SpudFiles

I recently purchased several of these pop-off valves from McMaster.
Their part number is 50265K23 and priced at $4.12 USD

http://www.mcmaster.com/#50265k23/=2vcb8a

The valve is made by Control Devices Inc part number NC25.
http://www.cdivalve.com/products/noncode/noncode.htm

The valve can be course adjusted for 4 pressure ranges by changing the included springs.

Yellow is for: 25 to 51 psi
Red is for: 51 to 100 psi
Silver is for: 101 to 150
Blue is for: 151 to 200 psi

Fine adjustment is done with the adjustment screw and locked with a jam nut when desired pressure is acquired.

The flow rateis 80 CFM

The price from McMaster is actually cheaper by a range of $2 to $4 compared to other vendors.

I will follow up with actual pictures later and also will be creating a 3D CAD model of it.

Thanks dewey, I was looking at these just the other day for use in conjunction with a QEV.

IIRC, these are actually cheaper than the fixed pressure pop-off valves that McMaster sells.

Here are the pictures as I had promised.
This should give people an idea how they function and how they are assembled/disassembled.

dewey-1 wrote:I recently purchased several of these pop-off valves from McMaster.

Any indication as to what they will be used for, something automatic in the pipeline or just a safety feature?

JSR;

I purchased them to make 3D CAD models initially.

They may get used in the ASCO launcher to attempt an automatic
or semi-automatic 1.5 inch bore launcher.

I am curious to find out the duration time of the pop off.
In other words the open time from pressure relief to closure.

This duration time gives me some other potential ideas.

dewey-1 wrote:I am curious to find out the duration time of the pop off.
In other words the open time from pressure relief to closure.

It depends entirely on the rate at which the pressure in the chamber is increasing and what the chamber volume is.

jackssmirkingrevenge wrote:

dewey-1 wrote:I am curious to find out the duration time of the pop off.
In other words the open time from pressure relief to closure.

It depends entirely on the rate at which the pressure in the chamber is increasing and what the chamber volume is.

Exactly!

That is why I needed some to experiment with.
As you know I am more into low pressure launchers. 50 to 150 psi for low kinetic energy projectiles.

Sorry, I am not into the destructive damage type projectiles.


Even though as Tech has shown, how much damage a marsmellow can do!