughts yet (it's obviously fresh off the press). I think I'll post a Q&A and see if I can get a formal answer.

Re: Adjustable pressure relief valve?

Quote:

Originally Posted by ayeckley (Post 908406)

A burst disk is a completely different type of pressure relief device than what we're discussing. It's not really a valve. It's a membrane (usually metallic) that is designed to rupture at a precise pressure (although in practice there can be a large range of variability between discs) and allow the working fluid to pass, reducing the entrained pressure of the rest of the system. Once the disk bursts, it has to be replaced in order to seal the system again.

A relief valve will [theoretically] re-seat and re-seal once the pressure has been adequately relieved. In practice, there are usually some interesting dynamics that occur when a relief valve opens. If improperly selected, they can actually hammer themselves apart as a result. Often, they don't seal fully again once unseated. When you throw combustible cryogenic fluids into the mix, things can get even more exciting (not applicable to FRC).

okay, i had assumed they were essentially the same thing. since we've always had to relace relief valves that go off.

Re: Adjustable pressure relief valve?

Quote:

Originally Posted by ebarker (Post 908248)

An example of this relief valve is the E292 here

EDIT: I'd order the E291 valve, it is rated 0 to 125 psi and has a 1/8 NPT fitting.